{"id":20939,"date":"2026-06-05T23:33:46","date_gmt":"2026-06-05T23:33:46","guid":{"rendered":"https:\/\/coinstats.app\/blog\/?p=20939"},"modified":"2026-06-06T08:47:22","modified_gmt":"2026-06-06T08:47:22","slug":"crypto-wallet-api","status":"publish","type":"post","link":"https:\/\/coinstats.app\/blog\/crypto-wallet-api\/","title":{"rendered":"What Is a Crypto Wallet API? The Complete 2026 Guide"},"content":{"rendered":"\n<style>\n\/* ===== Article typography ===== *\/\n.cs-article{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;color:#1F2024;font-size:17px;line-height:1.75;}\n.cs-article h2{font-size:27px;line-height:1.25;font-weight:800;color:#15161F;margin:48px 0 14px 0;letter-spacing:-0.01em;}\n.cs-article h3{font-size:20px;line-height:1.3;font-weight:700;color:#15161F;margin:30px 0 10px 0;}\n.cs-article p{margin:0 0 18px 0;}\n.cs-article ul,.cs-article ol{margin:0 0 18px 0;padding-left:22px;line-height:1.7;}\n.cs-article li{margin:6px 0;}\n.cs-article a,.cs-article a:link,.cs-article a:visited,.cs-article a:hover,.cs-article a:active{color:#0E0E10!important;text-decoration:underline;}\n.cs-article strong{color:#15161F;}\n.cs-article code{font-family:'SF Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:0.9em;background:#F4F1EE;padding:1px 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+ in-flow) ===== *\/\n.cs-toc{background:#FFF9F5;border:1px solid #E8DFD7;border-radius:14px;padding:18px 22px;margin:0 0 32px 0;font-size:16.2px;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;}\n.cs-toc-title{font-size:13.2px;font-weight:800;letter-spacing:1.4px;text-transform:uppercase;color:#F355BD;margin-bottom:10px;}\n.cs-toc ol{margin:0;padding-left:20px;columns:2;column-gap:24px;line-height:1.7;}\n@media (max-width:560px){.cs-toc ol{columns:1;}}\n.cs-toc a{color:#1A1B2E;text-decoration:none;transition:color 0.15s ease;}\n.cs-toc a:hover,.cs-toc a:focus{color:#F355BD;text-decoration:underline;}\n\n\/* ===== Link underline override (beats theme #site-content rule) ===== *\/\n#site-content .cs-toc ol a{text-decoration:none!important;}\n#site-content .cs-toc ol a:hover,#site-content .cs-toc ol a:focus{text-decoration:underline!important;color:#F355BD!important;}\n#site-content .cs-toc-fixed ol a{text-decoration:none!important;}\n#site-content .cs-toc-fixed ol a:hover{text-decoration:none!important;color:#F355BD!important;}\n#site-content .cs-cta a{text-decoration:none!important;}\n\n\/* ===== FAQ ===== *\/\n\n\/* ===== Factor grid ===== *\/\n.cs-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:24px 0;}\n@media (max-width:560px){.cs-grid{grid-template-columns:1fr;}}\n.cs-card{background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;}\n.cs-card-h{display:flex;align-items:center;gap:8px;margin-bottom:8px;}\n.cs-card-h span.i{font-size:18px;}\n.cs-card-h span.t{font-size:15px;font-weight:700;color:#0E0E10;}\n.cs-card-b{font-size:13.5px;color:#1F2024;line-height:1.6;}\n\/* FAQ accordion: matches the canonical theme FAQ (whats-is-ethereum-api) *\/\n.cs-article details{background:#FFFFFF;border:1px solid #F0E5DC;border-radius:14px;margin:0 0 10px 0;overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;}\n.cs-article details[open]{background:#FFF9F5;border-color:#F355BD;}\n.cs-article details summary{position:relative;list-style:none;padding:18px 50px 18px 22px;font-size:16px;font-weight:700;color:#0E0E10;cursor:pointer;}\n.cs-article details summary::-webkit-details-marker{display:none;}\n.cs-article details summary::after{content:\"+\";position:absolute;right:22px;top:50%;transform:translateY(-50%);color:#F355BD;font-size:24px;font-weight:400;line-height:1;}\n.cs-article details[open] summary{color:#F355BD;}\n.cs-article details[open] summary::after{content:\"\\2212\";}\n.cs-article details>div{padding:0 22px 20px 22px;font-size:15px;line-height:1.7;color:#1F2024;}\n.cs-article details>div p{margin:0;}\n<\/style>\n\n<nav class=\"cs-toc-fixed\" aria-label=\"On this page\">\n  <div class=\"cs-toc-fixed-label\">On this page<\/div>\n  <ol>\n    <li><a href=\"#s1\">What a crypto wallet API is<\/a><\/li>\n    <li><a href=\"#s2\">Two meanings: data vs provisioning<\/a><\/li>\n    <li><a href=\"#s3\">What a wallet data API returns<\/a><\/li>\n    <li><a href=\"#s4\">Quick decision table<\/a><\/li>\n    <li><a href=\"#s5\">Multi-chain coverage<\/a><\/li>\n    <li><a href=\"#s6\">Real-world use cases<\/a><\/li>\n    <li><a href=\"#s7\">Anatomy of a call<\/a><\/li>\n    <li><a href=\"#s19\">Crypto wallet API in practice<\/a><\/li>\n    <li><a href=\"#s8\">Authentication and security<\/a><\/li>\n    <li><a href=\"#s9\">Rate limits and pricing<\/a><\/li>\n    <li><a href=\"#s10\">When it is the wrong tool<\/a><\/li>\n    <li><a href=\"#s11\">How to choose one<\/a><\/li>\n    <li><a href=\"#s12\">Common mistakes<\/a><\/li>\n    <li><a href=\"#s13\">Provider types and when they fit<\/a><\/li>\n    <li><a href=\"#s21\">Crypto wallet API providers<\/a><\/li>\n    <li><a href=\"#s14\">Your first wallet API call<\/a><\/li>\n    <li><a href=\"#s20\">Crypto wallet API examples<\/a><\/li>\n    <li><a href=\"#s15\">Best practices<\/a><\/li>\n    <li><a href=\"#s16\">Wallet APIs and AI agents<\/a><\/li>\n    <li><a href=\"#s17\">Integration checklist<\/a><\/li>\n    <li><a href=\"#s18\">FAQ<\/a><\/li>\n  <\/ol>\n<\/nav>\n\n<article class=\"cs-article\">\n\n<nav class=\"cs-toc\">\n  <div class=\"cs-toc-title\">In this guide<\/div>\n  <ol>\n    <li><a href=\"#s1\">What a crypto wallet API is<\/a><\/li>\n    <li><a href=\"#s2\">Two meanings: data vs provisioning<\/a><\/li>\n    <li><a href=\"#s3\">What a wallet data API returns<\/a><\/li>\n    <li><a href=\"#s4\">Quick decision table<\/a><\/li>\n    <li><a href=\"#s5\">Multi-chain coverage<\/a><\/li>\n    <li><a href=\"#s6\">Real-world use cases<\/a><\/li>\n    <li><a href=\"#s7\">Anatomy of a call<\/a><\/li>\n    <li><a href=\"#s19\">Crypto wallet API in practice<\/a><\/li>\n    <li><a href=\"#s8\">Authentication and security<\/a><\/li>\n    <li><a href=\"#s9\">Rate limits and pricing<\/a><\/li>\n    <li><a href=\"#s10\">When it is the wrong tool<\/a><\/li>\n    <li><a href=\"#s11\">How to choose one<\/a><\/li>\n    <li><a href=\"#s12\">Common mistakes<\/a><\/li>\n    <li><a href=\"#s13\">Provider types and when they fit<\/a><\/li>\n    <li><a href=\"#s21\">Crypto wallet API providers<\/a><\/li>\n    <li><a href=\"#s14\">Your first wallet API call<\/a><\/li>\n    <li><a href=\"#s20\">Crypto wallet API examples<\/a><\/li>\n    <li><a href=\"#s15\">Best practices<\/a><\/li>\n    <li><a href=\"#s16\">Wallet APIs and AI agents<\/a><\/li>\n    <li><a href=\"#s17\">Integration checklist<\/a><\/li>\n    <li><a href=\"#s18\">FAQ<\/a><\/li>\n  <\/ol>\n<\/nav>\n\n<p>You have a wallet address. You need to know what is inside it. Balances, tokens, past transactions, and open DeFi positions. A crypto wallet API turns that address into structured data. You send the address. You get JSON back.<\/p>\n\n<p>Doing this by hand is painful. Each blockchain speaks its own language. Each node returns raw, low-level data. A crypto wallet data API hides that work behind one endpoint. It reads the chain, normalizes the result, and returns clean fields.<\/p>\n\n<p>This guide explains what a crypto wallet API is. It covers how these APIs work and what they return. It also covers how to choose one and what to avoid. Still comparing data providers in general? Start with our <a href=\"https:\/\/coinstats.app\/blog\/best-crypto-api\/\">best crypto API guide<\/a>.<\/p>\n\n<p>Looking for wallet creation, seedless wallets, or signing? That is wallet-as-a-service. This guide covers read-only wallet data APIs.<\/p>\n\n<div style=\"background:#1A1B2E;border-radius:14px;padding:22px 26px;margin:32px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n  <div style=\"font-size:12px;font-weight:800;letter-spacing:1.4px;text-transform:uppercase;color:#F355BD;margin-bottom:10px;\">Who this guide is for<\/div>\n  <div style=\"color:#FFFFFF;font-size:14.5px;line-height:1.65;\">\n    Engineers and product teams adding wallet data to an app. Think portfolio trackers, tax tools, DeFi dashboards, and AI agents. No prior blockchain integration experience is needed.\n  <\/div>\n<\/div>\n\n<p>Read top to bottom for the full picture. In a hurry? Jump to the decision table in section 4. The sidebar on the right tracks your place.<\/p>\n\n<div style=\"background:#FFF9F5;border:2px solid #F355BD;border-radius:14px;padding:22px 26px;margin:32px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n  <div style=\"font-size:12px;font-weight:800;letter-spacing:1.4px;text-transform:uppercase;color:#F355BD;margin-bottom:10px;\">Key takeaways<\/div>\n  <ul style=\"margin:0;padding-left:20px;color:#0E0E10;font-size:14.5px;line-height:1.65;\">\n    <li>A crypto wallet API returns balances, transactions, and DeFi positions by address.<\/li>\n    <li>&#8220;Wallet API&#8221; means two things: reading wallet data, or creating wallets.<\/li>\n    <li>This guide focuses on the read side. It covers most use cases.<\/li>\n    <li>Multi-chain coverage matters more than any single feature.<\/li>\n    <li>Always filter spam tokens and cache wallet data sensibly.<\/li>\n    <li>CoinStats API is one example. It reads wallets across 120+ chains.<\/li>\n  <\/ul>\n<\/div>\n\n<h2 id=\"s1\">What a crypto wallet API is<\/h2>\n\n<p>A crypto wallet API is an HTTP endpoint that returns wallet data. You pass a public wallet address. The API reads the blockchain for you. It sends back balances, token holdings, and transaction history. Many also return DeFi positions and risk signals. A wallet API is one kind of <a href=\"https:\/\/coinstats.app\/blog\/what-is-crypto-blockchain-api-understanding-crypto-api-a-beginners-guide\/\">crypto API<\/a>.<\/p>\n\n<p>The address is public. Anyone can see what a wallet holds onchain. A wallet API does not need your private keys. It reads public state only. It never signs or moves funds.<\/p>\n\n<p>Think of it as a translator. Raw chain data is verbose and chain-specific. A crypto wallet data API normalizes it into clean JSON. Token amounts arrive in human units. Dollar values come attached. Spam tokens can be filtered out.<\/p>\n\n<svg viewBox=\"0 0 700 200\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"A wallet API turns one address into cross-chain balances, history, and positions\" style=\"width:100%;height:auto;max-width:700px;margin:24px auto;display:block;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n  <defs>\n    <linearGradient id=\"csAff1\" x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"0%\">\n      <stop offset=\"0%\" stop-color=\"#C238E8\"\/>\n      <stop offset=\"100%\" stop-color=\"#FF4F7C\"\/>\n    <\/linearGradient>\n    <marker id=\"arrowH\" viewBox=\"0 0 10 10\" refX=\"8\" refY=\"5\" markerWidth=\"6\" markerHeight=\"6\" orient=\"auto\"><path d=\"M 0 0 L 10 5 L 0 10 z\" fill=\"#A8A4B8\"\/><\/marker>\n  <\/defs>\n  <rect x=\"0\" y=\"0\" width=\"700\" height=\"200\" rx=\"14\" fill=\"#1A1B2E\"\/>\n  <text x=\"20\" y=\"32\" fill=\"#FFFFFF\" font-size=\"11\" font-weight=\"700\" letter-spacing=\"1.6\">ONE ADDRESS IN, EVERYTHING OUT<\/text>\n  <rect x=\"20\" y=\"76\" width=\"160\" height=\"56\" rx=\"10\" fill=\"#FFF9F5\"\/>\n  <text x=\"100\" y=\"100\" fill=\"#1A1B2E\" font-size=\"10\" font-weight=\"600\" text-anchor=\"middle\" letter-spacing=\"0.6\">WALLET ADDRESS<\/text>\n  <text x=\"100\" y=\"120\" fill=\"#888780\" font-size=\"11\" font-family=\"ui-monospace,SFMono-Regular,Menlo,monospace\" text-anchor=\"middle\">0x7a2b&#8230;9f1c<\/text>\n  <path d=\"M 190 104 L 250 104\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" fill=\"none\" marker-end=\"url(#arrowH)\"\/>\n  <rect x=\"260\" y=\"76\" width=\"160\" height=\"56\" rx=\"28\" fill=\"url(#csAff1)\"\/>\n  <text x=\"340\" y=\"98\" fill=\"#FFFFFF\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\" letter-spacing=\"0.6\">WALLET API<\/text>\n  <text x=\"340\" y=\"115\" fill=\"#FFFFFF\" font-size=\"10\" font-style=\"italic\" text-anchor=\"middle\" opacity=\"0.95\">resolves across chains<\/text>\n  <path d=\"M 430 104 L 490 104\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" fill=\"none\" marker-end=\"url(#arrowH)\"\/>\n  <rect x=\"500\" y=\"56\" width=\"180\" height=\"32\" rx=\"8\" fill=\"#FFF9F5\"\/>\n  <text x=\"590\" y=\"76\" fill=\"#1A1B2E\" font-size=\"11\" font-weight=\"600\" text-anchor=\"middle\">Cross-chain balances<\/text>\n  <rect x=\"500\" y=\"94\" width=\"180\" height=\"32\" rx=\"8\" fill=\"#FFF9F5\"\/>\n  <text x=\"590\" y=\"114\" fill=\"#1A1B2E\" font-size=\"11\" font-weight=\"600\" text-anchor=\"middle\">Transaction history<\/text>\n  <rect x=\"500\" y=\"132\" width=\"180\" height=\"32\" rx=\"8\" fill=\"#FFF9F5\"\/>\n  <text x=\"590\" y=\"152\" fill=\"#1A1B2E\" font-size=\"11\" font-weight=\"600\" text-anchor=\"middle\">DeFi positions, yield<\/text>\n<\/svg>\n\n<h3>How a wallet API works<\/h3>\n\n<p>The work happens in a few steps. Your app sends one HTTPS request with the address. An edge layer checks your API key. A backend queries the chains where that address is active. It merges the results and adds prices. Then it returns one JSON response.<\/p>\n\n<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 700 240\" width=\"100%\" style=\"max-width:700px;display:block;margin:24px auto;\">\n  <defs>\n    <linearGradient id=\"csAff2\" x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"0%\">\n      <stop offset=\"0%\" stop-color=\"#C238E8\"\/>\n      <stop offset=\"100%\" stop-color=\"#FF4F7C\"\/>\n    <\/linearGradient>\n  <\/defs>\n  <rect x=\"0\" y=\"0\" width=\"700\" height=\"240\" rx=\"14\" fill=\"#1A1B2E\"\/>\n  <text x=\"24\" y=\"32\" fill=\"#FFFFFF\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" font-weight=\"700\" letter-spacing=\"1.6\">REQUEST LIFECYCLE<\/text>\n  <g font-family=\"-apple-system, sans-serif\">\n    <rect x=\"24\" y=\"80\" width=\"96\" height=\"60\" rx=\"10\" fill=\"#FFF9F5\"\/>\n    <text x=\"72\" y=\"106\" fill=\"#1A1B2E\" font-size=\"12\" font-weight=\"700\" text-anchor=\"middle\">Your app<\/text>\n    <text x=\"72\" y=\"124\" fill=\"#888780\" font-size=\"10\" text-anchor=\"middle\">sends address<\/text>\n    <text x=\"72\" y=\"160\" fill=\"#A8A4B8\" font-size=\"10\" text-anchor=\"middle\">~0 ms<\/text>\n    <path d=\"M 124 110 L 144 110\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" fill=\"none\"\/>\n    <rect x=\"148\" y=\"80\" width=\"96\" height=\"60\" rx=\"10\" fill=\"#FFF9F5\"\/>\n    <text x=\"196\" y=\"106\" fill=\"#1A1B2E\" font-size=\"12\" font-weight=\"700\" text-anchor=\"middle\">HTTPS<\/text>\n    <text x=\"196\" y=\"124\" fill=\"#888780\" font-size=\"10\" text-anchor=\"middle\">TLS handshake<\/text>\n    <text x=\"196\" y=\"160\" fill=\"#A8A4B8\" font-size=\"10\" text-anchor=\"middle\">~40 ms<\/text>\n    <path d=\"M 248 110 L 268 110\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" fill=\"none\"\/>\n    <rect x=\"272\" y=\"80\" width=\"96\" height=\"60\" rx=\"10\" fill=\"#FFF9F5\"\/>\n    <text x=\"320\" y=\"106\" fill=\"#1A1B2E\" font-size=\"12\" font-weight=\"700\" text-anchor=\"middle\">Edge<\/text>\n    <text x=\"320\" y=\"124\" fill=\"#888780\" font-size=\"10\" text-anchor=\"middle\">auth + cache<\/text>\n    <text x=\"320\" y=\"160\" fill=\"#A8A4B8\" font-size=\"10\" text-anchor=\"middle\">~10 ms<\/text>\n    <path d=\"M 372 110 L 392 110\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" fill=\"none\"\/>\n    <rect x=\"396\" y=\"80\" width=\"96\" height=\"60\" rx=\"10\" fill=\"url(#csAff2)\"\/>\n    <text x=\"444\" y=\"106\" fill=\"#FFFFFF\" font-size=\"12\" font-weight=\"800\" text-anchor=\"middle\">Index<\/text>\n    <text x=\"444\" y=\"124\" fill=\"#FFFFFF\" font-size=\"10\" text-anchor=\"middle\" opacity=\"0.92\">query chains<\/text>\n    <text x=\"444\" y=\"160\" fill=\"#A8A4B8\" font-size=\"10\" text-anchor=\"middle\">~120 ms<\/text>\n    <path d=\"M 496 110 L 516 110\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" fill=\"none\"\/>\n    <rect x=\"520\" y=\"80\" width=\"80\" height=\"60\" rx=\"10\" fill=\"#FFF9F5\"\/>\n    <text x=\"560\" y=\"106\" fill=\"#1A1B2E\" font-size=\"12\" font-weight=\"700\" text-anchor=\"middle\">Normalize<\/text>\n    <text x=\"560\" y=\"124\" fill=\"#888780\" font-size=\"10\" text-anchor=\"middle\">merge + price<\/text>\n    <text x=\"560\" y=\"160\" fill=\"#A8A4B8\" font-size=\"10\" text-anchor=\"middle\">~25 ms<\/text>\n    <path d=\"M 604 110 L 624 110\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" fill=\"none\"\/>\n    <rect x=\"628\" y=\"80\" width=\"48\" height=\"60\" rx=\"10\" fill=\"#FFF9F5\"\/>\n    <text x=\"652\" y=\"114\" fill=\"#1A1B2E\" font-size=\"12\" font-weight=\"700\" text-anchor=\"middle\">JSON<\/text>\n    <text x=\"652\" y=\"160\" fill=\"#A8A4B8\" font-size=\"10\" text-anchor=\"middle\">~5 ms<\/text>\n  <\/g>\n  <text x=\"350\" y=\"212\" fill=\"#A8A4B8\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" text-anchor=\"middle\">Illustrative timings. Real latency varies by chain, cache, and region.<\/text>\n<\/svg>\n\n<p>You skip running nodes for every chain. You skip indexing raw logs. You skip mapping token contracts to symbols and decimals. The API does that work and keeps it current.<\/p>\n\n<h2 id=\"s2\">Two meanings: data vs provisioning<\/h2>\n\n<p>The phrase crypto wallet API is ambiguous. It points to two different products. Mixing them up wastes integration time. Here is the split.<\/p>\n\n<svg viewBox=\"0 0 740 360\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Wallet data API versus wallet provisioning API\" style=\"width:100%;height:auto;max-width:740px;margin:24px auto;display:block;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n  <defs>\n    <linearGradient id=\"csAff3\" x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"0%\">\n      <stop offset=\"0%\" stop-color=\"#C238E8\"\/>\n      <stop offset=\"100%\" stop-color=\"#FF4F7C\"\/>\n    <\/linearGradient>\n    <marker id=\"arAf3\" viewBox=\"0 0 10 10\" refX=\"8\" refY=\"5\" markerWidth=\"6\" markerHeight=\"6\" orient=\"auto\"><path d=\"M 0 0 L 10 5 L 0 10 z\" fill=\"#A8A4B8\"\/><\/marker>\n  <\/defs>\n  <rect x=\"0\" y=\"0\" width=\"740\" height=\"360\" rx=\"14\" fill=\"#1A1B2E\"\/>\n  <text x=\"370\" y=\"32\" fill=\"#FFFFFF\" font-size=\"11.5\" font-weight=\"700\" text-anchor=\"middle\" letter-spacing=\"0.4\">WHAT YOU NEED DECIDES WHICH ONE<\/text>\n  <rect x=\"270\" y=\"54\" width=\"200\" height=\"50\" rx=\"14\" fill=\"url(#csAff3)\"\/>\n  <text x=\"370\" y=\"78\" fill=\"#FFFFFF\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\" letter-spacing=\"0.5\">YOUR GOAL<\/text>\n  <text x=\"370\" y=\"94\" fill=\"#FFFFFF\" font-size=\"10\" font-style=\"italic\" text-anchor=\"middle\" opacity=\"0.95\">read data, or move funds<\/text>\n  <path d=\"M 330 104 Q 330 140 195 150\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" fill=\"none\" marker-end=\"url(#arAf3)\"\/>\n  <text x=\"242\" y=\"125\" fill=\"#FFFFFF\" font-size=\"11\" font-weight=\"800\" text-anchor=\"middle\">READ<\/text>\n  <path d=\"M 410 104 Q 410 140 545 150\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" fill=\"none\" marker-end=\"url(#arAf3)\"\/>\n  <text x=\"497\" y=\"125\" fill=\"#FFFFFF\" font-size=\"11\" font-weight=\"800\" text-anchor=\"middle\">WRITE<\/text>\n  <rect x=\"40\" y=\"160\" width=\"310\" height=\"175\" rx=\"12\" fill=\"#FFF9F5\"\/>\n  <text x=\"195\" y=\"186\" fill=\"#1A1B2E\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\" letter-spacing=\"0.5\">WALLET DATA API<\/text>\n  <circle cx=\"62\" cy=\"214\" r=\"3.5\" fill=\"#1A1B2E\"\/><text x=\"78\" y=\"218\" fill=\"#1A1B2E\" font-size=\"12\">Reads onchain wallet data<\/text>\n  <circle cx=\"62\" cy=\"238\" r=\"3.5\" fill=\"#1A1B2E\"\/><text x=\"78\" y=\"242\" fill=\"#1A1B2E\" font-size=\"12\">You send a public address<\/text>\n  <circle cx=\"62\" cy=\"262\" r=\"3.5\" fill=\"#1A1B2E\"\/><text x=\"78\" y=\"266\" fill=\"#1A1B2E\" font-size=\"12\">Returns balances and positions<\/text>\n  <circle cx=\"62\" cy=\"286\" r=\"3.5\" fill=\"#1A1B2E\"\/><text x=\"78\" y=\"290\" fill=\"#1A1B2E\" font-size=\"12\">For trackers, tax, AI agents<\/text>\n  <rect x=\"390\" y=\"160\" width=\"310\" height=\"175\" rx=\"12\" fill=\"#FFF9F5\"\/>\n  <text x=\"545\" y=\"186\" fill=\"#1A1B2E\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\" letter-spacing=\"0.5\">WALLET PROVISIONING API<\/text>\n  <circle cx=\"412\" cy=\"214\" r=\"3.5\" fill=\"#1A1B2E\"\/><text x=\"428\" y=\"218\" fill=\"#1A1B2E\" font-size=\"12\">Creates and controls wallets<\/text>\n  <circle cx=\"412\" cy=\"238\" r=\"3.5\" fill=\"#1A1B2E\"\/><text x=\"428\" y=\"242\" fill=\"#1A1B2E\" font-size=\"12\">You generate and store keys<\/text>\n  <circle cx=\"412\" cy=\"262\" r=\"3.5\" fill=\"#1A1B2E\"\/><text x=\"428\" y=\"266\" fill=\"#1A1B2E\" font-size=\"12\">Signs and broadcasts transactions<\/text>\n  <circle cx=\"412\" cy=\"286\" r=\"3.5\" fill=\"#1A1B2E\"\/><text x=\"428\" y=\"290\" fill=\"#1A1B2E\" font-size=\"12\">For custody, payments, signers<\/text>\n<\/svg>\n\n<p>A wallet data API is read-only. You give it an address. It returns what that wallet holds and did. It never holds keys. This is what most apps need first.<\/p>\n\n<p>A wallet provisioning API is different. It creates wallets and signs transactions. Some call this wallet-as-a-service. Searches like &#8220;no seed phrase&#8221; point here. Keys are generated and stored by the provider.<\/p>\n\n<p>This guide is about the data side. That means reading balances, positions, and history. Need to create wallets or sign? You want provisioning instead. The two are sometimes combined in one product.<\/p>\n\n<h2 id=\"s3\">What a wallet data API returns<\/h2>\n\n<p>A wallet data API bundles several read endpoints. Each answers a different question about an address. Here are the common ones.<\/p>\n\n<div class=\"cs-grid\">\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#128176;<\/span><span class=\"t\">Native balance<\/span><\/div>\n    <div class=\"cs-card-b\">The chain&#8217;s base asset, like ETH or SOL.<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#129689;<\/span><span class=\"t\">Token balances<\/span><\/div>\n    <div class=\"cs-card-b\">Every token an address holds. The crypto token balance API.<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#128220;<\/span><span class=\"t\">Transaction history<\/span><\/div>\n    <div class=\"cs-card-b\">Past transfers, swaps, and contract calls with timestamps.<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#127806;<\/span><span class=\"t\">DeFi positions<\/span><\/div>\n    <div class=\"cs-card-b\">Staked, lent, and LP assets, resolved per protocol.<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#128444;<\/span><span class=\"t\">NFT holdings<\/span><\/div>\n    <div class=\"cs-card-b\">Collectibles the address owns, with metadata.<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#128737;<\/span><span class=\"t\">Risk signals<\/span><\/div>\n    <div class=\"cs-card-b\">Flags on held tokens: honeypots, hidden fees, blacklists.<\/div>\n  <\/div>\n<\/div>\n\n<p>Names vary by provider. The holdings view is sometimes called a crypto token positions API. The DeFi view is a crypto wallet DeFi positions API. The mechanics stay the same. You query by address.<\/p>\n\n<p>Together these endpoints power a full portfolio view. Most apps start with balances and prices. They add transactions and DeFi later.<\/p>\n\n<p>Spam filtering and risk analysis are different things. Spam filtering hides dust and scam tokens from the view. Risk analysis checks contract behavior. Empty risk data does not mean safe. It can mean the token is not indexed.<\/p>\n\n<h2 id=\"s4\">Quick decision table<\/h2>\n\n<p>Short on time? Match your need to a starting point. This is often the easiest way in.<\/p>\n\n<div style=\"background:#1A1B2E;border-radius:14px;overflow:hidden;padding:0;margin:24px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n  <div style=\"overflow-x:auto;\">\n    <table style=\"border:none;width:100%;border-collapse:separate;border-spacing:0;font-size:13.5px;color:#FFFFFF;\">\n      <thead style=\"border:none;\"><tr style=\"border:none;\">\n        <th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg, #C238E8 0%, #E040B5 100%);\">I need to&#8230;<\/th>\n        <th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg, #E040B5 0%, #FF4F7C 100%);\">Start with<\/th>\n      <\/tr><\/thead>\n      <tbody style=\"border:none;\">\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Show a user&#8217;s total portfolio<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Wallet balances plus token prices<\/td><\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">List every token in a wallet<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">A crypto token balance API<\/td><\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Show DeFi positions<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">A wallet DeFi positions endpoint<\/td><\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Pull transaction history<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">A wallet transactions endpoint<\/td><\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Track many wallets at once<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Batch wallet reads plus caching<\/td><\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Flag risky tokens<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">A token risk endpoint<\/td><\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Create wallets for users<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">A provisioning API, not this guide<\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n<\/div>\n\n<h2 id=\"s5\">Multi-chain coverage<\/h2>\n\n<p>A wallet lives on one chain. A user rarely does. People hold assets across many chains at once. A good wallet API reads all of them from one address or key.<\/p>\n\n<p>EVM chains share an address format. One 0x address can hold assets on Ethereum, Base, and Arbitrum. Some APIs return every EVM chain in a single call. CoinStats API does this across <a href=\"https:\/\/coinstats.app\/api-docs\/wallet\/ethereum-evm\/\">24+ EVM chains<\/a>.<\/p>\n\n<svg viewBox=\"0 0 700 200\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"One address or xpub resolves across EVM chains, Solana, and Bitcoin\" style=\"width:100%;height:auto;max-width:700px;margin:24px auto;display:block;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n  <defs>\n    <linearGradient id=\"csAff5\" x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"0%\">\n      <stop offset=\"0%\" stop-color=\"#C238E8\"\/>\n      <stop offset=\"100%\" stop-color=\"#FF4F7C\"\/>\n    <\/linearGradient>\n    <marker id=\"arrowM\" viewBox=\"0 0 10 10\" refX=\"8\" refY=\"5\" markerWidth=\"6\" markerHeight=\"6\" orient=\"auto\"><path d=\"M 0 0 L 10 5 L 0 10 z\" fill=\"#A8A4B8\"\/><\/marker>\n  <\/defs>\n  <rect x=\"0\" y=\"0\" width=\"700\" height=\"200\" rx=\"14\" fill=\"#1A1B2E\"\/>\n  <text x=\"20\" y=\"32\" fill=\"#FFFFFF\" font-size=\"11\" font-weight=\"700\" letter-spacing=\"1.6\">ONE CALL, MANY CHAINS<\/text>\n  <rect x=\"20\" y=\"76\" width=\"160\" height=\"56\" rx=\"10\" fill=\"#FFF9F5\"\/>\n  <text x=\"100\" y=\"100\" fill=\"#1A1B2E\" font-size=\"10\" font-weight=\"600\" text-anchor=\"middle\" letter-spacing=\"0.6\">ADDRESS OR XPUB<\/text>\n  <text x=\"100\" y=\"120\" fill=\"#888780\" font-size=\"11\" font-family=\"ui-monospace,SFMono-Regular,Menlo,monospace\" text-anchor=\"middle\">0x7a2b&#8230; \/ zpub&#8230;<\/text>\n  <path d=\"M 190 104 L 250 104\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" fill=\"none\" marker-end=\"url(#arrowM)\"\/>\n  <rect x=\"260\" y=\"76\" width=\"160\" height=\"56\" rx=\"28\" fill=\"url(#csAff5)\"\/>\n  <text x=\"340\" y=\"98\" fill=\"#FFFFFF\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\" letter-spacing=\"0.6\">WALLET API<\/text>\n  <text x=\"340\" y=\"115\" fill=\"#FFFFFF\" font-size=\"10\" font-style=\"italic\" text-anchor=\"middle\" opacity=\"0.95\">resolves across chains<\/text>\n  <path d=\"M 430 104 L 490 104\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" fill=\"none\" marker-end=\"url(#arrowM)\"\/>\n  <rect x=\"500\" y=\"56\" width=\"180\" height=\"32\" rx=\"8\" fill=\"#FFF9F5\"\/>\n  <text x=\"590\" y=\"76\" fill=\"#1A1B2E\" font-size=\"11\" font-weight=\"600\" text-anchor=\"middle\">EVM chains (24+)<\/text>\n  <rect x=\"500\" y=\"94\" width=\"180\" height=\"32\" rx=\"8\" fill=\"#FFF9F5\"\/>\n  <text x=\"590\" y=\"114\" fill=\"#1A1B2E\" font-size=\"11\" font-weight=\"600\" text-anchor=\"middle\">Solana<\/text>\n  <rect x=\"500\" y=\"132\" width=\"180\" height=\"32\" rx=\"8\" fill=\"#FFF9F5\"\/>\n  <text x=\"590\" y=\"152\" fill=\"#1A1B2E\" font-size=\"11\" font-weight=\"600\" text-anchor=\"middle\">Bitcoin (xpub)<\/text>\n<\/svg>\n\n<p>Non-EVM chains differ. Solana uses its own address format. Bitcoin uses several. A wallet API should handle each one natively.<\/p>\n\n<h3>Bitcoin and extended public keys<\/h3>\n\n<p>Bitcoin works differently. One wallet derives many addresses. An extended public key covers them all. These are xpub, ypub, and zpub keys. A wallet API can expand them and sum the balances. CoinStats API supports xpub, ypub, and zpub derivation.<\/p>\n\n<p>One caution. An xpub cannot spend funds. It can still reveal a wallet&#8217;s derived addresses and history. Treat extended public keys as sensitive portfolio data.<\/p>\n\n<h2 id=\"s6\">Real-world use cases<\/h2>\n\n<p>The same endpoints power very different products. Here is how teams combine them. Each card lists the data it needs.<\/p>\n\n<div class=\"cs-grid\">\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#128202;<\/span><span class=\"t\">Portfolio tracker<\/span><\/div>\n    <div class=\"cs-card-b\">Show holdings and value across many wallets. <strong>Needs:<\/strong> balances, prices, DeFi positions.<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#129534;<\/span><span class=\"t\">Tax and accounting<\/span><\/div>\n    <div class=\"cs-card-b\">Reconstruct gains and losses from history. <strong>Needs:<\/strong> full transactions, timestamps, prices.<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#127806;<\/span><span class=\"t\">DeFi dashboard<\/span><\/div>\n    <div class=\"cs-card-b\">Show staked, lent, and LP positions. <strong>Needs:<\/strong> DeFi positions, protocol metadata.<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#129302;<\/span><span class=\"t\">AI portfolio agent<\/span><\/div>\n    <div class=\"cs-card-b\">Answer plain questions about a wallet. <strong>Needs:<\/strong> balances, positions, an MCP Server.<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#128737;<\/span><span class=\"t\">Wallet security check<\/span><\/div>\n    <div class=\"cs-card-b\">Warn users about risky holdings. <strong>Needs:<\/strong> token risk flags, approvals.<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#127970;<\/span><span class=\"t\">Treasury monitor<\/span><\/div>\n    <div class=\"cs-card-b\">Watch a company&#8217;s onchain funds. <strong>Needs:<\/strong> balances, transfers, alerts.<\/div>\n  <\/div>\n<\/div>\n\n<h2 id=\"s7\">Anatomy of a wallet API call<\/h2>\n\n<p>Every wallet API call has the same parts. Learn them once. They transfer to any provider. Here is a read request, piece by piece.<\/p>\n\n<div class=\"cs-pre\"><code><span class=\"c-cmt\">GET<\/span> <span class=\"c-key\">https:\/\/api.example.com\/v1<\/span><span class=\"c-str\">\/wallet\/0x7a2b&#8230;9f1c\/balances<\/span>?chain=ethereum&amp;currency=usd\nX-API-KEY: your_key_here<\/code><\/div>\n\n<p>Read that URL from left to right.<\/p>\n\n<ul>\n  <li><strong>Base URL and version:<\/strong> <code>https:\/\/api.example.com\/v1<\/code> is the host.<\/li>\n  <li><strong>Resource path:<\/strong> <code>\/wallet\/{address}\/balances<\/code> names what you want.<\/li>\n  <li><strong>Path parameter:<\/strong> the wallet address sits inside the path.<\/li>\n  <li><strong>Query parameters:<\/strong> <code>chain<\/code> and <code>currency<\/code> narrow the result.<\/li>\n  <li><strong>Headers:<\/strong> <code>X-API-KEY<\/code> carries your key. Content-Type is JSON.<\/li>\n<\/ul>\n\n<p>The response is JSON. It has a predictable shape. You read the fields you need.<\/p>\n\n<div class=\"cs-pre\"><code>{\n  <span class=\"c-str\">\"address\"<\/span>: <span class=\"c-str\">\"0x7a2b&#8230;9f1c\"<\/span>,\n  <span class=\"c-str\">\"chain\"<\/span>: <span class=\"c-str\">\"ethereum\"<\/span>,\n  <span class=\"c-str\">\"nativeBalance\"<\/span>: <span class=\"c-str\">\"1.42\"<\/span>,\n  <span class=\"c-str\">\"tokens\"<\/span>: [\n    { <span class=\"c-str\">\"symbol\"<\/span>: <span class=\"c-str\">\"USDC\"<\/span>, <span class=\"c-str\">\"amount\"<\/span>: <span class=\"c-str\">\"820.0\"<\/span>, <span class=\"c-str\">\"valueUsd\"<\/span>: <span class=\"c-str\">\"820.0\"<\/span> }\n  ],\n  <span class=\"c-str\">\"totalValueUsd\"<\/span>: <span class=\"c-str\">\"48210.55\"<\/span>\n}<\/code><\/div>\n\n<p>Ignore fields you do not use. Response shapes differ slightly per provider. The pattern stays the same. Address in, structured data out.<\/p>\n\n<h2 id=\"s19\">Crypto wallet API in practice<\/h2>\n\n<p>Say you want a user&#8217;s full portfolio. Native coins, tokens, and DeFi positions. You can build it yourself, or call a wallet API. Here is the contrast.<\/p>\n\n<div style=\"background:#1A1B2E;border-radius:14px;overflow:hidden;padding:0;margin:24px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n  <div style=\"overflow-x:auto;\">\n    <table style=\"border:none;width:100%;border-collapse:separate;border-spacing:0;font-size:13.5px;color:#FFFFFF;\">\n      <thead style=\"border:none;\"><tr style=\"border:none;\">\n        <th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg, #C238E8 0%, #DA3DC1 100%);\">Task<\/th>\n        <th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg, #DA3DC1 0%, #EE4595 100%);\">Build it yourself<\/th>\n        <th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg, #EE4595 0%, #FF4F7C 100%);\">With a wallet API<\/th>\n      <\/tr><\/thead>\n      <tbody style=\"border:none;\">\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Read native balances<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">One node call per chain<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">One API call<\/td><\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Read token balances<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Scan logs, call balanceOf<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">In the response<\/td><\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Add USD prices<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Wire a price feed<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Included<\/td><\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Cover many chains<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Run a node per chain<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">One endpoint<\/td><\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Filter spam tokens<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Build your own filter<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Built in<\/td><\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Keep it running<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">You maintain it<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Provider maintains it<\/td><\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\"><td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Time to ship<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Weeks<\/td><td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Hours<\/td><\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n<\/div>\n\n<p>Both paths work. One takes weeks. The other takes an afternoon. CoinStats API returns this across 120+ chains. A wallet API removes the heavy lifting.<\/p>\n\n<h2 id=\"s8\">Authentication and security<\/h2>\n\n<p>Most wallet data APIs use an API key. You send it in a header. The server checks it on every request. Keep it on your server. Never ship it in frontend code.<\/p>\n\n<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 700 360\" width=\"100%\" style=\"max-width:700px;display:block;margin:24px auto;\">\n  <defs>\n    <linearGradient id=\"csAff6\" x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"0%\">\n      <stop offset=\"0%\" stop-color=\"#C238E8\"\/>\n      <stop offset=\"100%\" stop-color=\"#FF4F7C\"\/>\n    <\/linearGradient>\n  <\/defs>\n  <rect x=\"0\" y=\"0\" width=\"700\" height=\"360\" rx=\"14\" fill=\"#1A1B2E\"\/>\n  <text x=\"24\" y=\"32\" fill=\"#FFFFFF\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" font-weight=\"700\" letter-spacing=\"1.6\">AUTH PATTERNS<\/text>\n  <text x=\"120\" y=\"72\" fill=\"#A8A4B8\" font-family=\"-apple-system, sans-serif\" font-size=\"10\" font-weight=\"700\" letter-spacing=\"1.2\" text-anchor=\"middle\">METHOD<\/text>\n  <text x=\"380\" y=\"72\" fill=\"#A8A4B8\" font-family=\"-apple-system, sans-serif\" font-size=\"10\" font-weight=\"700\" letter-spacing=\"1.2\" text-anchor=\"middle\">HOW IT WORKS<\/text>\n  <text x=\"610\" y=\"72\" fill=\"#A8A4B8\" font-family=\"-apple-system, sans-serif\" font-size=\"10\" font-weight=\"700\" letter-spacing=\"1.2\" text-anchor=\"middle\">SECURITY<\/text>\n  <rect x=\"24\" y=\"88\" width=\"192\" height=\"60\" rx=\"8\" fill=\"#FFF9F5\"\/>\n  <text x=\"120\" y=\"115\" fill=\"#1A1B2E\" font-family=\"-apple-system, sans-serif\" font-size=\"14\" font-weight=\"800\" text-anchor=\"middle\">API KEY<\/text>\n  <text x=\"120\" y=\"133\" fill=\"#888780\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" text-anchor=\"middle\">simplest<\/text>\n  <text x=\"380\" y=\"116\" fill=\"#FFFFFF\" font-family=\"-apple-system, sans-serif\" font-size=\"12\" text-anchor=\"middle\">Send a static key in the X-API-KEY header.<\/text>\n  <text x=\"380\" y=\"134\" fill=\"#A8A4B8\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" text-anchor=\"middle\">Server-side only. Never in frontend.<\/text>\n  <rect x=\"556\" y=\"110\" width=\"32\" height=\"6\" rx=\"2\" fill=\"url(#csAff6)\"\/>\n  <rect x=\"592\" y=\"110\" width=\"32\" height=\"6\" rx=\"2\" fill=\"#3E3D52\"\/>\n  <rect x=\"628\" y=\"110\" width=\"32\" height=\"6\" rx=\"2\" fill=\"#3E3D52\"\/>\n  <line x1=\"24\" y1=\"172\" x2=\"676\" y2=\"172\" stroke=\"#3E3D52\" stroke-width=\"1\"\/>\n  <rect x=\"24\" y=\"184\" width=\"192\" height=\"60\" rx=\"8\" fill=\"#FFF9F5\"\/>\n  <text x=\"120\" y=\"211\" fill=\"#1A1B2E\" font-family=\"-apple-system, sans-serif\" font-size=\"14\" font-weight=\"800\" text-anchor=\"middle\">OAUTH 2.0<\/text>\n  <text x=\"120\" y=\"229\" fill=\"#888780\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" text-anchor=\"middle\">user-delegated<\/text>\n  <text x=\"380\" y=\"212\" fill=\"#FFFFFF\" font-family=\"-apple-system, sans-serif\" font-size=\"12\" text-anchor=\"middle\">Exchange a code for a short-lived token.<\/text>\n  <text x=\"380\" y=\"230\" fill=\"#A8A4B8\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" text-anchor=\"middle\">Tokens rotate. Scope per integration.<\/text>\n  <rect x=\"556\" y=\"206\" width=\"32\" height=\"6\" rx=\"2\" fill=\"url(#csAff6)\"\/>\n  <rect x=\"592\" y=\"206\" width=\"32\" height=\"6\" rx=\"2\" fill=\"url(#csAff6)\"\/>\n  <rect x=\"628\" y=\"206\" width=\"32\" height=\"6\" rx=\"2\" fill=\"#3E3D52\"\/>\n  <line x1=\"24\" y1=\"268\" x2=\"676\" y2=\"268\" stroke=\"#3E3D52\" stroke-width=\"1\"\/>\n  <rect x=\"24\" y=\"280\" width=\"192\" height=\"60\" rx=\"8\" fill=\"#FFF9F5\"\/>\n  <text x=\"120\" y=\"307\" fill=\"#1A1B2E\" font-family=\"-apple-system, sans-serif\" font-size=\"14\" font-weight=\"800\" text-anchor=\"middle\">HMAC<\/text>\n  <text x=\"120\" y=\"325\" fill=\"#888780\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" text-anchor=\"middle\">signed request<\/text>\n  <text x=\"380\" y=\"308\" fill=\"#FFFFFF\" font-family=\"-apple-system, sans-serif\" font-size=\"12\" text-anchor=\"middle\">Hash the request with a shared secret.<\/text>\n  <text x=\"380\" y=\"326\" fill=\"#A8A4B8\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" text-anchor=\"middle\">Used for write APIs on exchanges.<\/text>\n  <rect x=\"556\" y=\"302\" width=\"32\" height=\"6\" rx=\"2\" fill=\"url(#csAff6)\"\/>\n  <rect x=\"592\" y=\"302\" width=\"32\" height=\"6\" rx=\"2\" fill=\"url(#csAff6)\"\/>\n  <rect x=\"628\" y=\"302\" width=\"32\" height=\"6\" rx=\"2\" fill=\"url(#csAff6)\"\/>\n<\/svg>\n\n<p>Some providers add OAuth for user-linked data. Exchanges often require HMAC for writes. Reading public wallet data rarely needs more than a key.<\/p>\n\n<h3>Security checklist<\/h3>\n\n<ul>\n  <li>Keep API keys server-side. Proxy requests through your backend.<\/li>\n  <li>Rotate keys on a schedule. Revoke leaked keys fast.<\/li>\n  <li>Scope keys to least privilege. Stay read-only where you can.<\/li>\n  <li>Restrict by IP or domain when the provider supports it.<\/li>\n  <li>Log usage. Watch for spikes and odd patterns.<\/li>\n<\/ul>\n\n<h2 id=\"s9\">Rate limits and pricing<\/h2>\n\n<p>Wallet APIs are not free to run. Reading many chains costs the provider. So providers cap usage and charge for volume. Three pricing models are common.<\/p>\n\n<ul>\n  <li><strong>Request-based:<\/strong> you pay per call. Simple to reason about.<\/li>\n  <li><strong>Credit-based:<\/strong> each endpoint costs credits. Heavy calls cost more.<\/li>\n  <li><strong>Tier-based:<\/strong> a flat monthly plan with set limits.<\/li>\n<\/ul>\n\n<p>No model is best. Each one fits different usage. CoinStats API uses credit-based pricing with a free tier.<\/p>\n\n<p>Rate limits cap requests per second. Watch for 429 responses. Respect the Retry-After header. Back off and retry instead of hammering.<\/p>\n\n<p>Do the math before you commit. Say you refresh 500 wallets every 5 minutes. That is 500 &#215; 12 &#215; 24 = 144,000 reads per day. Model that against any plan first.<\/p>\n\n<h3>Is there a free tier?<\/h3>\n\n<p>Often yes. Most providers offer a free tier for testing. The limits are lower. It is enough to build and validate. CoinStats API includes a free tier to start.<\/p>\n\n<h2 id=\"s10\">When a wallet API is the wrong tool<\/h2>\n\n<p>A wallet data API is not always the right fit. Sometimes you need something lower or higher level. Here is where it falls short.<\/p>\n\n<ul>\n  <li>You need raw mempool data. Use a node or RPC provider.<\/li>\n  <li>You need to sign or send funds. Use a provisioning API.<\/li>\n  <li>You need millisecond trade fills. Use an exchange API.<\/li>\n  <li>You need custom contract events. Use an indexer.<\/li>\n  <li>You need one chain in deep detail. A dedicated node may fit.<\/li>\n<\/ul>\n\n<p>A wallet API is for reading portfolio state. It is not a node. It is not a broker. It is not a signer.<\/p>\n\n<h2 id=\"s11\">How to choose a wallet API<\/h2>\n\n<p>Most wallet APIs look similar on the homepage. The differences show up in production. Weigh these factors before you commit.<\/p>\n\n<div class=\"cs-grid\">\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#128279;<\/span><span class=\"t\">Chain coverage<\/span><\/div>\n    <div class=\"cs-card-b\">Does it read every chain you need today and next quarter?<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#127806;<\/span><span class=\"t\">DeFi protocol depth<\/span><\/div>\n    <div class=\"cs-card-b\">How many protocols does it resolve positions for?<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#129529;<\/span><span class=\"t\">Spam filtering<\/span><\/div>\n    <div class=\"cs-card-b\">Does it hide scam and dust tokens by default?<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#9889;<\/span><span class=\"t\">Latency<\/span><\/div>\n    <div class=\"cs-card-b\">How fast are the endpoints you will call most?<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#128179;<\/span><span class=\"t\">Pricing model<\/span><\/div>\n    <div class=\"cs-card-b\">Can you model your monthly cost cleanly?<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#128260;<\/span><span class=\"t\">Freshness<\/span><\/div>\n    <div class=\"cs-card-b\">How current are balances, positions, and prices?<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#128218;<\/span><span class=\"t\">Docs quality<\/span><\/div>\n    <div class=\"cs-card-b\">Are there working examples for your stack?<\/div>\n  <\/div>\n  <div class=\"cs-card\">\n    <div class=\"cs-card-h\"><span class=\"i\">&#129302;<\/span><span class=\"t\">AI readiness<\/span><\/div>\n    <div class=\"cs-card-b\">Is there an MCP Server for agent access?<\/div>\n  <\/div>\n<\/div>\n\n<h2 id=\"s12\">Common mistakes to avoid<\/h2>\n\n<p>These mistakes cost teams the most time. Most are easy to avoid once named.<\/p>\n\n<ol>\n  <li>Picking on price before testing latency.<\/li>\n  <li>Assuming a chain works because the logo appears.<\/li>\n  <li>Storing API keys in frontend code.<\/li>\n  <li>Skipping the rate-limit math for production load.<\/li>\n  <li>Trusting token symbols to be unique across chains.<\/li>\n  <li>Showing spam tokens as real holdings.<\/li>\n  <li>Caching live prices for too long.<\/li>\n  <li>Ignoring pagination on long transaction histories.<\/li>\n<\/ol>\n\n<h2 id=\"s13\">Provider types and when they fit<\/h2>\n\n<p>Wallet data is served by a few kinds of providers. Each sits at a different layer. Match the type to your job.<\/p>\n\n<div style=\"background:#1A1B2E;border-radius:14px;overflow:hidden;padding:0;margin:24px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n  <div style=\"overflow-x:auto;\">\n    <table style=\"border:none;width:100%;border-collapse:separate;border-spacing:0;font-size:13.5px;color:#FFFFFF;\">\n      <thead style=\"border:none;\"><tr style=\"border:none;\">\n        <th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg, #C238E8 0%, #D13DCD 100%);\">Provider type<\/th>\n        <th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg, #D13DCD 0%, #E040B5 100%);\">Common fit<\/th>\n        <th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg, #E040B5 0%, #EE4595 100%);\">Not ideal for<\/th>\n        <th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg, #EE4595 0%, #FF4F7C 100%);\">What to verify<\/th>\n      <\/tr><\/thead>\n      <tbody style=\"border:none;\">\n        <tr style=\"border:none;background:#1A1B2E;\">\n          <td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Wallet data API<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Portfolio reads across chains<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Order execution and custody<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Chain list, free-tier limits<\/td>\n        <\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\">\n          <td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">RPC \/ node provider<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Raw chain access and calls<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Clean portfolio views<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Chains, throughput, pricing<\/td>\n        <\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\">\n          <td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Onchain indexer<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Custom queries on events<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Fast time to ship<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Schema, freshness, limits<\/td>\n        <\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\">\n          <td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Wallet-as-a-service<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Creating and signing wallets<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Read-only analytics<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Custody model, security<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n<\/div>\n\n<p>CoinStats API is a wallet data API. It reads portfolios across chains. RPC and indexer tools sit lower in the stack. Many teams combine a data API with a node. For a shortlist, see our <a href=\"https:\/\/coinstats.app\/blog\/best-crypto-wallet-apis\/\">best crypto wallet APIs<\/a> guide.<\/p>\n\n<h2 id=\"s21\">Crypto wallet API providers<\/h2>\n\n<p>Here are a few providers as examples. Treat it as a starting point. Verify the details for your own case.<\/p>\n\n<div style=\"background:#1A1B2E;border-radius:14px;overflow:hidden;padding:0;margin:24px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n  <div style=\"overflow-x:auto;\">\n    <table style=\"border:none;width:100%;border-collapse:separate;border-spacing:0;font-size:13.5px;color:#FFFFFF;\">\n      <thead style=\"border:none;\"><tr style=\"border:none;\">\n        <th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg, #C238E8 0%, #D13DCD 100%);\">Provider<\/th>\n        <th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg, #D13DCD 0%, #E040B5 100%);\">Common fit<\/th>\n        <th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg, #E040B5 0%, #EE4595 100%);\">Not ideal for<\/th>\n        <th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg, #EE4595 0%, #FF4F7C 100%);\">What to verify<\/th>\n      <\/tr><\/thead>\n      <tbody style=\"border:none;\">\n        <tr style=\"border:none;background:#1A1B2E;\">\n          <td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">CoinStats API<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Multi-chain portfolio data and risk<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Order execution and custody<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Chain list, free-tier limits<\/td>\n        <\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\">\n          <td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Alchemy<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">EVM RPC and enhanced APIs<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Broad non-EVM coverage<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Supported chains, pricing tiers<\/td>\n        <\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\">\n          <td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Covalent<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Multichain wallet data, 100+ chains<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Deep per-protocol DeFi<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Chain list, pricing<\/td>\n        <\/tr>\n        <tr style=\"border:none;background:#1A1B2E;\">\n          <td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Allium<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Enterprise onchain data at scale<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Quick self-serve start<\/td>\n          <td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Access model, pricing<\/td>\n        <\/tr>\n      <\/tbody>\n    <\/table>\n  <\/div>\n<\/div>\n\n<p>No single provider wins for everything. Match the provider to your chains and your budget. Test latency before you commit.<\/p>\n\n<h2 id=\"s14\">Your first wallet API call<\/h2>\n\n<p>Time to read a real wallet. Sign up and <a href=\"https:\/\/openapi.coinstats.app\/\">grab a free key<\/a>. Then call the balance endpoint. Here it is in three languages.<\/p>\n\n<p>First, the shell version.<\/p>\n\n<div class=\"cs-pre\"><code><span class=\"c-cmt\"># Shell: read token balances for one address on one chain<\/span>\n<span class=\"c-cmt\"># 0xd8dA...6045 is a public example address<\/span>\nc&#117;rl -G \"https:\/\/openapiv1.coinstats.app\/wallet\/balance\" \\\n  --data-urlencode \"address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045\" \\\n  --data-urlencode \"connectionId=ethereum\" \\\n  -H \"X-API-KEY: $COINSTATS_API_KEY\" \\\n  -w \"\\nHTTP %{http_code}\\n\"<\/code><\/div>\n\n<p>Same call from JavaScript.<\/p>\n\n<div class=\"cs-pre\"><code><span class=\"c-cmt\">\/\/ JavaScript: fetch with error handling<\/span>\nconst address = \"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045\"; <span class=\"c-cmt\">\/\/ public example<\/span>\nconst url = `https:\/\/openapiv1.coinstats.app\/wallet\/balance?address=${address}&amp;connectionId=ethereum`;\ntry {\n  const res = await fetch(url, {\n    headers: { \"X-API-KEY\": process.en&#118;.COINSTATS_API_KEY }\n  });\n  if (!res.ok) throw new Error(`HTTP ${res.status}`);\n  const data = await res.json();\n  console.log(data);\n} catch (err) {\n  console.error(\"Wallet API call failed:\", err.message);\n}<\/code><\/div>\n\n<p>And from Python.<\/p>\n\n<div class=\"cs-pre\"><code><span class=\"c-cmt\"># Python: requests with timeout and error handling<\/span>\nimport os, requests\ntry:\n    res = requests.get(\n        \"https:\/\/openapiv1.coinstats.app\/wallet\/balance\",\n        params={\"address\": \"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045\", \"connectionId\": \"ethereum\"},\n        headers={\"X-API-KEY\": os.envir&#111;n[\"COINSTATS_API_KEY\"]},\n        timeout=10,\n    )\n    res.raise_for_status()\n    print(res.json())\nexcept requests.exceptions.RequestException as e:\n    print(f\"Wallet API call failed: {e}\")<\/code><\/div>\n\n<p class=\"cs-note\">In production, also handle timeouts, retries, and rate limits. Watch for invalid keys, empty responses, and partial data.<\/p>\n\n<p>A successful call returns an array of token objects. Each one looks like this.<\/p>\n\n<div class=\"cs-pre\"><code>[\n  {\n    \"coinId\": \"ethereum\",\n    \"name\": \"Ethereum\",\n    \"symbol\": \"ETH\",\n    \"amount\": 1.42,\n    \"price\": 3120.55,\n    \"chain\": \"ethereum\",\n    \"connectionId\": \"ethereum\",\n    \"decimals\": 18,\n    \"contractAddress\": null\n  }\n]<\/code><\/div>\n\n<p>This reads Ethereum balances only. A single-chain request costs 40 credits. For many chains, pass comma-separated chains or all. Model the cost before production. See the <a href=\"https:\/\/coinstats.app\/api-docs\/wallet\/ethereum-evm\/\">Ethereum and EVM wallet docs<\/a> for every field. Reading Solana instead? Use the <a href=\"https:\/\/coinstats.app\/api-docs\/wallet\/solana\/\">Solana wallet docs<\/a>.<\/p>\n\n<div style=\"background:#1A1B2E;border-radius:14px;padding:22px 26px;margin:32px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n  <div style=\"font-size:12px;font-weight:800;letter-spacing:1.4px;text-transform:uppercase;color:#FF4F7C;margin-bottom:12px;\">Do not<\/div>\n  <ul style=\"margin:0;padding-left:20px;color:#FFFFFF;font-size:14.5px;line-height:1.7;\">\n    <li>Put API keys in frontend code.<\/li>\n    <li>Poll wallet balances every few seconds.<\/li>\n    <li>Assume token symbols are unique across chains.<\/li>\n    <li>Assume every chain is supported by every provider.<\/li>\n    <li>Let AI agents move funds without explicit user confirmation.<\/li>\n    <li>Treat responses as always complete or always fresh.<\/li>\n  <\/ul>\n<\/div>\n\n<h2 id=\"s20\">Crypto wallet API examples<\/h2>\n\n<p>Here are common crypto wallet API calls. Each uses one address and a chain. Swap connectionId to change the chain.<\/p>\n\n<div class=\"cs-pre\"><code><span class=\"c-cmt\"># Replace 0x... with a wallet address. Every call needs your X-API-KEY header.<\/span>\n\n<span class=\"c-cmt\"># Token balances on Ethereum<\/span>\nGET https:\/\/openapiv1.coinstats.app\/wallet\/balance?address=0x...&amp;connectionId=ethereum\n\n<span class=\"c-cmt\"># Balances across all chains in one call<\/span>\nGET https:\/\/openapiv1.coinstats.app\/wallet\/balances?address=0x...&amp;blockchain=all\n\n<span class=\"c-cmt\"># A Bitcoin wallet from an extended public key<\/span>\nGET https:\/\/openapiv1.coinstats.app\/wallet\/balance?address=zpub...&amp;connectionId=bitcoin\n\n<span class=\"c-cmt\"># Transaction history, 50 per page<\/span>\nGET https:\/\/openapiv1.coinstats.app\/wallet\/transactions?address=0x...&amp;connectionId=ethereum&amp;limit=50\n\n<span class=\"c-cmt\"># DeFi positions for a wallet<\/span>\nGET https:\/\/openapiv1.coinstats.app\/wallet\/defi?address=0x...&amp;connectionId=ethereum<\/code><\/div>\n\n<p>Each endpoint costs 40 credits per chain. The all-chains call costs more. See the <a href=\"https:\/\/coinstats.app\/api-docs\/\">API docs<\/a> for parameters and limits.<\/p>\n\n<h2 id=\"s15\">Best practices<\/h2>\n\n<p>A few habits keep a wallet integration fast and cheap.<\/p>\n\n<ul>\n  <li><strong>Cache cold data hard.<\/strong> Token metadata rarely changes. Cache it for hours.<\/li>\n  <li><strong>Never cache hot data long.<\/strong> Prices and balances move. Use short TTLs.<\/li>\n  <li><strong>Use canonical IDs.<\/strong> Match tokens by contract address, not symbol.<\/li>\n  <li><strong>Set TTL by data type.<\/strong> Metadata for hours. Balances for seconds.<\/li>\n  <li><strong>Monitor the basics.<\/strong> Track error rate, p95 latency, and rate-limit headroom.<\/li>\n  <li><strong>Handle pagination.<\/strong> Long transaction histories arrive in pages.<\/li>\n  <li><strong>Batch where you can.<\/strong> Group wallet reads to cut overhead.<\/li>\n<\/ul>\n\n<h2 id=\"s16\">Wallet APIs and AI agents<\/h2>\n\n<p>AI agents now read wallets too. They need tools, not raw HTTP. MCP is the emerging pattern for this. It exposes API endpoints as agent tools.<\/p>\n\n<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 700 210\" width=\"100%\" style=\"max-width:700px;display:block;margin:24px auto;\">\n  <defs>\n    <linearGradient id=\"csAff7\" x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"0%\">\n      <stop offset=\"0%\" stop-color=\"#C238E8\"\/>\n      <stop offset=\"100%\" stop-color=\"#FF4F7C\"\/>\n    <\/linearGradient>\n    <marker id=\"arrowAI\" markerWidth=\"6\" markerHeight=\"6\" refX=\"5\" refY=\"3\" orient=\"auto\"><path d=\"M 0 0 L 5 3 L 0 6 z\" fill=\"#A8A4B8\"\/><\/marker>\n  <\/defs>\n  <rect x=\"0\" y=\"0\" width=\"700\" height=\"210\" rx=\"14\" fill=\"#1A1B2E\"\/>\n  <text x=\"24\" y=\"32\" fill=\"#FFFFFF\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" font-weight=\"700\" letter-spacing=\"1.6\">AI AGENT ACCESS<\/text>\n  <rect x=\"40\" y=\"80\" width=\"170\" height=\"64\" rx=\"10\" fill=\"#FFF9F5\"\/>\n  <text x=\"125\" y=\"112\" fill=\"#1A1B2E\" font-family=\"-apple-system, sans-serif\" font-size=\"14\" font-weight=\"800\" text-anchor=\"middle\">AI agent<\/text>\n  <text x=\"125\" y=\"130\" fill=\"#888780\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" text-anchor=\"middle\">plain language<\/text>\n  <rect x=\"265\" y=\"80\" width=\"170\" height=\"64\" rx=\"10\" fill=\"url(#csAff7)\"\/>\n  <text x=\"350\" y=\"112\" fill=\"#FFFFFF\" font-family=\"-apple-system, sans-serif\" font-size=\"14\" font-weight=\"800\" text-anchor=\"middle\">MCP Server<\/text>\n  <text x=\"350\" y=\"130\" fill=\"#FFFFFF\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" text-anchor=\"middle\" opacity=\"0.92\">tool layer<\/text>\n  <rect x=\"490\" y=\"80\" width=\"170\" height=\"64\" rx=\"10\" fill=\"#FFF9F5\"\/>\n  <text x=\"575\" y=\"112\" fill=\"#1A1B2E\" font-family=\"-apple-system, sans-serif\" font-size=\"14\" font-weight=\"800\" text-anchor=\"middle\">Wallet data<\/text>\n  <text x=\"575\" y=\"130\" fill=\"#888780\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" text-anchor=\"middle\">balances, positions<\/text>\n  <text x=\"237\" y=\"104\" fill=\"#FFFFFF\" font-family=\"-apple-system, sans-serif\" font-size=\"10\" text-anchor=\"middle\">asks<\/text>\n  <text x=\"462\" y=\"104\" fill=\"#FFFFFF\" font-family=\"-apple-system, sans-serif\" font-size=\"10\" text-anchor=\"middle\">returns<\/text>\n  <path d=\"M 212 116 L 261 116\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" fill=\"none\" marker-end=\"url(#arrowAI)\"\/>\n  <path d=\"M 437 116 L 486 116\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" fill=\"none\" marker-end=\"url(#arrowAI)\"\/>\n  <text x=\"350\" y=\"186\" fill=\"#A8A4B8\" font-family=\"-apple-system, sans-serif\" font-size=\"11\" text-anchor=\"middle\">An agent calls wallet endpoints as tools.<\/text>\n<\/svg>\n\n<p>An agent asks a question in plain language. An MCP Server maps it to a wallet endpoint. The data comes back as a tool result. CoinStats API exposes a REST API and an MCP Server.<\/p>\n\n<p>For production agents, keep wallet tools read-only by default. Require explicit user confirmation for any write.<\/p>\n\n<h2 id=\"s17\">Integration checklist<\/h2>\n\n<p>Use this before you commit to a provider. Answer these ten questions first.<\/p>\n\n<ol>\n  <li>Does it read every chain I need today?<\/li>\n  <li>Does it cover the next chains I will add?<\/li>\n  <li>How fresh are balances and prices?<\/li>\n  <li>How does it resolve DeFi positions?<\/li>\n  <li>Does it filter spam and scam tokens?<\/li>\n  <li>What is the rate-limit shape: RPS, burst, daily?<\/li>\n  <li>What happens on a 429? Is there Retry-After?<\/li>\n  <li>What is the pricing model? Can I model cost?<\/li>\n  <li>Does it support xpub keys for Bitcoin?<\/li>\n  <li>Is there an MCP Server for agents?<\/li>\n<\/ol>\n\n<h2>Putting it together<\/h2>\n\n<p>A crypto wallet API turns an address into clean data. Start on the read side. Cover the chains your users hold. Filter spam, cache wisely, and watch your limits. The right provider fades into the background.<\/p>\n\n<h2 id=\"s18\">Frequently Asked Questions<\/h2>\n\n<p>Quick answers to common questions about crypto wallet APIs.<\/p>\n\n<div style=\"margin:24px 0;\">\n\n<details>\n  <summary>What is a crypto wallet API in plain English?<\/summary>\n  <div><p>It is an HTTP endpoint that returns wallet data. You send a public address. You get balances, transactions, and positions back.<\/p><\/div>\n<\/details>\n<details>\n  <summary>Wallet data API vs provisioning API: what is the difference?<\/summary>\n  <div><p>A data API reads onchain wallet state. A provisioning API creates wallets and signs transactions. This guide covers the data side.<\/p><\/div>\n<\/details>\n<details>\n  <summary>Does a wallet API need my private keys?<\/summary>\n  <div><p>No. A wallet data API reads public state. It never needs keys. It cannot move funds.<\/p><\/div>\n<\/details>\n<details>\n  <summary>What is a crypto token balance API?<\/summary>\n  <div><p>It is the endpoint that lists every token an address holds. It returns amounts, symbols, and values.<\/p><\/div>\n<\/details>\n<details>\n  <summary>What is a crypto wallet DeFi positions API?<\/summary>\n  <div><p>It resolves staked, lent, and LP holdings per protocol. It turns opaque receipts into readable positions.<\/p><\/div>\n<\/details>\n<details>\n  <summary>Can a wallet API show wrong data?<\/summary>\n  <div><p>Yes. Data can be stale or incomplete. Cache carefully. Verify critical numbers against another source.<\/p><\/div>\n<\/details>\n<details>\n  <summary>Is there a free crypto wallet API?<\/summary>\n  <div><p>Many providers offer a free tier. The limits are lower. It is enough to build and test. CoinStats API has a free tier.<\/p><\/div>\n<\/details>\n<details>\n  <summary>How do I read a wallet across many chains?<\/summary>\n  <div><p>Use an API that covers them. Some return all EVM chains in one call. CoinStats API reads 24+ EVM chains.<\/p><\/div>\n<\/details>\n<details>\n  <summary>Does a wallet API support Bitcoin xpub keys?<\/summary>\n  <div><p>Some do. An xpub covers many derived addresses. CoinStats API supports xpub, ypub, and zpub.<\/p><\/div>\n<\/details>\n<details>\n  <summary>How do I authenticate with a wallet API?<\/summary>\n  <div><p>Usually with an API key in a header. Keep it server-side. Never ship it in frontend code.<\/p><\/div>\n<\/details>\n<details>\n  <summary>What is rate limiting?<\/summary>\n  <div><p>It is a cap on requests over time. Exceed it and you get a 429. Back off and retry.<\/p><\/div>\n<\/details>\n<details>\n  <summary>How do I filter spam tokens?<\/summary>\n  <div><p>Use a provider that flags them. Then hide flagged tokens. Do not show dust as real holdings.<\/p><\/div>\n<\/details>\n<details>\n  <summary>Wallet API vs RPC node: which do I need?<\/summary>\n  <div><p>A wallet API gives clean portfolio data. An RPC node gives raw chain access. Most apps want the wallet API.<\/p><\/div>\n<\/details>\n<details>\n  <summary>Can AI agents use a wallet API?<\/summary>\n  <div><p>Yes, through an MCP Server. It exposes endpoints as tools. Keep agents read-only by default.<\/p><\/div>\n<\/details>\n<details>\n  <summary>How current is the data?<\/summary>\n  <div><p>It depends on the provider. Balances update fast. Metadata updates slowly. Check freshness before you rely on it.<\/p><\/div>\n<\/details>\n<details>\n  <summary>Should I build my own wallet indexer?<\/summary>\n  <div><p>Rarely. Running nodes and indexers is costly. An API is faster to ship and maintain.<\/p><\/div>\n<\/details>\n\n<\/div>\n\n<div class=\"cs-cta\" style=\"background:linear-gradient(135deg,#F355BD 0%,#FF7E55 55%,#FF9332 100%);border-radius:16px;padding:32px;margin:32px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:#FFFFFF\">\n  <div style=\"font-size:24px;font-weight:800;margin-bottom:12px;letter-spacing:-0.3px\">Start building with CoinStats Wallet API<\/div>\n  <div style=\"font-size:15px;line-height:1.65;opacity:0.98;margin-bottom:22px\">Wallet balances, transactions, DeFi positions, and token risk. 120+ chains, 10,000+ DeFi protocols, Bitcoin xpub. REST and MCP. Free tier.<\/div>\n  <a href=\"https:\/\/openapi.coinstats.app\/\" style=\"background:#FFFFFF;color:#1A1B2E!important;font-weight:800;font-size:14.5px;padding:14px 28px;border-radius:10px;text-decoration:none!important;letter-spacing:0.2px\">Get your API key &rarr;<\/a>\n<\/div>\n\n<div style=\"margin:24px 0 8px 0;padding-top:16px;border-top:1px solid #F0E5DC;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;font-size:12.5px;color:#9B9B9F;line-height:1.6;font-style:italic;\">This article is for informational and educational purposes only. It is not financial or legal advice. APIs evolve fast. Pricing, features, and chain coverage change. Verify each provider&#8217;s docs before integrating.<\/div>\n\n<\/article>\n<script>\n(function(){\n  var nav=document.querySelector(\".cs-toc-fixed\"); if(!nav) return;\n  var links=[].slice.call(nav.getElementsByTagName(\"a\"));\n  var map=[];\n  links.forEach(function(a){var h=a.getAttribute(\"href\")||\"\"; if(h.charAt(0)===\"#\"){var el=document.getElementById(h.slice(1)); if(el) map.push({a:a,el:el});}});\n  function up(){var probe=130,cur=null; for(var i=0;i<map.length;i++){ if(map[i].el.getBoundingClientRect().top<=probe) cur=map[i]; } links.forEach(function(a){a.classList.remove(\"cs-toc-active\");}); if(cur) cur.a.classList.add(\"cs-toc-active\");}\n  links.forEach(function(a){a.addEventListener(\"click\",function(e){var h=a.getAttribute(\"href\")||\"\"; if(h.charAt(0)!==\"#\") return; var el=document.getElementById(h.slice(1)); if(el){e.preventDefault(); window.scrollTo({top:el.getBoundingClientRect().top+window.pageYOffset-110,behavior:\"smooth\"});}});});\n  window.addEventListener(\"scroll\",up,{passive:true}); window.addEventListener(\"resize\",up); up();\n})();\n<\/script>\n\n","protected":false},"excerpt":{"rendered":"<p>On this page What a crypto wallet API is Two meanings: data vs provisioning What a wallet data API returns Quick decision table Multi-chain coverage Real-world use cases Anatomy of a call Crypto wallet API in practice Authentication and security Rate limits and pricing When it is the wrong tool How to choose one Common mistakes Provider types and when they fit Crypto wallet API providers Your first wallet API call Crypto wallet API examples Best practices Wallet APIs and AI agents Integration checklist FAQ In this guide What a crypto wallet API is Two meanings: data vs provisioning What [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":20941,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"wl_entities_gutenberg":"","inline_featured_image":false,"footnotes":""},"categories":[412],"tags":[],"wl_entity_type":[314],"ppma_author":[364],"class_list":["post-20939","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-crypto-api","wl_entity_type-article","post--single"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is a Crypto Wallet API? 2026 Guide<\/title>\n<meta name=\"description\" content=\"A crypto wallet data API returns balances, transactions, and DeFi positions by address. Learn how wallet APIs work, what to check, and how to start.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/coinstats.app\/blog\/crypto-wallet-api\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is a Crypto Wallet API? The Complete 2026 Guide\" \/>\n<meta property=\"og:description\" content=\"A crypto wallet API returns balances, transactions, and DeFi positions by address. Learn how wallet APIs work, what to check, and how to start.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/coinstats.app\/blog\/crypto-wallet-api\/\" \/>\n<meta property=\"og:site_name\" content=\"CoinStats Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/coinstats\" \/>\n<meta property=\"article:published_time\" content=\"2026-06-05T23:33:46+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-06-06T08:47:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/coinstats.app\/blog\/wp-content\/uploads\/2026\/06\/What-is-Crypto-Wallet-API.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1600\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Tigran Mkrtchyan\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/x.com\/tigran_mk\" \/>\n<meta name=\"twitter:site\" content=\"@coinstats\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Tigran Mkrtchyan\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"16 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":[\"Article\",\"BlogPosting\"],\"@id\":\"https:\\\/\\\/coinstats.app\\\/blog\\\/crypto-wallet-api\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/coinstats.app\\\/blog\\\/crypto-wallet-api\\\/\"},\"author\":{\"name\":\"Tigran Mkrtchyan\",\"@id\":\"https:\\\/\\\/coinstats.app\\\/blog\\\/#\\\/schema\\\/person\\\/6058df4ec794fce2fa5e6fa0f7d743e3\"},\"headline\":\"What Is a Crypto Wallet API? 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