{"id":20685,"date":"2026-05-18T09:44:32","date_gmt":"2026-05-18T09:44:32","guid":{"rendered":"https:\/\/coinstats.app\/blog\/whats-is-ethereum-api\/"},"modified":"2026-06-06T09:56:30","modified_gmt":"2026-06-06T09:56:30","slug":"whats-is-ethereum-api","status":"publish","type":"post","link":"https:\/\/coinstats.app\/blog\/whats-is-ethereum-api\/","title":{"rendered":"What Is an Ethereum API? A Beginner&#8217;s Guide for 2026"},"content":{"rendered":"<style>\n.cs-article{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:#0E0E10;line-height:1.7;font-size:16px;max-width:860px;margin:0 auto;}\n.cs-article h2{font-size:28px;font-weight:800;margin:48px 0 18px 0;color:#0E0E10;line-height:1.25;}\n.cs-article h3{font-size:20px;font-weight:700;margin:32px 0 12px 0;color:#0E0E10;}\n.cs-article p{margin:0 0 16px 0;}\n.cs-article ul,.cs-article ol{margin:0 0 18px 0;padding-left:22px;}\n.cs-article li{margin-bottom:6px;}\n.cs-article a,.cs-article a:link,.cs-article a:visited{color:#0E0E10;text-decoration:underline;}\n.cs-article [style*=\"background:#1A1B2E\"] a{color:#FFFFFF;}\n.cs-article pre{background:#1A1B2E;color:#FFFFFF;border-radius:14px;padding:18px 20px;overflow-x:auto;font-family:'SF Mono',Menlo,Consolas,monospace;font-size:13px;line-height:1.55;margin:18px 0;}\n.cs-article code{font-family:'SF 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UI',sans-serif;}\n.cs-toc-fixed-label{font-size:11px;font-weight:800;letter-spacing:1.2px;text-transform:uppercase;color:#F355BD;margin-bottom:12px;padding-bottom:10px;border-bottom:1px solid #F0E5DC;}\n.cs-toc-fixed ol{list-style:none;padding:0;margin:0;counter-reset:cs-toc 0;}\n.cs-toc-fixed li{counter-increment:cs-toc 1;margin:0;padding:0;}\n.cs-toc-fixed a{display:block;padding:7px 0 7px 22px;font-size:13px;line-height:1.4;color:#1F2024;text-decoration:none;border-left:2px solid transparent;position:relative;transition:color 0.15s ease,border-color 0.15s ease;}\n.cs-toc-fixed a::before{content:counter(cs-toc);position:absolute;left:0;top:7px;font-size:11px;font-weight:700;color:#B4B2A9;}\n.cs-toc-fixed a:hover{color:#F355BD;}\n.cs-toc-fixed a.cs-toc-active{color:#F355BD;font-weight:700;border-left-color:#F355BD;padding-left:24px;}\n.cs-toc-fixed a.cs-toc-active::before{color:#F355BD;left:2px;}\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.cs-card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin:24px 0;}\n.cs-factor-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin:24px 0;}\n.cs-faq{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;margin:24px 0 32px 0;}\n.cs-faq details{background:#FFFFFF;border:1px solid #F0E5DC;border-radius:14px;margin-bottom:10px;overflow:hidden;}\n.cs-faq details[open]{border-color:#F355BD;background:#FFF9F5;}\n.cs-faq summary{padding:18px 22px;cursor:pointer;font-size:16px;font-weight:700;color:#0E0E10;list-style:none;position:relative;padding-right:50px;line-height:1.45;}\n.cs-faq summary::-webkit-details-marker{display:none;}\n.cs-faq summary:after{content:'+';position:absolute;right:22px;top:50%;transform:translateY(-50%);font-size:24px;color:#F355BD;}\n.cs-faq details[open] summary{color:#F355BD;}\n.cs-faq details[open] summary:after{content:'\\2212';}\n.cs-faq .cs-faq-body{padding:0 22px 20px 22px;font-size:15px;line-height:1.7;color:#1F2024;}\n.cs-faq .cs-faq-body p{margin:0 0 14px 0;}\n.cs-faq .cs-faq-body p:last-child{margin:0;}\n@media (max-width:1280px){.cs-toc-fixed{display:none;}}\n@media (max-width:640px){.cs-article{font-size:15px;}.cs-article h2{font-size:24px;margin:36px 0 16px 0;}.cs-article h3{font-size:18px;}.cs-toc ol{columns:1;}}\n#site-content .cs-article [style*=\"background:#1A1B2E\"] a,#site-content [style*=\"background:#1A1B2E\"] a{color:#FFFFFF!important;}<\/style>\n<nav class=\"cs-toc\">\n<div class=\"cs-toc-title\">In this guide<\/div>\n<ol>\n<li><a href=\"#s1\">What an Ethereum API actually means<\/a><\/li>\n<li><a href=\"#s2\">Quick decision table<\/a><\/li>\n<li><a href=\"#s3\">The kinds of data you can read<\/a><\/li>\n<li><a href=\"#s4\">Tokens: ERC-20, ERC-721, ERC-1155<\/a><\/li>\n<li><a href=\"#s5\">Event logs: the chain&#8217;s activity feed<\/a><\/li>\n<li><a href=\"#s6\">Transactions, gas, and fees<\/a><\/li>\n<li><a href=\"#usecases\">Common Ethereum API use cases<\/a><\/li>\n<li><a href=\"#s7\">Anatomy of an Ethereum API call<\/a><\/li>\n<li><a href=\"#s8\">How apps connect to Ethereum<\/a><\/li>\n<li><a href=\"#types\">API vs node provider vs indexer<\/a><\/li>\n<li><a href=\"#s9\">Reading, writing, and staying safe<\/a><\/li>\n<li><a href=\"#s10\">Rate limits, credits, and pricing<\/a><\/li>\n<li><a href=\"#s11\">How to choose your Ethereum API<\/a><\/li>\n<li><a href=\"#s12\">Common mistakes to avoid<\/a><\/li>\n<li><a href=\"#s13\">Examples of Ethereum API providers<\/a><\/li>\n<li><a href=\"#s14\">Your first Ethereum API call<\/a><\/li>\n<li><a href=\"#s15\">Best practices on Ethereum<\/a><\/li>\n<li><a href=\"#s16\">The future: smart accounts and AI<\/a><\/li>\n<li><a href=\"#s17\">Conclusion<\/a><\/li>\n<li><a href=\"#faq\">FAQ<\/a><\/li>\n<\/ol>\n<\/nav>\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 an Ethereum API actually means<\/a><\/li>\n<li><a href=\"#s2\">Quick decision table<\/a><\/li>\n<li><a href=\"#s3\">The kinds of data you can read<\/a><\/li>\n<li><a href=\"#s4\">Tokens: ERC-20, ERC-721, ERC-1155<\/a><\/li>\n<li><a href=\"#s5\">Event logs: the activity feed<\/a><\/li>\n<li><a href=\"#s6\">Transactions, gas, and fees<\/a><\/li>\n<li><a href=\"#usecases\">Common Ethereum API use cases<\/a><\/li>\n<li><a href=\"#s7\">Anatomy of an Ethereum API call<\/a><\/li>\n<li><a href=\"#s8\">How apps connect to Ethereum<\/a><\/li>\n<li><a href=\"#types\">API vs node provider vs indexer<\/a><\/li>\n<li><a href=\"#s9\">Reading, writing, and staying safe<\/a><\/li>\n<li><a href=\"#s10\">Rate limits, credits, and pricing<\/a><\/li>\n<li><a href=\"#s11\">How to choose your Ethereum API<\/a><\/li>\n<li><a href=\"#s12\">Common mistakes to avoid<\/a><\/li>\n<li><a href=\"#s13\">Examples of Ethereum API providers<\/a><\/li>\n<li><a href=\"#s14\">Your first Ethereum API call<\/a><\/li>\n<li><a href=\"#s15\">Best practices on Ethereum<\/a><\/li>\n<li><a href=\"#s16\">The future: smart accounts and AI<\/a><\/li>\n<li><a href=\"#s17\">Conclusion<\/a><\/li>\n<li><a href=\"#faq\">FAQ<\/a><\/li>\n<\/ol>\n<\/nav>\n<div class=\"cs-article\">\n<p>Ethereum runs thousands of apps. Wallets, exchanges, games, and AI agents all read its data. Almost none of them run a full node. They call an Ethereum API instead.<\/p>\n<p>An Ethereum API is the gateway between an app and the chain. It returns balances, token holdings, transaction history, and live events. You ask a question. It answers in clean JSON.<\/p>\n<p>This guide explains what an Ethereum API is, in plain English. It covers the data you can read. It shows how tokens and events work. It helps you choose a provider with confidence.<\/p>\n<p>New to crypto APIs in general? Our <a href=\"https:\/\/coinstats.app\/blog\/what-is-crypto-blockchain-api-understanding-crypto-api-a-beginners-guide\/\">beginner&#8217;s guide to crypto APIs<\/a> covers the basics across every chain first.<\/p>\n<div style=\"background:#1A1B2E;border-radius:14px;padding:22px 26px;margin:28px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n<div style=\"font-size:11px;font-weight:800;letter-spacing:1.4px;text-transform:uppercase;color:#F355BD;margin-bottom:10px;\">Who this guide is for<\/div>\n<div style=\"font-size:14.5px;color:#FFFFFF;line-height:1.65;\">Founders, product leads, and new developers sizing up an Ethereum data layer. You want to read balances, show tokens, track transactions, or feed an AI agent. You want the big picture before you commit to anything.<\/div>\n<\/div>\n<div style=\"background:#FFF9F5;border:2px solid #F355BD;border-radius:14px;padding:18px 22px;margin:28px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n<div style=\"font-size:11px;font-weight:800;letter-spacing:1.4px;text-transform:uppercase;color:#F355BD;margin-bottom:8px;\">Key takeaways<\/div>\n<div style=\"font-size:14.5px;color:#0E0E10;line-height:1.65;\">\n<ul style=\"margin:0;padding-left:20px;\">\n<li>An Ethereum API is a hosted gateway to the Ethereum blockchain.<\/li>\n<li>Most reads come back as JSON over a standard called JSON-RPC.<\/li>\n<li>Token data and event logs power most wallet and dashboard features.<\/li>\n<li>You sign transactions yourself. The API never holds your keys.<\/li>\n<li>One EVM-ready API can also cover Ethereum&#8217;s Layer 2 networks.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<h2 id=\"s1\">What an Ethereum API actually means<\/h2>\n<p><svg viewBox=\"0 0 700 200\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"An app calls an Ethereum API which talks to the Ethereum network\" style=\"width:100%;height:auto;margin:18px 0 24px 0;display:block;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n<defs>\n<linearGradient id=\"ethG1\" x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"0%\"><stop offset=\"0%\" stop-color=\"#C238E8\"\/><stop offset=\"100%\" stop-color=\"#FF4F7C\"\/><\/linearGradient>\n<marker id=\"ethAr1\" 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\">ETHEREUM API GATEWAY<\/text>\n<rect x=\"40\" y=\"78\" width=\"150\" height=\"60\" rx=\"10\" fill=\"#FFFFFF\"\/>\n<text x=\"115\" y=\"105\" fill=\"#1A1B2E\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">Your app<\/text>\n<text x=\"115\" y=\"123\" fill=\"#888780\" font-size=\"11\" font-style=\"italic\" text-anchor=\"middle\">wallet, site, agent<\/text>\n<rect x=\"275\" y=\"78\" width=\"150\" height=\"60\" rx=\"10\" fill=\"url(#ethG1)\"\/>\n<text x=\"350\" y=\"105\" fill=\"#FFFFFF\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">Ethereum API<\/text>\n<text x=\"350\" y=\"123\" fill=\"#FFFFFF\" font-size=\"11\" font-style=\"italic\" text-anchor=\"middle\">JSON-RPC, REST, MCP<\/text>\n<rect x=\"510\" y=\"78\" width=\"150\" height=\"60\" rx=\"10\" fill=\"#FFFFFF\"\/>\n<text x=\"585\" y=\"105\" fill=\"#1A1B2E\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">Ethereum network<\/text>\n<text x=\"585\" y=\"123\" fill=\"#888780\" font-size=\"11\" font-style=\"italic\" text-anchor=\"middle\">nodes, validators<\/text>\n<line x1=\"195\" y1=\"108\" x2=\"265\" y2=\"108\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" marker-end=\"url(#ethAr1)\"\/>\n<line x1=\"430\" y1=\"108\" x2=\"500\" y2=\"108\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" marker-end=\"url(#ethAr1)\"\/>\n<text x=\"350\" y=\"172\" fill=\"#FFFFFF\" font-size=\"10.5\" font-style=\"italic\" text-anchor=\"middle\">The API hides node mechanics behind a stable interface.<\/text>\n<\/svg><\/p>\n<p>An Ethereum API is a hosted service. It sits between your app and the Ethereum network. Your app sends a request. The service talks to the chain and returns an answer.<\/p>\n<p>Under the hood, Ethereum speaks a format called <a href=\"https:\/\/ethereum.org\/en\/developers\/docs\/apis\/json-rpc\/\">JSON-RPC<\/a>. Nodes accept method calls like <code>eth_getBalance<\/code> or <code>eth_call<\/code>. An Ethereum API exposes those methods through a managed endpoint. You skip running and syncing a node yourself.<\/p>\n<p>Ethereum has two layers since 2022. The <a href=\"https:\/\/ethereum.org\/en\/developers\/docs\/\">execution layer<\/a> runs transactions and smart contracts. The consensus layer handles staking and block agreement. Most app data lives on the execution layer. That is the part an Ethereum API reads.<\/p>\n<p><strong>The account model in plain English.<\/strong> Everything on Ethereum lives at an address. A wallet is an address. A token contract is an address. A smart contract is an address too. You query data by naming the address you care about.<\/p>\n<p>There are two account types. An externally owned account is a normal wallet. A contract account holds code, like a token or an app. Reads can target both. The address tells the API what kind of thing it is.<\/p>\n<h2 id=\"s2\">Quick decision table<\/h2>\n<p>Different goals map to different parts of the API. This table is a quick starting point. Later sections explain each row.<\/p>\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;\">\n<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%,#D03D9A 100%);\">If you want<\/th>\n<th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg,#D03D9A 0%,#FF4F7C 100%);\">Start with<\/th>\n<\/tr>\n<\/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;\">A wallet&#8217;s ETH balance<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">A REST balance endpoint, or <code style=\"background:#0E0E10;color:#FFFFFF;\">eth_getBalance<\/code><\/td>\n<\/tr>\n<tr style=\"border:none;background:#22233A;\">\n<td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Token holdings (ERC-20)<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">A token balances endpoint with metadata<\/td>\n<\/tr>\n<tr style=\"border:none;background:#1A1B2E;\">\n<td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">NFT holdings<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">An NFT or digital-asset endpoint<\/td>\n<\/tr>\n<tr style=\"border:none;background:#22233A;\">\n<td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Transaction history<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">An indexed history or activity endpoint<\/td>\n<\/tr>\n<tr style=\"border:none;background:#1A1B2E;\">\n<td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Onchain events<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Event logs via <code style=\"background:#0E0E10;color:#FFFFFF;\">eth_getLogs<\/code><\/td>\n<\/tr>\n<tr style=\"border:none;background:#22233A;\">\n<td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Live updates<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">WebSocket subscriptions (<code style=\"background:#0E0E10;color:#FFFFFF;\">eth_subscribe<\/code>)<\/td>\n<\/tr>\n<tr style=\"border:none;background:#1A1B2E;\">\n<td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Several of these at once<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">An all-in-one data provider<\/td>\n<\/tr>\n<tr style=\"border:none;background:#22233A;\">\n<td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">AI agent access<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">An MCP Server with scoped tools<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h2 id=\"s3\">The kinds of data you can read<\/h2>\n<p>Ethereum data comes in a few clear shapes. Each has its own access pattern. Here is the map before we go deeper.<\/p>\n<div class=\"cs-card-grid\">\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:8px;\">Accounts and balances<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">Native ETH balance and account state, read by address.<\/div>\n<\/div>\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:8px;\">Tokens<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">ERC-20, ERC-721, and ERC-1155 holdings and metadata.<\/div>\n<\/div>\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:8px;\">Transactions<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">Sends, swaps, and mints, plus their receipts and status.<\/div>\n<\/div>\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:8px;\">Event logs<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">The activity feed that contracts emit on every action.<\/div>\n<\/div>\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:8px;\">Gas and fees<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">What a transaction costs, and current network fee levels.<\/div>\n<\/div>\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:8px;\">DeFi and prices<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">Positions and prices spread across many onchain contracts.<\/div>\n<\/div>\n<\/div>\n<p>Two of these shape almost every app. Token data and event logs do the heavy lifting. The next two sections cover them in plain English.<\/p>\n<h2 id=\"s4\">Tokens: ERC-20, ERC-721, ERC-1155<\/h2>\n<p><svg viewBox=\"0 0 700 200\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Three Ethereum token standards\" style=\"width:100%;height:auto;margin:18px 0 24px 0;display:block;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n<defs><linearGradient id=\"ethG2\" x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"0%\"><stop offset=\"0%\" stop-color=\"#C238E8\"\/><stop offset=\"100%\" stop-color=\"#FF4F7C\"\/><\/linearGradient><\/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\">TOKEN STANDARDS<\/text>\n<rect x=\"35\" y=\"66\" width=\"195\" height=\"92\" rx=\"10\" fill=\"url(#ethG2)\"\/>\n<text x=\"132\" y=\"92\" fill=\"#FFFFFF\" font-size=\"14\" font-weight=\"700\" text-anchor=\"middle\">ERC-20<\/text>\n<text x=\"132\" y=\"112\" fill=\"#FFFFFF\" font-size=\"10.5\" font-style=\"italic\" text-anchor=\"middle\">fungible tokens<\/text>\n<text x=\"132\" y=\"132\" fill=\"#FFFFFF\" font-size=\"10.5\" text-anchor=\"middle\">stablecoins, coins<\/text>\n<rect x=\"252\" y=\"66\" width=\"196\" height=\"92\" rx=\"10\" fill=\"#FFFFFF\"\/>\n<text x=\"350\" y=\"92\" fill=\"#1A1B2E\" font-size=\"14\" font-weight=\"700\" text-anchor=\"middle\">ERC-721<\/text>\n<text x=\"350\" y=\"112\" fill=\"#888780\" font-size=\"10.5\" font-style=\"italic\" text-anchor=\"middle\">unique NFTs<\/text>\n<text x=\"350\" y=\"132\" fill=\"#1A1B2E\" font-size=\"10.5\" text-anchor=\"middle\">one of a kind<\/text>\n<rect x=\"470\" y=\"66\" width=\"195\" height=\"92\" rx=\"10\" fill=\"#FFFFFF\"\/>\n<text x=\"567\" y=\"92\" fill=\"#1A1B2E\" font-size=\"14\" font-weight=\"700\" text-anchor=\"middle\">ERC-1155<\/text>\n<text x=\"567\" y=\"112\" fill=\"#888780\" font-size=\"10.5\" font-style=\"italic\" text-anchor=\"middle\">multi-token<\/text>\n<text x=\"567\" y=\"132\" fill=\"#1A1B2E\" font-size=\"10.5\" text-anchor=\"middle\">many types, one contract<\/text>\n<text x=\"350\" y=\"182\" fill=\"#FFFFFF\" font-size=\"10.5\" font-style=\"italic\" text-anchor=\"middle\">Each standard follows shared rules an API can read.<\/text>\n<\/svg><\/p>\n<p>A token on Ethereum is just a smart contract. The contract keeps a ledger of who owns what. Standards make these contracts predictable. An API can read any token that follows a standard.<\/p>\n<h3>ERC-20: fungible tokens<\/h3>\n<p><a href=\"https:\/\/eips.ethereum.org\/EIPS\/eip-20\">ERC-20<\/a> is the standard for fungible tokens. Stablecoins, governance tokens, and most coins use it. Every unit is identical, like dollars. The contract tracks balances with a <code>balanceOf<\/code> method.<\/p>\n<p>To show a wallet&#8217;s tokens, an app reads many contracts. It checks the balance for each token address. Good APIs do this for you. One call returns a full token list with balances.<\/p>\n<h3>ERC-721: NFTs<\/h3>\n<p><a href=\"https:\/\/eips.ethereum.org\/EIPS\/eip-721\">ERC-721<\/a> is the standard for NFTs. Each token has a unique id. <code>ownerOf<\/code> returns who holds a given id. <code>tokenURI<\/code> points to its image and traits.<\/p>\n<h3>ERC-1155: multi-token<\/h3>\n<p><a href=\"https:\/\/eips.ethereum.org\/EIPS\/eip-1155\">ERC-1155<\/a> is a multi-token standard. One contract can hold many token types. It suits games and editions. It mixes fungible and non-fungible items in one place.<\/p>\n<p><strong>Why metadata matters.<\/strong> Raw balances are not enough for users. A balance of <code>1000000000<\/code> means little alone. You also need decimals, name, and symbol. That metadata turns a number into &#8220;1,000 USDC&#8221;. A token-aware API returns both together.<\/p>\n<div style=\"background:#FFF9F5;border:2px solid #F355BD;border-radius:14px;padding:18px 22px;margin:24px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n<div style=\"font-size:11px;font-weight:800;letter-spacing:1.4px;text-transform:uppercase;color:#F355BD;margin-bottom:8px;\">Rule of thumb<\/div>\n<div style=\"font-size:14.5px;color:#0E0E10;line-height:1.65;\">A useful token response bundles four things. Balance, decimals, symbol, and a price. Together they render as real money, not raw digits.<\/div>\n<\/div>\n<p>ERC standards also run on Ethereum&#8217;s Layer 2 networks. Base, Arbitrum, and Optimism use the same token rules. One EVM-ready API can read tokens across all of them. See our <a href=\"https:\/\/coinstats.app\/blog\/best-crypto-wallet-apis\/\">best crypto wallet APIs<\/a> for a cross-chain view.<\/p>\n<h2 id=\"s5\">Event logs: the chain&#8217;s activity feed<\/h2>\n<p><svg viewBox=\"0 0 700 200\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"A contract emits an event that becomes a log your app reads\" style=\"width:100%;height:auto;margin:18px 0 24px 0;display:block;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n<defs><linearGradient id=\"ethG3\" x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"0%\"><stop offset=\"0%\" stop-color=\"#C238E8\"\/><stop offset=\"100%\" stop-color=\"#FF4F7C\"\/><\/linearGradient><marker id=\"ethAr3\" 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><\/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\">EVENTS BECOME LOGS<\/text>\n<rect x=\"40\" y=\"78\" width=\"150\" height=\"60\" rx=\"10\" fill=\"#FFFFFF\"\/>\n<text x=\"115\" y=\"100\" fill=\"#1A1B2E\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">Contract<\/text>\n<text x=\"115\" y=\"118\" fill=\"#888780\" font-size=\"11\" font-style=\"italic\" text-anchor=\"middle\">emits an event<\/text>\n<rect x=\"275\" y=\"78\" width=\"150\" height=\"60\" rx=\"10\" fill=\"url(#ethG3)\"\/>\n<text x=\"350\" y=\"100\" fill=\"#FFFFFF\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">Log<\/text>\n<text x=\"350\" y=\"118\" fill=\"#FFFFFF\" font-size=\"10.5\" font-style=\"italic\" text-anchor=\"middle\">stored onchain<\/text>\n<rect x=\"510\" y=\"78\" width=\"150\" height=\"60\" rx=\"10\" fill=\"#FFFFFF\"\/>\n<text x=\"585\" y=\"100\" fill=\"#1A1B2E\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">Your app<\/text>\n<text x=\"585\" y=\"118\" fill=\"#888780\" font-size=\"11\" font-style=\"italic\" text-anchor=\"middle\">reads, decodes<\/text>\n<line x1=\"195\" y1=\"108\" x2=\"265\" y2=\"108\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" marker-end=\"url(#ethAr3)\"\/>\n<line x1=\"435\" y1=\"108\" x2=\"500\" y2=\"108\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" marker-end=\"url(#ethAr3)\"\/>\n<text x=\"350\" y=\"172\" fill=\"#FFFFFF\" font-size=\"10.5\" font-style=\"italic\" text-anchor=\"middle\">Logs turn raw transactions into readable history.<\/text>\n<\/svg><\/p>\n<p>Every action on Ethereum can emit an event. A token transfer emits a <code>Transfer<\/code> event. A swap emits a swap event. These events become logs stored on the chain. Logs are the activity feed of Ethereum.<\/p>\n<p>Logs explain what happened, in a readable way. A raw transaction only shows that code ran. A log says &#8220;this address sent 50 USDC to that address&#8221;. Apps read logs to build history and alerts.<\/p>\n<h3>How a log is structured<\/h3>\n<p>Each log has an address and a few topics. Topic zero is the event type, stored as a hash. Other topics hold indexed values, like sender and receiver. The data field holds the rest, like the amount.<\/p>\n<p>You fetch logs with a method called <code>eth_getLogs<\/code>. You filter by contract address and event type. You also set a block range. The API returns every matching event in that window.<\/p>\n<p><strong>Decoding comes next.<\/strong> Raw logs are still encoded. You decode them with the contract&#8217;s layout. Many APIs decode common events for you. You get clean fields like from, to, and value.<\/p>\n<p>Logs power a lot of features. Wallet history reads <code>Transfer<\/code> logs for an address. Price tools read swap logs from pools. Alerts watch for one specific event in real time.<\/p>\n<h2 id=\"s6\">Transactions, gas, and fees<\/h2>\n<p><svg viewBox=\"0 0 700 200\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Base fee plus priority fee equals the total gas cost\" style=\"width:100%;height:auto;margin:18px 0 24px 0;display:block;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n<defs><linearGradient id=\"ethG4\" x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"0%\"><stop offset=\"0%\" stop-color=\"#C238E8\"\/><stop offset=\"100%\" stop-color=\"#FF4F7C\"\/><\/linearGradient><\/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\">WHAT A TRANSACTION COSTS<\/text>\n<rect x=\"40\" y=\"74\" width=\"170\" height=\"68\" rx=\"10\" fill=\"#FFFFFF\"\/>\n<text x=\"125\" y=\"102\" fill=\"#1A1B2E\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">Base fee<\/text>\n<text x=\"125\" y=\"122\" fill=\"#888780\" font-size=\"11\" font-style=\"italic\" text-anchor=\"middle\">set by network, burned<\/text>\n<text x=\"234\" y=\"116\" fill=\"#FFFFFF\" font-size=\"22\" font-weight=\"700\" text-anchor=\"middle\">+<\/text>\n<rect x=\"258\" y=\"74\" width=\"170\" height=\"68\" rx=\"10\" fill=\"#FFFFFF\"\/>\n<text x=\"343\" y=\"102\" fill=\"#1A1B2E\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">Priority fee<\/text>\n<text x=\"343\" y=\"122\" fill=\"#888780\" font-size=\"11\" font-style=\"italic\" text-anchor=\"middle\">tip for validators<\/text>\n<text x=\"452\" y=\"116\" fill=\"#FFFFFF\" font-size=\"20\" font-weight=\"700\" text-anchor=\"middle\">=<\/text>\n<rect x=\"476\" y=\"74\" width=\"184\" height=\"68\" rx=\"10\" fill=\"url(#ethG4)\"\/>\n<text x=\"568\" y=\"102\" fill=\"#FFFFFF\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">Total gas cost<\/text>\n<text x=\"568\" y=\"122\" fill=\"#FFFFFF\" font-size=\"11\" font-style=\"italic\" text-anchor=\"middle\">paid in ETH<\/text>\n<text x=\"350\" y=\"176\" fill=\"#FFFFFF\" font-size=\"10.5\" font-style=\"italic\" text-anchor=\"middle\">Fees rise when the network is busy and fall when it is quiet.<\/text>\n<\/svg><\/p>\n<p>A transaction changes the chain. It sends ETH, moves tokens, or calls a contract. You sign it, then submit it through the API. The network includes it in a block.<\/p>\n<p>Every transaction costs gas. Gas measures the work the network does. You pay for that work in ETH. Busy periods cost more. Quiet periods cost less.<\/p>\n<p><strong>Fees have two parts.<\/strong> Since 2021, the fee splits in two. A base fee is set by the network and burned. A priority fee is a tip for validators. You set a cap for each. Your wallet handles the math. This rule is called <a href=\"https:\/\/eips.ethereum.org\/EIPS\/eip-1559\">EIP-1559<\/a>.<\/p>\n<p>An API can report current fee levels. You read recent fees before you send. Then you pick a fee that lands reliably. This avoids stuck or overpriced transactions.<\/p>\n<p>After a transaction lands, you read its receipt. The receipt shows success or failure. It lists the logs the transaction emitted. It also shows the gas actually used.<\/p>\n<h2 id=\"usecases\">Common Ethereum API use cases<\/h2>\n<p>Different products need different data. Here are four common shapes.<\/p>\n<div class=\"cs-card-grid\" style=\"grid-template-columns:repeat(auto-fit,minmax(300px,1fr));\">\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:8px;\">Wallet app<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">Balances, token metadata, transaction history, and price data.<\/div>\n<\/div>\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:8px;\">Portfolio tracker<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">Multichain balances, DeFi positions, and historical values.<\/div>\n<\/div>\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:8px;\">Alerting app<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">Event logs, WebSocket subscriptions, and reliable retry logic.<\/div>\n<\/div>\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:8px;\">AI agent<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">Scoped read-only access, clear tool limits, and safe defaults.<\/div>\n<\/div>\n<\/div>\n<p>Spotting your shape early saves work. It tells you which data and transport to pick.<\/p>\n<h2 id=\"s7\">Anatomy of an Ethereum API call<\/h2>\n<p>Most reads share the same shape. Here is a balance request, using a neutral host.<\/p>\n<pre><code>POST https:\/\/api.example.com\/v1\/ethereum\n\n{\n  \"jsonrpc\": \"2.0\",\n  \"id\": 1,\n  \"method\": \"eth_getBalance\",\n  \"params\": [\"0xYourAddress\", \"latest\"]\n}<\/code><\/pre>\n<p>The method names what you want. The params name the address and the block. Your key rides in a header. Keys live on your server, never in client code.<\/p>\n<p>Here is what comes back.<\/p>\n<pre><code>{\n  \"jsonrpc\": \"2.0\",\n  \"id\": 1,\n  \"result\": \"0x1bc16d674ec80000\"\n}<\/code><\/pre>\n<p>That result is hexadecimal wei. Converted to ETH, it equals 2 ETH.<\/p>\n<p>Balances always return in wei, the smallest unit. You divide by 10 to the 18th for ETH. Most APIs can return human units for you.<\/p>\n<h2 id=\"s8\">How apps connect to Ethereum<\/h2>\n<p>Apps reach Ethereum in three common ways. Each one fits a different job.<\/p>\n<p>One note on names. Ethereum nodes expose JSON-RPC. Some providers also wrap common tasks in REST endpoints. Examples include token balances or wallet history. JSON-RPC sits closer to the chain. REST is often easier for app features.<\/p>\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;\">\n<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%);\">Transport<\/th>\n<th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg,#D13DCD 0%,#E043B2 100%);\">How it works<\/th>\n<th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg,#E043B2 0%,#EF4997 100%);\">Best for<\/th>\n<th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg,#EF4997 0%,#FF4F7C 100%);\">Trade-off<\/th>\n<\/tr>\n<\/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;\">REST \/ JSON-RPC<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Request and reply over HTTPS<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Balances, history, one-off reads<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Polling adds delay for live data<\/td>\n<\/tr>\n<tr style=\"border:none;background:#22233A;\">\n<td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">WebSocket<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">A live socket pushes updates<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">New blocks, pending txs, events<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Needs reconnect handling<\/td>\n<\/tr>\n<tr style=\"border:none;background:#1A1B2E;\">\n<td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">MCP<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Tool calls from an AI agent<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Agents reading Ethereum data<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Scope and limits per tool<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p><strong>WebSocket suits live apps.<\/strong> You subscribe to new blocks or a contract&#8217;s events. The server pushes updates as they happen. You stop polling and save requests.<\/p>\n<p>MCP is the newest option. It lets AI agents call data as named tools. An agent can ask for a wallet&#8217;s balance. Read-only access is the safe default.<\/p>\n<h2 id=\"types\">API vs node provider vs indexer<\/h2>\n<p>These three terms get mixed up. They solve different problems.<\/p>\n<p>A node provider gives raw access to chain methods. You call JSON-RPC and read low-level results.<\/p>\n<p>An indexer organizes raw data into app-level views. It builds history, balances, and decoded events.<\/p>\n<p>A wallet or portfolio API goes further. It bundles balances, metadata, prices, history, and DeFi positions.<\/p>\n<h3>When raw JSON-RPC is not enough<\/h3>\n<p>A simple read like <code>eth_getBalance<\/code> is easy. A full portfolio view is not. That means balances across Ethereum, Base, Arbitrum, and Optimism. It needs indexing, token metadata, and prices. It also needs spam filtering and DeFi decoding. A higher-level API does that work for you.<\/p>\n<h2 id=\"s9\">Reading, writing, and staying safe<\/h2>\n<p>Most Ethereum API calls are reads. Reads need only an API key. Writes are different. A write sends a transaction to the chain.<\/p>\n<p><strong>You sign writes yourself.<\/strong> The signature uses your private key. You then submit the signed transaction. The provider relays the bytes. It never sees your private key.<\/p>\n<p>This keeps a clean split. The provider moves data and transactions. You keep custody of keys. Custodial setups differ and need separate review.<\/p>\n<h3>A safe setup<\/h3>\n<p><svg viewBox=\"0 0 700 200\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Frontend calls your backend, which holds the key and calls the Ethereum API\" style=\"width:100%;height:auto;margin:18px 0 24px 0;display:block;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n<defs><linearGradient id=\"ethG6\" x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"0%\"><stop offset=\"0%\" stop-color=\"#C238E8\"\/><stop offset=\"100%\" stop-color=\"#FF4F7C\"\/><\/linearGradient><marker id=\"ethAr6\" 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><\/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\">KEEP THE KEY ON YOUR SERVER<\/text>\n<rect x=\"40\" y=\"78\" width=\"150\" height=\"60\" rx=\"10\" fill=\"#FFFFFF\"\/>\n<text x=\"115\" y=\"100\" fill=\"#1A1B2E\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">Frontend<\/text>\n<text x=\"115\" y=\"118\" fill=\"#888780\" font-size=\"11\" font-style=\"italic\" text-anchor=\"middle\">no key here<\/text>\n<rect x=\"275\" y=\"78\" width=\"150\" height=\"60\" rx=\"10\" fill=\"url(#ethG6)\"\/>\n<text x=\"350\" y=\"100\" fill=\"#FFFFFF\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">Your backend<\/text>\n<text x=\"350\" y=\"118\" fill=\"#FFFFFF\" font-size=\"10.5\" font-style=\"italic\" text-anchor=\"middle\">holds the API key<\/text>\n<rect x=\"510\" y=\"78\" width=\"150\" height=\"60\" rx=\"10\" fill=\"#FFFFFF\"\/>\n<text x=\"585\" y=\"100\" fill=\"#1A1B2E\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">Ethereum API<\/text>\n<text x=\"585\" y=\"118\" fill=\"#888780\" font-size=\"11\" font-style=\"italic\" text-anchor=\"middle\">data and writes<\/text>\n<line x1=\"195\" y1=\"108\" x2=\"265\" y2=\"108\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" marker-end=\"url(#ethAr6)\"\/>\n<line x1=\"430\" y1=\"108\" x2=\"500\" y2=\"108\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" marker-end=\"url(#ethAr6)\"\/>\n<text x=\"350\" y=\"172\" fill=\"#FFFFFF\" font-size=\"10.5\" font-style=\"italic\" text-anchor=\"middle\">The frontend never sees the API key.<\/text>\n<\/svg><\/p>\n<p>A safe setup keeps the key on your server. Your frontend asks your backend for data. Your backend calls the Ethereum API with the key. It returns clean values to the frontend. The frontend never sees the key.<\/p>\n<p><strong>A short safety checklist:<\/strong><\/p>\n<ul>\n<li>Keep API keys on the server, never in client apps.<\/li>\n<li>Sign transactions in a secure place, ideally a hardware wallet.<\/li>\n<li>Preview or simulate a transaction before you send it.<\/li>\n<li>Set spending limits and alerts on each key.<\/li>\n<li>Rotate keys after staff changes or a suspected leak.<\/li>\n<\/ul>\n<h2 id=\"s10\">Rate limits, credits, and pricing<\/h2>\n<p>Providers price access in a few common ways. Some count requests per second. Some count requests per month. Many use credits, where heavy methods cost more.<\/p>\n<p>A simple balance read is cheap. A wide log query is not. Scanning many blocks costs more credits. Plan for your real traffic, not a demo.<\/p>\n<p>Free tiers are great for testing. They run out under real load. Check the next tier before you build. A steep jump can surprise a growing app.<\/p>\n<p>Model a busy month, not a quiet one. Add headroom for growth and traffic spikes.<\/p>\n<h2 id=\"s11\">How to choose your Ethereum API<\/h2>\n<p>A few factors separate a good fit from a bad one. Weigh them against your roadmap.<\/p>\n<div class=\"cs-factor-grid\">\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:10px;\">Chain coverage<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">Ethereum only, or Ethereum plus Base, Arbitrum, and Optimism.<\/div>\n<\/div>\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:10px;\">Token and asset support<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">Clean balances, decimals, metadata, and ERC-1155 handling.<\/div>\n<\/div>\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:10px;\">Real-time path<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">WebSocket support for live blocks and contract events.<\/div>\n<\/div>\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:10px;\">Data depth<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">History, decoded logs, and older state when you need it.<\/div>\n<\/div>\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:10px;\">Pricing clarity<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">Simple limits, readable credits, and no surprise tiers.<\/div>\n<\/div>\n<div style=\"background:#FFFFFF;border:0.7px solid #9E9AAE;border-radius:14px;padding:18px;\">\n<div style=\"font-size:15px;font-weight:700;color:#0E0E10;margin-bottom:10px;\">Docs and support<\/div>\n<div style=\"font-size:13.5px;color:#1F2024;line-height:1.6;\">Working examples, clear errors, and a public status page.<\/div>\n<\/div>\n<\/div>\n<div style=\"background:#FFF9F5;border:2px solid #F355BD;border-radius:14px;padding:18px 22px;margin:28px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n<div style=\"font-size:11px;font-weight:800;letter-spacing:1.4px;text-transform:uppercase;color:#F355BD;margin-bottom:8px;\">Before you commit, confirm<\/div>\n<div style=\"font-size:14.5px;color:#0E0E10;line-height:1.65;\">\n<ul style=\"margin:0;padding-left:20px;\">\n<li>It supports every chain your users care about.<\/li>\n<li>It returns decoded token balances, not just raw RPC.<\/li>\n<li>It can handle your expected request volume.<\/li>\n<li>It supports WebSockets when you need live updates.<\/li>\n<li>It has clear pricing for heavy methods.<\/li>\n<li>You can export data or switch providers later.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<h2 id=\"s12\">Common mistakes to avoid<\/h2>\n<ol>\n<li><strong>Polling for prices every second.<\/strong> Fix it by subscribing over WebSocket instead.<\/li>\n<li><strong>Showing token balances without decimals.<\/strong> Fix it by reading decimals and formatting the amount.<\/li>\n<li><strong>Ignoring ERC-1155 tokens.<\/strong> Fix it by querying that standard too.<\/li>\n<li><strong>Querying huge block ranges for logs.<\/strong> Fix it by splitting into smaller windows and checkpointing.<\/li>\n<li><strong>Forgetting Layer 2 networks.<\/strong> Fix it by adding Base, Arbitrum, and Optimism.<\/li>\n<li><strong>Sending transactions without checking gas.<\/strong> Fix it by reading current fees first.<\/li>\n<li><strong>Choosing on the free tier alone.<\/strong> Fix it by checking the next paid tier early.<\/li>\n<li><strong>Hard-coding one provider.<\/strong> Fix it by adding a backup with failover.<\/li>\n<\/ol>\n<h2 id=\"s13\">Examples of Ethereum API providers<\/h2>\n<p>The table below is not a ranking. Each provider gets the same columns. Verify the details that matter for your app.<\/p>\n<div style=\"background:#FFF9F5;border:2px solid #F355BD;border-radius:14px;padding:18px 22px;margin:24px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n<div style=\"font-size:11px;font-weight:800;letter-spacing:1.4px;text-transform:uppercase;color:#F355BD;margin-bottom:8px;\">Disclosure<\/div>\n<div style=\"font-size:14.5px;color:#0E0E10;line-height:1.65;\">We make this guide, so we kept the comparison honest. Each provider is matched to a use case, not ranked.<\/div>\n<\/div>\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;\">\n<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%,#E043B2 100%);\">Best known for<\/th>\n<th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg,#E043B2 0%,#EF4997 100%);\">Useful when<\/th>\n<th style=\"border:none;text-align:left;padding:12px 14px;font-weight:700;color:#FFFFFF;background:linear-gradient(90deg,#EF4997 0%,#FF4F7C 100%);\">Check before choosing<\/th>\n<\/tr>\n<\/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;\"><a href=\"https:\/\/coinstats.app\/api-docs\/wallet\/ethereum-evm\/\">CoinStats Ethereum API<\/a><\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">All-in-one wallet, token, and DeFi data<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">You want clean data without running nodes<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Exact chain list, endpoints, and limits<\/td>\n<\/tr>\n<tr style=\"border:none;background:#22233A;\">\n<td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Infura<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Reliable Ethereum RPC at scale<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">You need dependable node access<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Per-method credit weights and limits<\/td>\n<\/tr>\n<tr style=\"border:none;background:#1A1B2E;\">\n<td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Etherscan API<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Explorer data: balances, transactions, and logs<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">You want quick reads and contract data<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Rate limits and endpoint coverage<\/td>\n<\/tr>\n<tr style=\"border:none;background:#22233A;\">\n<td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">The Graph<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Indexed onchain data through subgraphs<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">You query history and events often<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Subgraph availability and query costs<\/td>\n<\/tr>\n<tr style=\"border:none;background:#1A1B2E;\">\n<td style=\"border:none;padding:14px 16px;color:#FFFFFF;font-weight:700;\">Ankr<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Multichain RPC with a free tier<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">You want a low-cost backup endpoint<\/td>\n<td style=\"border:none;padding:14px 16px;color:#A8A4B8;\">Chain coverage and rate limits<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h2 id=\"s14\">Your first Ethereum API call<\/h2>\n<p>Here is a friendly first call. It reads a <a href=\"https:\/\/coinstats.app\/blog\/crypto-wallet-api\/\">wallet balance<\/a>. Swap in your own host, key, and address.<\/p>\n<pre><code>async function getBalance(address) {\n  try {\n    const res = await fetch(\"https:\/\/api.example.com\/v1\/ethereum\", {\n      method: \"POST\",\n      headers: {\n        \"Content-Type\": \"application\/json\",\n        \"X-API-KEY\": \"YOUR_KEY\",\n      },\n      body: JSON.stringify({\n        jsonrpc: \"2.0\",\n        id: 1,\n        method: \"eth_getBalance\",\n        params: [address, \"latest\"],\n      }),\n    });\n    if (!res.ok) throw new Error(\"HTTP \" + res.status);\n    const data = await res.json();\n    return data.result;\n  } catch (err) {\n    console.error(\"getBalance failed\", err);\n    return null;\n  }\n}<\/code><\/pre>\n<p>In production, also handle timeouts, retries, and rate limits. Convert wei to ETH before you show it.<\/p>\n<p>Here is a small helper for that conversion.<\/p>\n<pre><code>function weiHexToEth(hexWei) {\n  return Number(BigInt(hexWei)) \/ 1e18;\n}<\/code><\/pre>\n<p>This is fine for learning. For production, use a big-number library. Plain numbers lose precision on large balances.<\/p>\n<div style=\"background:#1A1B2E;border-radius:14px;padding:22px 26px;margin:28px 0;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n<div style=\"font-size:11px;font-weight:800;letter-spacing:1.4px;text-transform:uppercase;color:#F355BD;margin-bottom:10px;\">Do not<\/div>\n<div style=\"font-size:14.5px;color:#FFFFFF;line-height:1.65;\">\n<ul style=\"margin:0;padding-left:20px;\">\n<li>Do not put API keys in mobile or browser code.<\/li>\n<li>Do not poll balances in a tight loop, subscribe instead.<\/li>\n<li>Do not show raw wei to users, convert it first.<\/li>\n<li>Do not assume one provider covers every chain you need.<\/li>\n<li>Do not skip error handling on a failed call.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<h2 id=\"s15\">Best practices on Ethereum<\/h2>\n<ol>\n<li><strong>Cache token metadata.<\/strong> Names, symbols, and decimals rarely change.<\/li>\n<li><strong>Batch reads where you can.<\/strong> Fewer calls means lower cost.<\/li>\n<li><strong>Subscribe for live data.<\/strong> Replace tight polling with WebSocket events.<\/li>\n<li><strong>Read gas fees before sending.<\/strong> Pick a fee that lands reliably.<\/li>\n<li><strong>Decode logs once.<\/strong> Store the clean fields you need.<\/li>\n<li><strong>Handle reorgs.<\/strong> Recent blocks can change, so confirm before trusting.<\/li>\n<li><strong>Cover Layer 2 networks.<\/strong> Users hold tokens beyond mainnet.<\/li>\n<li><strong>Run a backup provider.<\/strong> Failover keeps your app online.<\/li>\n<\/ol>\n<h2 id=\"s16\">The future: smart accounts and AI<\/h2>\n<p><svg viewBox=\"0 0 700 200\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"An AI agent reads Ethereum data through an MCP server\" style=\"width:100%;height:auto;margin:18px 0 24px 0;display:block;font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;\">\n<defs><linearGradient id=\"ethG5\" x1=\"0%\" y1=\"0%\" x2=\"100%\" y2=\"0%\"><stop offset=\"0%\" stop-color=\"#C238E8\"\/><stop offset=\"100%\" stop-color=\"#FF4F7C\"\/><\/linearGradient><marker id=\"ethAr5\" 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><\/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\">AI AGENTS READ ONCHAIN DATA<\/text>\n<rect x=\"40\" y=\"78\" width=\"150\" height=\"60\" rx=\"10\" fill=\"#FFFFFF\"\/>\n<text x=\"115\" y=\"100\" fill=\"#1A1B2E\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">AI agent<\/text>\n<text x=\"115\" y=\"118\" fill=\"#888780\" font-size=\"11\" font-style=\"italic\" text-anchor=\"middle\">calls tools by name<\/text>\n<rect x=\"275\" y=\"78\" width=\"150\" height=\"60\" rx=\"10\" fill=\"url(#ethG5)\"\/>\n<text x=\"350\" y=\"100\" fill=\"#FFFFFF\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">MCP Server<\/text>\n<text x=\"350\" y=\"118\" fill=\"#FFFFFF\" font-size=\"10.5\" font-style=\"italic\" text-anchor=\"middle\">read-only by default<\/text>\n<rect x=\"510\" y=\"78\" width=\"150\" height=\"60\" rx=\"10\" fill=\"#FFFFFF\"\/>\n<text x=\"585\" y=\"100\" fill=\"#1A1B2E\" font-size=\"13\" font-weight=\"700\" text-anchor=\"middle\">Ethereum data<\/text>\n<text x=\"585\" y=\"118\" fill=\"#888780\" font-size=\"11\" font-style=\"italic\" text-anchor=\"middle\">wallets, tokens, DeFi<\/text>\n<line x1=\"195\" y1=\"108\" x2=\"265\" y2=\"108\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" marker-end=\"url(#ethAr5)\"\/>\n<line x1=\"435\" y1=\"108\" x2=\"500\" y2=\"108\" stroke=\"#A8A4B8\" stroke-width=\"1.5\" marker-end=\"url(#ethAr5)\"\/>\n<text x=\"350\" y=\"172\" fill=\"#FFFFFF\" font-size=\"10.5\" font-style=\"italic\" text-anchor=\"middle\">An MCP server turns an Ethereum API into agent tools.<\/text>\n<\/svg><\/p>\n<p>Ethereum keeps getting easier to build on. Two shifts matter most for apps.<\/p>\n<h3>Smart accounts<\/h3>\n<p>The <a href=\"https:\/\/blog.ethereum.org\/2025\/04\/23\/pectra-mainnet\">Pectra upgrade<\/a> went live in May 2025. It brought smart accounts through a rule called <a href=\"https:\/\/eips.ethereum.org\/EIPS\/eip-7702\">EIP-7702<\/a>. A normal wallet can now batch actions and sponsor gas. Apps can hide some friction from users.<\/p>\n<p>The <a href=\"https:\/\/blog.ethereum.org\/2025\/11\/06\/fusaka-mainnet-announcement\">Fusaka upgrade<\/a> followed in December 2025. It expands data space for Layer 2 networks. Fees on rollups trend lower over time. More users will hold tokens across many chains.<\/p>\n<h3>AI agents<\/h3>\n<p>AI agents are the next big reader of chain data. They call tools instead of reading docs. An MCP Server turns an Ethereum API into agent tools. Read-only defaults keep the blast radius small.<\/p>\n<p>For example, <a href=\"https:\/\/coinstats.app\/api-docs\/\">CoinStats Crypto API<\/a> ships an <a href=\"https:\/\/coinstats.app\/api-docs\/mcp\/connecting\/\">MCP Server<\/a>. It exposes wallet, token, and DeFi data to agents. Other providers are moving the same way.<\/p>\n<h2 id=\"s17\">Conclusion<\/h2>\n<p>An Ethereum API turns a complex chain into simple requests. You read balances, tokens, events, and history without a node. A good provider hides the plumbing, not the choices.<\/p>\n<p>Start with the data your app truly needs. Most apps begin with balances and tokens. Add events when you need history or alerts. Add writes only when you send transactions.<\/p>\n<p>Then pick a provider that fits your chains and budget. Test it against real traffic, not a demo. The one whose limits and coverage match your numbers wins.<\/p>\n<h2 id=\"faq\">Frequently asked questions<\/h2>\n<div class=\"cs-faq\">\n<details>\n<summary>What is an Ethereum API?<\/summary>\n<div class=\"cs-faq-body\">\n<p>An Ethereum API is a hosted gateway to the Ethereum blockchain. It lets apps read data and send transactions without running a node. Most reads use a standard called JSON-RPC and return JSON.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>What is JSON-RPC?<\/summary>\n<div class=\"cs-faq-body\">\n<p>JSON-RPC is the request format Ethereum nodes accept. You send a method name and parameters. The node returns a JSON result. Methods include eth_getBalance and eth_getLogs.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>What is the difference between ERC-20 and ERC-721?<\/summary>\n<div class=\"cs-faq-body\">\n<p>ERC-20 is for fungible tokens, where every unit is identical. ERC-721 is for NFTs, where each token is unique. ERC-1155 can mix both inside one contract.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>What are event logs?<\/summary>\n<div class=\"cs-faq-body\">\n<p>Logs are records that contracts emit during actions. A token transfer emits a Transfer log. Apps read logs to build history, alerts, and analytics.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How do I read a wallet&#8217;s tokens?<\/summary>\n<div class=\"cs-faq-body\">\n<p>You query token balances by the wallet address. A token-aware API returns balances with decimals and symbols. That turns raw numbers into readable amounts.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>What is gas on Ethereum?<\/summary>\n<div class=\"cs-faq-body\">\n<p>Gas is the cost of the work a transaction needs. You pay it in ETH. Since 2021, fees have a base fee and a priority tip.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Do I need to run a node?<\/summary>\n<div class=\"cs-faq-body\">\n<p>No. An Ethereum API runs nodes for you. You call a managed endpoint with an API key. This skips syncing and maintenance.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Is an Ethereum API safe for transactions?<\/summary>\n<div class=\"cs-faq-body\">\n<p>Reads need only a key. For writes, you sign on your side first. The provider relays the signed transaction. It never holds your private key.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>Does an Ethereum API work on Layer 2?<\/summary>\n<div class=\"cs-faq-body\">\n<p>Many do. Base, Arbitrum, and Optimism use the same EVM rules. One EVM-ready API can read tokens and events across them.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>What is the difference between REST and WebSocket here?<\/summary>\n<div class=\"cs-faq-body\">\n<p>REST suits one-off reads like balances and history. WebSocket pushes live updates like new blocks. Many apps use both together.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>What is an archive node?<\/summary>\n<div class=\"cs-faq-body\">\n<p>An archive node stores full historical state. It can answer questions about old balances and contract state. Some providers expose archive data on higher tiers.<\/p>\n<\/div>\n<\/details>\n<details>\n<summary>How much does an Ethereum API cost?<\/summary>\n<div class=\"cs-faq-body\">\n<p>Pricing varies by provider and usage. Many offer a free tier for testing. Heavy methods and large queries cost more. Model a busy month before you commit.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<div 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;box-shadow:0 12px 32px -8px rgba(243,85,189,0.35);\">\n<div style=\"font-size:24px;font-weight:800;margin-bottom:12px;letter-spacing:-0.3px;\">Read Ethereum data with one API<\/div>\n<div style=\"font-size:15px;line-height:1.65;opacity:0.98;margin-bottom:22px;\">Balances, tokens, transactions, and DeFi across Ethereum and its Layer 2 networks. REST and an MCP Server, with a free tier.<\/div>\n<p><a href=\"https:\/\/coinstats.app\/api-docs\/wallet\/ethereum-evm\/\" style=\"display:inline-block;background:#FFFFFF;color:#E5358C;font-weight:800;font-size:14.5px;padding:14px 28px;border-radius:10px;text-decoration:none!important;letter-spacing:0.2px;\">Explore the Ethereum API docs &rarr;<\/a>\n<\/div>\n<div style=\"margin:36px 0 24px 0;padding-top:18px;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, investment, or legal advice. Ethereum tools and providers change fast. Verify each provider&#8217;s docs before you build.<\/div>\n<\/div>\n<p><script>(function(){var nav=document.querySelector(\".cs-toc-fixed\");if(!nav)return;var links=[].slice.call(nav.getElementsByTagName(\"a\"));var map=[];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});}});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\");}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-90,behavior:\"smooth\"});}});});window.addEventListener(\"scroll\",up,{passive:true});window.addEventListener(\"resize\",up);up();})();<\/script>\n","protected":false},"excerpt":{"rendered":"<p>In this guide What an Ethereum API actually means Quick decision table The kinds of data you can read Tokens: ERC-20, ERC-721, ERC-1155 Event logs: the chain&#8217;s activity feed Transactions, gas, and fees Common Ethereum API use cases Anatomy of an Ethereum API call How apps connect to Ethereum API vs node provider vs indexer Reading, writing, and staying safe Rate limits, credits, and pricing How to choose your Ethereum API Common mistakes to avoid Examples of Ethereum API providers Your first Ethereum API call Best practices on Ethereum The future: smart accounts and AI Conclusion FAQ On this page [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":20933,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"wl_entities_gutenberg":"","inline_featured_image":false,"footnotes":""},"categories":[412],"tags":[417,414,415,416,413],"wl_entity_type":[314],"ppma_author":[364],"class_list":["post-20685","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-crypto-api","tag-blockchain-development","tag-ethereum-api","tag-json-rpc","tag-web3-api","tag-whats-is-ethereum-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>Whats Is Ethereum API? 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