Aptos (APT) Cryptocurrency: Comprehensive Overview
Core Technology and Blockchain Architecture
Aptos is a Layer 1 proof-of-stake blockchain engineered for high throughput, low latency, and parallel transaction execution. Built by former Meta engineers who previously worked on the Diem blockchain project, Aptos combines three foundational technical innovations: the Move smart contract language, the Block-STM parallel execution engine, and the AptosBFT consensus protocol.
Move Smart Contract Language
Move is a resource-oriented programming language originally developed by Meta for the Diem project and subsequently adopted as Aptos' native smart contract runtime. Unlike traditional smart contract languages, Move treats digital assets as first-class resources that cannot be accidentally duplicated or destroyed. This design philosophy significantly reduces common vulnerability classes in blockchain applications. The language is paired with the Move Prover and Move Specification Language, enabling formal verification of contract behavior before deployment. This focus on safety and asset integrity represents a fundamental architectural advantage over EVM-based chains, where asset handling relies on developer discipline rather than language-level guarantees.
Block-STM Parallel Execution Engine
Aptos' execution layer uses Block-STM, a speculative parallel execution framework that fundamentally changes how transactions are processed. Rather than executing transactions sequentially (as most blockchains do), Block-STM attempts to execute independent transactions concurrently. When conflicts are detected, only the conflicting transactions are re-executed, while non-conflicting transactions continue uninterrupted. This approach dramatically improves throughput compared to sequential execution models. Aptos' technical materials cite benchmark claims reaching 160,000+ transactions per second under favorable conditions, though real-world sustained throughput depends on transaction composition and network load.
AptosBFT Consensus Protocol
Aptos employs AptosBFT, a Byzantine fault-tolerant consensus protocol derived from the DiemBFT lineage. The protocol is designed to tolerate up to one-third of validators being malicious or offline while maintaining network security and liveness. Critically, Aptos separates the consensus layer (which orders transactions) from the execution layer (which processes them), allowing these functions to be optimized independently. This modular design enables fast finality with sub-second confirmation times, a significant advantage for payment and trading applications.
Modular Architecture
The protocol's modular design separates consensus, execution, storage, and networking components. This separation allows protocol upgrades and performance improvements without requiring disruptive hard forks. Validator nodes order transactions through consensus, execute them in parallel, and commit results to the ledger. Fullnodes can independently re-execute transactions and verify history, adding an additional verification layer that strengthens the network's ability to detect and prevent invalid state transitions.
Primary Use Cases and Real-World Applications
Aptos positions itself as infrastructure for decentralized applications across multiple domains, with particular strength in payments, DeFi, and tokenized assets.
Stablecoins and Payments
Aptos has emerged as a major stablecoin hub, with native deployments of the three largest stablecoins:
- USDT launched natively on Aptos in October 2024, reaching a supply of $680 million
- USDC followed in January 2025, achieving a market cap of $295 million
- USDe (Ethena's stablecoin) was bridged in February 2025
This "stablecoin trifecta" positions Aptos as a preferred settlement layer for payments and trading. The combination of low fees, fast finality, and high throughput makes Aptos particularly suitable for merchant payments, cross-border transfers, and institutional settlement.
Decentralized Finance (DeFi)
The Aptos DeFi ecosystem experienced substantial growth in 2024–2025:
- Total Value Locked (TVL) surpassed $1.03 billion in March 2025 and remained above $1 billion through H1 2025
- Decentralized exchange (DEX) volume reached $9.0 billion in Q2 2025
- Hyperion (a perpetuals platform) achieved $5.4 billion in volume, representing 29x quarter-over-quarter growth
- ThalaSwap V2 (an AMM) quadrupled volume to $2.9 billion
- Aries Markets (a lending protocol) accumulated over $400 million in stablecoin deposits
- Echelon (a lending platform) managed $200+ million in TVL with sUSDe deposits exceeding $90 million
- Aave V3 deployment on Aptos in 2025 represented a major milestone for institutional DeFi infrastructure
These metrics demonstrate that Aptos has successfully attracted both retail and institutional DeFi activity, with particular strength in stablecoin lending, perpetuals trading, and liquidity provision.
Real-World Assets (RWAs) and Tokenized Finance
Aptos has become a notable platform for tokenized assets and structured finance:
- $723 million in RWA value issued on-chain (per one source)
- $349 million in tokenized assets (per another source)
- BlackRock's BUIDL (a tokenized money market fund) deployment on Aptos in 2024–2025 represented a major institutional milestone
- Aptos is ranked among the highest-maturity Layer 1 blockchains for RWA infrastructure
The combination of stablecoin liquidity, institutional partnerships, and regulatory clarity around tokenized assets positions Aptos as a preferred chain for enterprise tokenization projects.
Gaming and Consumer Applications
Aptos supports gaming and entertainment use cases through:
- Partnerships with Google Cloud for Web3 gaming infrastructure
- NBCUniversal collaboration for fan experiences and entertainment applications
- Native support for NFTs and digital collectibles
- Consumer-focused wallet infrastructure and account abstraction improvements
AI and Next-Generation Applications
Aptos' official positioning emphasizes AI-native and data-intensive applications, with infrastructure designed to support:
- On-chain data querying and indexing
- Decentralized cloud-grade storage (e.g., Shelby)
- AI-assisted developer tools and smart contract composition
- Data-intensive consumer applications
Founding Team, Key Developers, and Project History
Co-Founders
Mo Shaikh — Co-Founder and Former CEO
Mo Shaikh is a three-time founder with deep expertise in product development, fundraising, and scaling technology businesses. Before co-founding Aptos Labs in December 2021, Shaikh served as Director of Strategy at ConsenSys, where he focused on blockchain infrastructure, growth, capital allocation, and venture incubation. His background spans capital markets, private equity, venture capital, and strategic partnerships. As CEO, Shaikh oversaw Aptos Labs' overall strategy, investor relations, and ecosystem growth. In December 2024, he transitioned from the CEO role and subsequently co-founded Maximum Frequency Ventures (MFV) as a General Partner, reflecting his continued involvement in Web3 investment.
Avery Ching — Co-Founder and Current CEO
Avery Ching brings over 21 years of engineering and technical leadership experience to Aptos. He served as Co-Founder and CTO from December 2021 through December 2024, at which point he transitioned into the CEO role. Before Aptos, Ching was the technical lead of the crypto platform team at Novi (Meta's digital payments division), where his group was responsible for all aspects of blockchain technology, from wallet infrastructure to Layer 1 blockchain development. He was a named maintainer of the Diem blockchain and led the design and implementation of Diem's two-chain consensus protocol, which featured optimistic responsiveness and liveness optimizations for crash fault tolerance within a Byzantine fault-tolerant setting. Ching's deep technical roots in distributed systems, consensus mechanisms, and blockchain infrastructure make him the primary technical architect behind Aptos' core design.
Founding Engineering Team
The founding engineering cohort includes several engineers who collaborated at Meta/Novi/Diem before joining Aptos:
Rustie Lin — Founding Engineer & Head of Production Engineering
Rustie Lin joined Aptos Labs as a founding engineer in February 2022 and leads the Production Engineering function. His responsibilities include launching Aptos' devnet, testnet, three incentivized testnets, and mainnet. Lin focuses on testing and CI/CD at scale, analytics, observability, operations, data infrastructure, and working with node operators to strengthen network security.
Sherry Xiao — Founding Engineer, Production Engineering
Sherry Xiao leads production infrastructure for Aptos Networks. Prior to Aptos, she was a Production Engineer at Novi (Meta), where she led production readiness efforts for the Diem Blockchain across observability, debuggability, disaster recovery, and incident response. Before her blockchain work, Xiao was a technical lead at Instagram, where she worked on scaling the Django web server fleet and Cassandra database clusters.
Josh Lind — Founding Engineer
Josh Lind is a founding software engineer focused on Layer 1 blockchain technology. Before Aptos, he was a Research Scientist at Novi (Meta) working on the Diem blockchain. Lind holds a PhD from Imperial College London, earned within the Large-scale Data and Systems group and the Centre for Cryptocurrency Research and Engineering. His doctoral research focused on improving the security and privacy of large-scale distributed systems using trusted hardware, and he was the primary author of the Teechain Network, a secure high-performance off-chain payment network for blockchains.
Greg Nazario — Founding Engineer
Greg Nazario is a founding software engineer with over 10 years of experience building large-scale distributed systems. He has worked on the Diem and Aptos blockchains for over four years, contributing across the full stack: REST APIs, client SDKs, developer tools, Move language development, networking, developer relations, and developer education.
Security and Infrastructure Leadership
Andrea C. — Security Lead
Andrea C. leads the security function at Aptos Labs, overseeing smart contract, core blockchain, application, and infrastructure security. Responsibilities include managing third-party audit programs, owning incident response and bug bounty triage, and overseeing security automation across EDR, SAST, CNAPP, and CI/CD integration. Technically, Andrea has built LibAFL and scenario-based transaction fuzzers for the Move VM.
Mathieu Degaugue — Infrastructure Security Lead
Mathieu Degaugue brings over 12 years of cybersecurity experience to his role as Infrastructure Security Lead at Aptos Labs.
Project History and Timeline
Aptos Labs was founded in December 2021 by a cohort of engineers and researchers who had worked together at Meta's Novi Financial and on the Diem blockchain project. When Meta shut down the Diem Association in early 2022 and sold its assets, the core technical team regrouped under the Aptos Labs banner, bringing years of collaborative work on Move, Block-STM, and DiemBFT.
Key milestones include:
- January 2022: Aptos Labs founded
- February 24, 2022: Aptos introduced publicly in "The Genesis of Aptos"
- March 2022: Series A funding round of $200 million from investors including Andreessen Horowitz (a16z), Multicoin Capital, Coinbase Ventures, FTX Ventures, and others
- July 2022: Series B funding round of $150 million led by FTX Ventures and Jump Crypto, with participation from Apollo Global Management, Franklin Templeton, Griffin Gaming Partners, and others
- October 12, 2022: Aptos mainnet launch
- October 2022: APT token launch alongside mainnet
- August 2023: Partnership with Microsoft
- November 2023: Partnership with Google Cloud and Alibaba Cloud
- March 2024: Google Cloud gaming partnership
- April 2024: Aptos Ascend launched with Microsoft, Brevan Howard, and SK Telecom
- June 2024: NBCUniversal partnership strengthened
- October 2024: Aptos-native USDT launched; HashPalette acquisition and Japan expansion
- December 2024: Avery Ching became CEO of Aptos Labs
- January 2025: Aptos-native USDC launched
- February 2025: USDe bridged to Aptos
- March 2025: TVL surpassed $1.03 billion
- April 2025: Aptos Labs published "Building the Global Trading Engine" roadmap
- Q2 2025: DEX volume reached $9.0 billion
Aptos Labs has raised over $400 million in total funding and employs between 51 and 200 people across engineering, research, business development, security, and ecosystem roles.
Tokenomics: Supply, Distribution, and Mechanics
Supply Structure
APT is the native token of the Aptos network, used for transaction fees, staking, governance, and ecosystem incentives.
Current Market Data (as of May 1, 2026):
- Price: $1.0378
- Market cap: $837.5 million
- Market cap rank: 79
- 24-hour trading volume: $103.0 million
- Circulating supply: 807,012,715 APT (approximately 807 million)
- Total supply: 1,202,001,909 APT (approximately 1.202 billion)
- Fully diluted valuation (FDV): $1.247 billion
- Decimals: 18
The gap between circulating supply and total supply reflects ongoing token unlocks from vesting schedules. The FDV of $1.247 billion indicates that the market has already priced in substantial future supply dilution.
Initial Distribution
Aptos launched with a fixed initial supply of 1 billion APT tokens, distributed as follows:
- Community: 51.02% (510,217,359.767 APT)
- Core contributors: 19.00% (190,000,000 APT)
- Foundation: 16.50% (165,000,000 APT)
- Investors: 13.48% (134,782,640.233 APT)
This distribution heavily favors community incentives and ecosystem growth, with core contributors and investors subject to longer lock-up periods.
Vesting and Unlock Mechanics
The token distribution is designed with staged vesting schedules:
- Community and foundation allocations: Released over 10 years
- Core contributors and investors: Subject to a 4-year lock-up from mainnet launch (October 2022), with early unlocks and monthly vesting schedules applying after the initial lock period
- Staking rewards: Separate from vesting restrictions and can be earned by stakers immediately upon participation
This structure creates ongoing dilution pressure as additional tokens enter circulation over time. The 10-year community vesting schedule means that community tokens will continue to unlock through October 2032, providing long-term incentive alignment but also creating sustained supply pressure.
Inflation and Deflation Mechanics
Aptos uses a staking-reward model to incentivize network security, which introduces inflationary issuance. At the same time, transaction fees are paid in APT and historically have been burned, creating some fee-based deflationary pressure. The net effect depends on staking participation rates, transaction fee activity, and the magnitude of unlock schedules.
Recent official ecosystem news in 2026 indicates the network is transitioning to "performance-driven tokenomics," suggesting a shift toward supply mechanics that reward network performance and usage rather than purely inflationary staking rewards. However, the exact implications of this transition should be read from official Aptos tokenomics updates rather than third-party summaries.
Staking and Network Economics
As of Q2 2025, the Aptos network had:
- 152 active validators
- 877.9 million APT staked
This represents approximately 73% of the circulating supply participating in staking, indicating strong validator participation and economic security backing the network.
Consensus Mechanism and Network Security Model
Aptos employs a proof-of-stake consensus model with validator staking and Byzantine fault tolerance.
AptosBFT Consensus Protocol
AptosBFT is a Byzantine fault-tolerant consensus protocol derived from the DiemBFT lineage. The protocol provides fault tolerance against up to one-third of malicious or faulty validators while maintaining network security and liveness. The consensus layer is designed to order blocks quickly, while execution is handled separately, improving throughput and latency relative to monolithic consensus designs.
Validator Staking and Economic Security
Network security is economically backed by staked APT. Validators stake APT to participate in block production and consensus. The staking mechanism creates economic incentives for validators to behave honestly, as malicious behavior results in slashing of staked tokens. The current staking base of 877.9 million APT (approximately 73% of circulating supply) demonstrates substantial economic commitment to network security.
Parallel Execution with Conflict Resolution
Block-STM enables concurrent transaction execution while preserving correctness. Conflicting transactions are re-executed, while non-conflicting transactions continue without interruption. This design maintains the safety guarantees of sequential execution while achieving the performance benefits of parallelism.
Move Language Safety
Move's resource model reduces certain classes of smart contract bugs by making asset handling a language-level concern rather than a developer responsibility. This reduces the attack surface for common vulnerabilities such as reentrancy, integer overflow, and unauthorized asset transfers.
Fullnode Verification
Fullnodes can independently re-execute transactions and verify history, adding an additional verification layer beyond validators. This strengthens the network's ability to detect foul play or attempted history rewrites, as any invalid state transition would be detected by fullnodes re-executing the transaction.
Key Partnerships and Ecosystem Integrations
Aptos has pursued a partnership-driven strategy across cloud infrastructure, finance, gaming, and consumer applications.
Cloud Infrastructure Partnerships
Microsoft: Partnership beginning in August 2023, with Aptos Ascend launched in April 2024 in collaboration with Microsoft, Brevan Howard, and SK Telecom. This initiative focuses on AI/Web3 integration and institutional finance applications.
Google Cloud: Partnership announced in November 2023, with a dedicated gaming collaboration launched in March 2024 to elevate Web3 gaming infrastructure and developer tooling.
Alibaba Cloud: Partnership announced in November 2023 to bolster Web3 accessibility across the Asia-Pacific region.
Financial and Institutional Partnerships
Brevan Howard: Collaboration on Aptos Ascend and institutional DeFi infrastructure.
SK Telecom: Partnership on Aptos Ascend and consumer/enterprise applications in South Korea.
BlackRock: BUIDL (a tokenized money market fund) deployment on Aptos in 2024–2025, representing a major institutional milestone for RWA infrastructure.
Chainlink: Integration for oracle services and price feeds.
Media and Entertainment
NBCUniversal: Long-term collaboration for fan experiences, entertainment use cases, and consumer applications.
Ecosystem Infrastructure
Aave: V3 deployment on Aptos in 2025, bringing institutional-grade lending infrastructure to the ecosystem.
MoonPay: Integration for fiat on-ramps and payment processing.
Bithumb: Listing of Aptos-native USDT, expanding accessibility in South Korean markets.
Bitwise: Inclusion and visibility in 2025 coverage, reflecting institutional investor interest.
Ecosystem Growth and Foundation Support
The Aptos Foundation funds grants, developer programs, and ecosystem growth initiatives. As of 2025, the foundation committed $200 million to ecosystem growth, with over 200 grants distributed to developers and projects. The ecosystem has grown to include 330+ projects across DeFi, gaming, payments, and consumer applications.
Competitive Advantages and Unique Value Proposition
Aptos differentiates itself through a combination of technical, architectural, and strategic advantages.
1. Move-Based Security Model
Move was designed specifically for safer asset handling than traditional smart contract languages. The resource-oriented programming model makes digital assets first-class language constructs that cannot be accidentally duplicated or destroyed. This reduces entire classes of vulnerabilities (reentrancy, integer overflow, unauthorized transfers) that plague EVM-based chains. While Sui also uses Move, Aptos' institutional positioning and partnership strategy create different market dynamics.
2. Parallel Execution with Block-STM
Block-STM enables concurrent transaction processing, a major performance differentiator. By executing non-conflicting transactions in parallel and re-executing only conflicting transactions, Aptos achieves significantly higher throughput than sequential execution models. This is a technical advantage that Solana (which uses sequential execution with optimistic concurrency) does not fully replicate, and it represents a fundamental architectural difference from most other Layer 1 blockchains.
3. Diem/Meta Technical Lineage
Aptos inherits research and engineering work from Meta's Diem project, one of the most ambitious blockchain engineering efforts ever attempted. The founding team's years of collaborative work on Move, Block-STM, and DiemBFT provide a strong technical foundation and institutional knowledge that newer Layer 1 projects lack.
4. Modular and Upgradeable Architecture
The protocol was built to support iterative improvements without requiring major redesigns or disruptive hard forks. This enables rapid protocol evolution and the ability to deploy performance improvements (such as Raptr, Shardines, and Consensus Observer) without network disruption.
5. Institutional and Enterprise Positioning
Unlike many Layer 1 blockchains that target retail speculation or specific use cases, Aptos has pursued a deliberate institutional strategy:
- Partnerships with Microsoft, Google Cloud, Alibaba Cloud, SK Telecom, and NBCUniversal
- BlackRock BUIDL deployment for tokenized assets
- Focus on stablecoins, payments, and settlement infrastructure
- Emphasis on regulatory clarity and institutional-grade infrastructure
This positioning attracts institutional capital and enterprise adoption, creating network effects that benefit the entire ecosystem.
6. Stablecoin and RWA Traction
Aptos has become a major stablecoin hub with native deployments of USDT, USDC, and USDe. The combination of stablecoin liquidity, institutional partnerships, and regulatory clarity positions Aptos as a preferred chain for enterprise tokenization and settlement. This creates a virtuous cycle: stablecoin liquidity attracts DeFi protocols, which attracts traders, which increases transaction volume and fee revenue.
7. Developer Tooling and Grants
The Aptos Foundation and Aptos Labs have invested heavily in developer experience:
- Over 200 grants distributed
- $200 million committed to ecosystem growth in 2025
- AI-assisted developer tools and smart contract composition
- Comprehensive SDKs and Move language extensions
- Gas sponsorship and payments grants for consumer onboarding
Competitive Positioning vs. Solana
Aptos is often positioned as a Solana competitor on speed and throughput, but with different technical foundations:
- Move vs. Rust: Move provides language-level asset safety; Rust relies on developer discipline
- Parallel execution: Block-STM enables true concurrent execution; Solana uses sequential execution with optimistic concurrency
- Institutional branding: Aptos emphasizes enterprise and institutional use cases; Solana has stronger retail and developer mindshare
- Developer scale: Solana has a more mature developer ecosystem; Aptos is growing rapidly but from a smaller base
Competitive Positioning vs. Sui
Aptos and Sui share Diem/Move roots, but differ in positioning:
- Institutional focus: Aptos emphasizes partnerships with Microsoft, Google Cloud, and BlackRock; Sui has pursued a more developer-first strategy
- Stablecoin and payments: Aptos has achieved greater traction in stablecoins and settlement; Sui has focused on gaming and consumer applications
- Enterprise partnerships: Aptos' partnership stack (Microsoft, Google Cloud, SK Telecom, NBCUniversal) is broader and more institutional
Current Development Activity and Roadmap Highlights
Aptos' 2025 roadmap and development narrative centered on performance improvements, developer experience, and ecosystem expansion.
Performance and Execution Improvements
Raptr / Baby Raptr: Consensus improvements designed to reduce block synchronization time and lower mainnet transaction latency by 10% to 50% depending on load.
Shardines: A proposed protocol upgrade to address blockchain execution bottlenecks through sharding, enabling further throughput improvements.
Consensus Observer: Reduces block synchronization time and can lower mainnet transaction latency by 10% to 50% depending on load.
On-Chain Scheduler: A roadmap item intended to improve transaction ordering and execution efficiency.
Developer Experience and Language Evolution
Move 2: Released in 2025, Move 2 represents significant language evolution with improved syntax, better error messages, and enhanced developer experience.
Account Abstraction: Improvements to account abstraction enable more flexible transaction authorization and reduce friction for users coming from traditional Web2 applications.
X-Chain Accounts: Arriving in the coming weeks (as of April 2025), X-Chain Accounts allow users to bring capital from other chains into Aptos more easily, reducing cross-chain friction.
Aptos Connect: Improvements to wallet integration and consumer onboarding.
Dynamic Script Composer: Tools for composing complex transactions and smart contract interactions without manual coding.
Infrastructure and Ecosystem Expansion
Global Trading Engine: Aptos Labs' April 2025 "Building the Global Trading Engine" initiative emphasizes:
- Stablecoin expansion and settlement infrastructure
- Institutional DeFi growth
- New trading primitives and order types
- Cross-chain capital integration
Confidential Transactions: Confidential transaction support on devnet, enabling privacy-preserving transactions for sensitive financial applications.
Code Loader V2: Move data-structure optimizations and improved smart contract loading.
Ecosystem Growth
As of 2025, the Aptos ecosystem includes 330+ projects across:
- DeFi (Aries Markets, Echelon, Hyperion, ThalaSwap, Merkle Trade, Kana Labs)
- Stablecoins (USDT, USDC, USDe)
- Payments and settlement
- RWA and tokenized finance
- Gaming and entertainment
- Infrastructure and data services
Market Performance and Risk Profile
Price Performance
APT has experienced significant price volatility since launch:
- All-time high: $19.84 on January 30, 2023
- All-time low: $0.00 on July 18, 2022 (likely a data artifact from early trading)
- Current price (May 1, 2026): $1.0378
- 1-year performance: Declined from $5.53 on May 2, 2025 to $1.04 on May 1, 2026 (approximately -81%)
- 7-day performance: +9.95%
- 24-hour performance: +2.35%
APT is trading far below its all-time high, reflecting a long-term drawdown from early-cycle peaks. However, recent 7-day and 24-hour gains indicate short-term recovery momentum.
Risk and Liquidity Profile
- Risk score: 52.2 (mid-range risk profile)
- Liquidity score: 50.1 (moderate liquidity)
- Volatility score: 8.46 (meaningful volatility)
These metrics suggest that APT has sufficient market depth to support active trading, but price swings remain significant. The token is neither a low-volatility blue-chip asset nor an extreme high-risk speculation.
Market Position
With a market cap of $837.5 million and rank 79 among all cryptocurrencies, Aptos maintains a substantial market position. The 24-hour trading volume of $103.0 million indicates active trading interest, though volume has fluctuated with broader market conditions.
Summary
Aptos is a technically sophisticated Layer 1 blockchain built around three core innovations: the Move smart contract language (designed for asset safety), the Block-STM parallel execution engine (enabling high throughput), and the AptosBFT consensus protocol (providing fast finality). Founded by former Meta/Diem engineers in December 2021, Aptos launched its mainnet in October 2022 and has since grown into a substantial ecosystem with 330+ projects, $1+ billion in DeFi TVL, and major institutional partnerships.
The project's value proposition rests on its technical architecture (safer smart contracts, parallel execution, modular design), institutional positioning (partnerships with Microsoft, Google Cloud, SK Telecom, BlackRock), and real-world traction (stablecoin hub, RWA infrastructure, DeFi growth). APT serves as the network's fee, staking, and governance asset, with 807 million circulating supply and 1.202 billion total supply.
The primary challenge facing Aptos is converting technical and partnership momentum into sustained developer growth and long-term user retention at scale. While the ecosystem has achieved impressive metrics in DeFi TVL, stablecoin adoption, and institutional partnerships, developer activity has fluctuated, and the project must continue demonstrating that its technical advantages translate into meaningful competitive advantages in real-world applications.