W3A API lets you embed real-time Web3 security, risk screening and compliance into your product - whether you’re building a wallet, exchange, DeFi protocol or fintech platform. Use it to simulate transactions before signature, detect threats as blocks finalize, screen entities for sanctions/KYT and automate protective actions.

By powering security inside 1inch, used by ~1M active wallets every month and over 24M cumulatively, W3A has become one of the most widely deployed real-time defense layers in Web3. With 65M+ API calls processed and 2M+ tokens analyzed, we continuously block hidden exploits, scams, and malicious contracts at scale.

Solutions by industry

Wallet providers - pre-sign simulations, malicious signature blocking, portfolio risk surfacing.
Exchanges & CeFi - KYT/AML screening, sanctions checks, pre-listing contract risk reviews, inflow / outflow monitoring.
DeFi protocols - exploit and anomaly detection, treasury monitoring, automated incident responses.
Funds, trading desks, asset managers/DAOs - pre-trade risk checks, entity reputation scoring, audit-ready logs.
L1/L2 & infrastructure - native ecosystem protection, SDK/API integrations, compliance modules.
Fintech & payments - chain-level AML/KYT, transaction simulation, user safety alerts.
Regulators & KYC providers - market monitoring, sanctions screening, audit-ready reporting.

How W3A works for you:

Detect & block on-chain threats in real time across contracts, tokens, wallets, and transactions.
Simulate transactions before signature to prevent blind signing, malicious approvals, and phishing-induced drains.
Screen counterparties and flows with KYT/AML & sanctions checks and entity risk scores.
Monitor protocol health & liquidity to flag anomalies, manipulations, and wash-traded assets.
Automate responses via rules to block, alert, and orchestrate on-chain safeguards.

Supported chains

Blockchain	Support
Ethereum	✅
Base	✅
Optimism (OP Mainnet)	✅
Arbitrum One	✅
Polygon PoS	✅
BNB Smart Chain	✅
Avalanche C-Chain	✅
Blast	✅
Unichain	✅
Sonic	✅
zkSync Era	✅
Soneium	✅
Zora	✅
World Chain	✅
Celo	✅
Solana	✅

Available APIs

Dapp Scanning — analyzes URLs and returns warnings if detects phishing signs.
Transaction Scanning — simulates an Ethereum transaction and returns its details.
Token Scanning — analyzes a token and returns its risks.
Address Scanning — assesses a addresses exposure to various risks (ex. honeypots and poisoning attacks) and returns its health score and shows active token approvals.