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.