x402 risk-check provider: signed pre-payment verdicts — OFAC, phishing feeds, transaction simulation, drainer-kit code, and our own EIP-7702 kit watch (poisoners, sweepers). $0.001 per check with prep
x402check — pre-payment risk checks for x402 agents and wallets
LIVE: https://x402check.xyz · did:web:x402check.xyz · $0.001 per evaluation with prepaid credits, or per call via x402 ($0.0035 on Base; $0.005 with transaction simulation) · discovery · DID document · JWKS
x402check is an x402 risk-check provider (wire format of x402 PR 2422). You call it before an agent or a wallet pays or signs, and it checks the counterparty. It combines provider-verified evidence with a typed model:
- the OFAC SDN list, refreshed daily; - curated phishing and drainer feeds; - transaction simulation: where the assets actually go, and which approvals are granted; - drainer-kit code fingerprints, which recognize redeployed drainer contracts before their address is listed; - our own kit watch: every Ethereum and Base block is read as it is produced. It records look-alike wallets that delegate (EIP-7702) to an address-poisoning executor, wallets whose delegate forwards whatever they receive (sweepers), and new contracts running drainer-kit code; - look-alike domain analysis; - on-chain facts about the counterparty, such as whether an approval is being granted to a plain wallet; - a typed model (TypeSafe Jev) that reads the content the agent acted on for injected instructions.
Every verdict is an ES256 attestation. It states which checks the provider actually ran and which fields the caller merely asserted.
From the project README.
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