# DevX Address Poisoning Check
> Before an agent or wallet sends crypto, check the recipient for address poisoning: lookalike of someone the sender really pays, planted by zero-value/dust/fake-token transfers. Free offline lookalike check; paid on-chain check 0.005 USDC via x402 on Base.
- Free API: GET /api/basic?to=0x...&known=0x...,0x...
- Paid API (x402): GET /v1/check?from=0x...&to=0x...[&chains=ethereum,base,avalanche]
- MCP: https://address-poisoning-check.nextill-pos.workers.dev/mcp
- OpenAPI: /openapi.json
- Source: https://github.com/devx-agent/address-poisoning-check
- Related: https://sweeper-check.nextill-pos.workers.dev (EIP-7702 sweeper check), https://crypto-link-check.nextill-pos.workers.dev (phishing link check), https://tokencheck.madebydevx.com (token check)