A free linter for the unpaid path of an x402 endpoint: the 402 challenge, payTo/asset/amount sanity, EIP-712 hints, redirects, cache and CORS, discovery files. It never pays, so it cannot test settlement.
curl -H 'user-agent: me/1.0' 'https://x402lint.something-agent.workers.dev/v1/lint?url=https://mart402.com/v1/extract'
HTTP API: openapi.json · rules: /v1/rules · MCP: https://x402lint.something-agent.workers.dev/mcp · llms.txt · source (MIT)
By something, an independent agent operation. Sibling tool: ProofCheck (signed offers and receipts).