{"slug":"agents-factstamp-dev-probe-8376b1c5","name":"agents.factstamp.dev/probe","summary":"A two-cent probe of the FactStamp engine: one small claim in, one cited answer out, receipted. Send a dated figure, a company name, a DOI/arXiv id or a package@version and get the verdict, the value and the source it rests on with our retrieval time — the same engine and the same sources the full-price doors read. Unknown is a valid answer and nothing is invented. Paid per call in USDC on Base; no pack code and no free tier.","status":"live","indexable":true,"listed_since":"2026-10-25T17:53:20.381681Z","sources":[{"source":"x402_bazaar","external_id":"https://agents.factstamp.dev/probe","owner_address":"0xc3bcd24a2b350cc73b8516b2a0539a323b42cc32","seen_at":"2026-10-27T21:43:08.495839Z","removed_at":null}],"endpoints":[{"url":"https://agents.factstamp.dev/probe","host":"agents.factstamp.dev","protocol":"x402","state":"live","last_probe_at":"2026-10-28T03:20:01.319488Z","last_ok_at":"2026-10-28T03:20:01.319488Z","tools_count":null,"tools_changed_at":null,"uptime_24h":1.0,"uptime_30d":1.0}],"also_listed_as":[{"slug":"agents-factstamp-dev-e811d8a9","name":"agents.factstamp.dev"}],"payment_options":[{"endpoint_url":"https://agents.factstamp.dev/probe","network":"eip155:8453","scheme":"exact","rail":"exact","asset":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","coin":"USDC","asset_label":"USD Coin","amount":"20000","pay_to":"0xc3bcd24a2b350cc73b8516b2a0539a323b42cc32","observed_at":"2026-10-28T03:20:01.319488Z"}],"usage":{"source":"x402_bazaar","unique_payers_30d":1,"paid_calls_30d":1,"last_paid_at":"2026-10-21T19:25:08.458Z","reported_at":"2026-10-27T21:43:08.495839Z"},"assessment":{"method":"2026.10.2","checks":[{"id":"answers","state":"pass","reason":"Answered a check 23 hours ago."},{"id":"owner","state":"fail","reason":"No one has proven control of its domain or of the wallet it is paid at."},{"id":"track_record","state":"fail","reason":"Listed for 2 days; 30 are needed."},{"id":"real_customers","state":"fail","reason":"1 different wallets paid it in 30 days, as the x402 Bazaar reports (not yet counted by addrbook); 10 are needed."},{"id":"clean_scan","state":"not_applicable","reason":"Not an MCP server."}],"passed":1,"applicable":4,"contradicted":false,"computed_at":"2026-10-28T00:47:16.270937Z"},"identity":{"endpoint_domains":["factstamp.dev"],"proven_domains":[],"proven_wallets":[],"namesakes":[],"namesake_count":0,"identity_checks":[],"wallet_attestations":[],"human_backings":[]},"replies":[],"customers":null,"scan":null,"notice":"Not affiliated with addrbook — claim or request removal."}