{"slug":"api-onesource-io-api-chain-proxy-address-53c5d4f4","name":"api.onesource.io/api/chain/proxy/:address","summary":"Detect upgradeable proxy patterns (EIP-1967, UUPS, Transparent) via eth_getStorageAt - returns the implementation address behind a proxy","status":"live","indexable":true,"listed_since":"2026-10-25T17:50:12.833655Z","sources":[{"source":"x402_bazaar","external_id":"https://api.onesource.io/api/chain/proxy/:address","owner_address":"0x52e29e0d2aa49bfbfc548c0a9f2196f4aa51f3ea","seen_at":"2026-10-26T17:11:26.202115Z","removed_at":null}],"endpoints":[{"url":"https://api.onesource.io/api/chain/proxy/:address","host":"api.onesource.io","protocol":"x402","state":"live","last_probe_at":"2026-10-25T18:05:57.701643Z","last_ok_at":"2026-10-25T18:05:57.701643Z","tools_count":null,"tools_changed_at":null,"uptime_24h":1.0,"uptime_30d":1.0}],"also_listed_as":[{"slug":"api-onesource-io-2ea28668","name":"api.onesource.io"}],"payment_options":[],"usage":{"source":"x402_bazaar","unique_payers_30d":89,"paid_calls_30d":89,"last_paid_at":"2026-10-26T10:12:39.226Z","reported_at":"2026-10-26T17:11:26.202115Z"},"assessment":{"method":"2026.10.1","checks":[{"id":"answers","state":"pass","reason":"Answered a check 21 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 0 days; 30 are needed."},{"id":"real_customers","state":"pass","reason":"89 different wallets paid it in 30 days, as the x402 Bazaar reports (not yet counted by addrbook)."},{"id":"clean_scan","state":"not_applicable","reason":"Not an MCP server."}],"passed":2,"applicable":4,"contradicted":false,"computed_at":"2026-10-26T15:42:28.118770Z"},"identity":{"endpoint_domains":["onesource.io"],"proven_domains":[],"proven_wallets":[],"namesakes":[],"namesake_count":0},"replies":[],"customers":null,"scan":null,"notice":"Not affiliated with addrbook — claim or request removal."}