{"id":"1d88c3c8-44f","name":"currency-api-production-4a8d.up.railway.app/rates/historical","description":"Historical fiat exchange rates for a given date (YYYY-MM-DD, back to 1999-01-04) and base currency; optionally restrict to specific targets.","endpoint_url":"https://currency-api-production-4a8d.up.railway.app/rates/historical","endpoint_canonical":"https://currency-api-production-4a8d.up.railway.app/rates/historical","category":"data.fx","kind":"api","price_amount":0.001,"price_currency":"USDC","chains":["base"],"request_schema":null,"response_schema":null,"sample_query":null,"facilitator_url":null,"status":"verified","delisted_reason":null,"origin":"indexed","ephemeral":false,"created_at":1793354091,"updated_at":1793355529,"status_changed_at":1793355529,"embedding_synced_at":1793357679,"score":1,"p50_latency_ms":167,"p95_latency_ms":555,"p99_latency_ms":1642,"probe_count":346,"probes_passed":346,"last_ok_at":1794018649,"consecutive_failures":0,"last_probed_at":1794018649,"probe_interval_s":7200,"distinct_payers":0,"x402_version":2,"transport":"header","obs_scheme":"exact","accepts_count":1,"accepts_index":0,"obs_network":"eip155:8453","obs_asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","obs_pay_to":"0xFFc458dB291b4ABcE020fE3de4f91F2770E537b1","amount_atomic":"1000","amount_usd":0.001,"domain_name":"USD Coin","domain_version":"2","observed_at":1794018649,"obs_first_seen_at":1793354209,"price_changed_at":null,"pay_to_changed_at":null,"payto_unstable":false,"payto_distinct_recent":1,"onchain_provider_status":null,"onchain_payto_checked":"0xffc458db291b4abce020fe3de4f91f2770e537b1","onchain_checked_at":1794018995,"onchain_last_attempt_at":1794018995,"onchain_provider_error":0,"onchain_source":"index","header_bytes":3262,"verified_via":"GET","testnet":false,"payment_protocols":["x402"],"mpp_methods":null,"mpp_offers":null,"mpp_note":null,"onchain_payto_shared_listings":31,"onchain_count_capped":false,"onchain_shape":{"sample_n":25,"eip3009":25,"plain":0,"other":0,"sampled_at":1788164634},"onchain_daily":[{"day":"2026-10-08","tx":69,"payers":5,"usd":0.136},{"day":"2026-10-09","tx":15,"payers":2,"usd":0.016},{"day":"2026-10-10","tx":16,"payers":4,"usd":12.411168},{"day":"2026-10-11","tx":20,"payers":4,"usd":0.023},{"day":"2026-10-12","tx":14,"payers":2,"usd":0.014},{"day":"2026-10-13","tx":8,"payers":5,"usd":0.03},{"day":"2026-10-14","tx":14,"payers":2,"usd":0.014},{"day":"2026-10-15","tx":12,"payers":1,"usd":0.012},{"day":"2026-10-16","tx":13,"payers":2,"usd":0.013},{"day":"2026-10-17","tx":3,"payers":2,"usd":0.003},{"day":"2026-10-19","tx":1,"payers":1,"usd":0.002},{"day":"2026-10-21","tx":6,"payers":1,"usd":0.01},{"day":"2026-10-22","tx":6,"payers":2,"usd":0.008},{"day":"2026-10-23","tx":10,"payers":3,"usd":0.015},{"day":"2026-10-24","tx":4,"payers":2,"usd":0.008},{"day":"2026-10-25","tx":114,"payers":7,"usd":0.214},{"day":"2026-10-26","tx":4,"payers":3,"usd":29.760283},{"day":"2026-10-28","tx":5,"payers":3,"usd":0.008},{"day":"2026-10-29","tx":26,"payers":5,"usd":0.038},{"day":"2026-10-30","tx":22,"payers":5,"usd":0.022},{"day":"2026-10-31","tx":33,"payers":4,"usd":0.044},{"day":"2026-11-01","tx":38,"payers":5,"usd":0.042},{"day":"2026-11-02","tx":33,"payers":4,"usd":0.046},{"day":"2026-11-03","tx":37,"payers":1,"usd":0.037},{"day":"2026-11-04","tx":21,"payers":2,"usd":0.022},{"day":"2026-11-06","tx":10,"payers":1,"usd":0.01}],"latest_purchase_delivered":false,"latest_purchase_at":1793516509,"paid_verification_latest":{"at":1793516509,"delivered":false,"tx_hash":"0xd7f8352f77f28026280269fafed3bf5d101e14d87fd6bfd5be78cfb7f43abf6a","amount_usdc":0.001,"failure_reason":"stale_data","note":"Most recent settled purchase by the nohumans scout; it did NOT deliver. 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