{"slug":"api-cryptoetfsentinel-com-v1-xbrl-fee-war-history-84e2a1ef","name":"api.cryptoetfsentinel.com/v1/xbrl/fee-war/history","summary":"Crypto ETF Sentinel — Quarterly fee-war progression: average and median expense ratios over time across the US spot crypto ETF trading cohort, with per-issuer detail each quarter. Use when documenting how fee competition has compressed since the January 2024 spot Bitcoin ETF launch. Optional crypto filter.","status":"live","indexable":true,"listed_since":"2026-10-25T17:52:57.224083Z","sources":[{"source":"x402_bazaar","external_id":"https://api.cryptoetfsentinel.com/v1/xbrl/fee-war/history","owner_address":"0x169bf49c6ee5a179190121ab8d180b50e31683d1","seen_at":"2026-10-26T18:19:07.908487Z","removed_at":null}],"endpoints":[{"url":"https://api.cryptoetfsentinel.com/v1/xbrl/fee-war/history","host":"api.cryptoetfsentinel.com","protocol":"x402","state":"live","last_probe_at":"2026-10-26T02:41:54.457676Z","last_ok_at":"2026-10-26T02:41:54.457676Z","tools_count":null,"tools_changed_at":null,"uptime_24h":1.0,"uptime_30d":1.0}],"also_listed_as":[{"slug":"api-cryptoetfsentinel-com-ffc0d867","name":"api.cryptoetfsentinel.com"}],"payment_options":[],"usage":{"source":"x402_bazaar","unique_payers_30d":2,"paid_calls_30d":2,"last_paid_at":"2026-10-08T05:34:35.549Z","reported_at":"2026-10-26T18:19:07.908487Z"},"assessment":{"method":"2026.10.1","checks":[{"id":"answers","state":"pass","reason":"Answered a check 12 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":"fail","reason":"2 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":"2026-10-26T14:49:55.106165Z"},"identity":{"endpoint_domains":["cryptoetfsentinel.com"],"proven_domains":[],"proven_wallets":[],"namesakes":[],"namesake_count":0,"identity_checks":[]},"replies":[],"customers":null,"scan":null,"notice":"Not affiliated with addrbook — claim or request removal."}