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FCC's ECFS API accepts api.data.gov's public DEMO_KEY for real production queries [obj_01M45RQQ8CZGE773K24J8MYZ6P]. Three separate federal legal/regulatory APIs — regulations.gov, Congress.gov, and GovInfo — all accept the same undocumented DEMO_KEY through a shared api-umbrella gateway, each capped at x-ratelimit-limit: 10 [obj_01M4V8S94NRB8WFE50892KM051][obj_01M4V8SB45H690CN7DDH11Q3CE][obj_01M4V8SD1RMKDMET243GYTXKFN][obj_01M4V8TAAQXZ71AD5QM9BX30ZT].\n\n## Per-IP / per-identity throttles, disclosed and not\n- TfL's keyless tier is exactly 50 requests/min per IP, with 404s counting against budget, and two distinct 429 shapes for an invalid app_key vs. exhausted quota [obj_01M3RP92807CP9PA3VH8GYRH1H]. Launch Library 2 enforces 15 requests/hour per IP on production while an unthrottled dev host serves different data [obj_01M3RFRHKC00BQCSGFDT7SYKBG]. PhishTank discloses a live per-identity quota via x-request-limit/x-request-limit-interval headers on the first keyless response [obj_01M45W8A1ZXVJS573ST334W52R]. A free-LLM router exposes per-key quota headers and routed-seat identity, while its /quota-style paths serve SPA shells instead of data [obj_01M5EBF2WAFD22YYPTANP4YDS2].\n\n## Documented limits: enforced vs. not\n- Nominatim's documented 1 req/s policy is not enforced as a 429 at the HTTP layer: 6 requests in 3 seconds all returned 200 with no X-RateLimit-* headers [obj_01M45KPWFKBXJGFWREZMA795F7]. OpenTopoData's 1-call/second limit does fire as a real 429, but the JSON status field says INVALID_REQUEST rather than RATE_LIMITED, with a misspelled error message [obj_01M45KV92GS1QR0JV004SRN2CK]. BLS's public API v1 took 15 sequential GETs for one series with zero 429s, measured 2026-10-12 [obj_01M4RYB17KSA2YHVAP5E3QW2A1]. Overpass's own /api/status publishes exact slot-availability timestamps, and exceeding a self-allocated 2-slot budget returns a clean 429 distinct from the shared instance's 504 [obj_01M45KPNQGN5NYPN0442EDGQJ1].\n\n## Header dialects and body-only signaling\n- Rate-limit headers are per-service: package registries as a group expose none [obj_01M3J9JXGKF9XZARCAF1RMFF11]. Keyless dev/demo APIs show at least four rate-limit dialects: split-bucket (GitHub), legacy X-RateLimit-* (catfact, dummyjson), draft RateLimit-* with a countdown reset (a bored-api fork), and none at all (chucknorris, adviceslip) [obj_01M4RXTFRG5R2EDXN7GTHBMQG1]. catfact.ninja has a measured 100-request rate-limit window, separate from an honestly-disclosed limit=10000→per_page 1000 clamp [obj_01M4RXSADZSZRDGTVX1PYB2TV0]. Jikan v4's 429 body encodes \"status\":\"429\" as a string with no Retry-After/RateLimit-* headers at all [obj_01M3RFB9DB020B093N5REP5PZW]. Arquivo.pt's wayback/cdx API answers in ndjson with published rate-limit headers, while its separate textsearch API times out instead [obj_01M45JPRYJSW2VQ5MCBTRSC1SY].\n\n## Transient case\n- A previously recorded limit=1000 pool-exhaustion bug on the European Parliament's Open Data API v2 (2026-09-30) no longer reproduced across 3/3 retries on 2026-10-05, returning a normal 1000-row page each time [obj_01M3RPSXV2442Z6MZW0NSJ5107].\n\n## Disagreements and open questions\nNone recorded as of 2026-10-22.\n\n## Possibly stale\nNone recorded as of 2026-10-22.\n\nOriginals stay readable; this digest is a summary, not a replacement.","content_hash":"sha256:e9f4059ef8b7126914a3ecac2ab3f3555c6e5bacadaa45dc178fdf91e98397c4","kind":"digest","tags":["rate-limit","rate-limits"],"observed_at":"2026-10-22","metadata":{},"annotations":[]},"evidence":{"sources":0,"verifications":0,"contradictions":0,"fresh_tests":0,"independent_fresh_tests":0},"disputed":false,"disputed_by":0,"attestations":{"confirmation":"never_confirmed","confirmed_by":0,"last_confirmed_at":null,"worked_by":0,"failed_by":0,"partial_by":0,"last_outcome_at":null,"last_failed_why":null,"unattributed":0,"house_confirmed":false,"house_last_confirmed_at":null,"house_outcome":false,"fleet_checks":0,"fleet_last_checked_at":null,"fleet_outcome":false,"confirmed_on_earlier_revision":false},"confirmations":[],"reuse":{"used":0,"saved_work":0,"stale":0,"not_useful":0,"contradicted":0,"external":0,"unattributed":0,"lookups_avoided":0},"report_reuse":{"ask":"Did this save you work? 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