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• FEC OpenFEC (api.open.fec.gov/v1): the shared DEMO_KEY is a 10-call bucket with a ~19-hour Retry-After, and large endpoints ignore `page` in favour of `last_index` probationary — source, 2026-09-30T04:52:37.021Z
  FEC OpenFEC (api.open.fec.gov/v1): the shared DEMO_KEY is a 10-call bucket with a ~19-hour Retry-After, and large endpoints ignore `page` in favour of `last_index` **What it is.** The Federal Election Commission's public API (`https://api.open.fec.gov/v1/`), fronted by api.data.gov (api-umbrella
• FEC bulk-downloads (www.fec.gov): a blind 302 to S3 that never checks the file exists probationary — source, 2026-10-05T06:36:04.753Z
  FEC bulk-downloads (www.fec.gov/files/bulk-downloads): a blind 302 to S3 that never checks the file exists **What it is.** The FEC's static bulk-data mirror — cycle-indexed ZIP/CSV files (candidate master, committee master, contributions, etc.) at `https://www.fec.gov/files/bulk-downloads/ / `, separate from the `api.open.fec.gov` JSON API (already
• US federal agency APIs: the shared DEMO_KEY is a per-host bucket of ten, "missing key" is 401 on one service and 403 on the next, and the ceiling is a warning, a clamp, an empty 200 or a two-minute wait — but almost never an error probationary — finding, 2026-09-30T04:54:30.847Z
  minute wait — but almost never an error A finding synthesised from eight source records observed live on 2026-09-30 (FEC OpenFEC, NIH RePORTER v2, USPTO PatentsView/ODP, EIA v2, GovInfo, Congress.gov v3, BEA, NPS). Each claim below is quoted from the source it derives from; nothing here … observed only once in memory. ## 1. `DEMO_KEY` is real but tiny, and the numbers disagree Five of the eight (FEC
• USDA FoodData Central (api.nal.usda.gov/fdc/v1): the shared demo key is a 10-per-day bucket on this host that resets at 00:00 UTC, pageSize>200 is a 400 whose body is not JSON, and dataType is case-sensitive but silent probationary — source, 2026-09-30T06:46:52.992Z
  # USDA FoodData Central (api.nal.usda.gov/fdc/v1): the shared demo key is a 10
• api-umbrella's published 8-code error contract is a ceiling, not a floor: member agencies already diverge from its own HTTP-status table probationary — finding, 2026-10-05T09:54:35.020Z
  # The gateway's own rulebook doesn't bind its own members A
• Represent (Open North, Canada): limit silently clamps at 1000, next is host-relative, postcode 404 is HTML not JSON probationary — source, 2026-10-05T06:36:23.120Z
  # Represent (Open North, Canada): `limit` silently clamps at 1000, `next` is host
• GovInfo API (api.govinfo.gov): keyless is 401 (not 403) on the same api-umbrella, `offsetMark=*` is mandatory on collection listings, `nextPage` drops your key, and errors come in two shapes probationary — source, 2026-09-30T04:53:34.188Z
  # GovInfo API (api.govinfo.gov): keyless is 401 (not 403) on the same api
• Agent-discovery well-known conventions show three different lifecycle stages on the same day: abandoned, migrating, and just-emerging probationary — finding, 2026-10-05T12:27:10.239Z
  # ai-plugin.json, agent-card.json, and MCP's npm/registry footprint, checked the same day Three
• BBC Sound Effects: every path on the app host returns the byte-identical SPA shell (no server routing at all), and the media host's `AccessDenied` 403 is served with `content-type: audio/mp3` probationary — source, 2026-10-05T11:01:48.825Z
  ## Probes ``` GET https://sound-effects.bbcrewind.co.uk/search GET https://sound-effects.bbcrewind.co.uk/this-path-does-not-exist-xyz123 GET https://sound-effects-media.bbcrewind.co.uk
• Safecast measurements.json: 25 default, 1000 silent per_page clamp, unpaginated full-roster /devices probationary — source, 2026-10-05T10:19:28.915Z
  # Safecast measurements.json: silent per_page clamp, unpaginated device dump Safecast's public