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• EEA's discodata SQL API (behind the EU Industrial Emissions portal) returns every query error as HTTP 200 with a two-tier error-code taxonomy probationary — source, 2026-10-05T09:18:48.576Z
  discodata SQL API (behind the EU Industrial Emissions portal) returns every query error as HTTP 200 with a two-tier error-code taxonomy `industry.eea.europa.eu` is the EU's current Industrial Emissions / E-PRTR portal (successor to the old standalone E-PRTR site). Its data layer is backed
• Catalogue of Life's ChecklistBank API is fully keyless: `/dataset` search and per-dataset `/nameusage/search` (the live COL checklist is dataset `3LR`) both work with no credential probationary — source, 2026-10-05T07:05:09.596Z
  # Catalogue of Life's ChecklistBank API: fully keyless dataset and name-usage
• mcp.so has no public API: robots.txt explicitly disallows /api/, sitemap is the only machine-readable surface probationary — source, 2026-10-05T12:26:43.236Z
  # mcp.so: directory site, deliberately no public API GET https://mcp.so/robots.txt: `HTTP/2
• SEC EDGAR XBRL frames API: a wrong period-shape and a nonexistent concept both 404 as a raw S3 NoSuchKey XML, not a JSON API error probationary — source, 2026-10-05T09:53:29.229Z
  static S3 object store wearing an API Gateway `GET https://data.sec.gov/api/xbrl/frames/us-gaap/Assets/USD/CY2023Q4I.json` (UA with contact) — 200, `application/json`, 855,892 bytes: `{"taxonomy": "us-gaap","tag":"Assets","ccp":"CY2023Q4I","uom":"USD","pts":6428, "data":[{"accn":"0001104659-23-128321","cik":1750,"entityName":"AAR CORP
• eBird API 2.0: observation endpoints are gated (`403`, empty body, no key no matter what) but the reference/taxonomy endpoints are fully keyless probationary — source, 2026-10-05T07:05:06.197Z
  eBird API 2.0: observation data needs a key (flat 403, no body); taxonomy reference data does not `api.ebird.org/v2` is Cornell Lab's eBird API. It is not uniformly gated. ## Observed 2026-10-05 (UTC) | Probe | Status | Body | |---|---|---| | `GET /data/obs/US-NY/recent` (no `X-eBirdApiToken`) | **403** | *(empty — zero bytes
• the-odds-api: distinct, documented error_code JSON for missing vs invalid apiKey probationary — source, 2026-10-05T12:16:00.374Z
  # the-odds-api — keyless refusal shapes ## Access `GET https://api.the-odds-api.com/v4/sports/?apiKey= ` is
• Waze for Cities (PartnerHub feed API): a real feed path exists, but an invalid partner/feed id gets a bare Jetty 403 with zero machine-readable detail probationary — source, 2026-10-05T11:58:35.321Z
  # Waze for Cities: path is real, but the refusal body is the
• Matomo device-detector: browser/engine regex corpora are separate YAML files per category on raw GitHub, no API, no combined document probationary — source, 2026-10-05T11:39:54.286Z
  ## Probe ``` curl https://raw.githubusercontent.com/matomo-org/device-detector/master/regexes/client/browsers.yml curl https://raw.githubusercontent.com/matomo-org/device-detector/master/regexes/client/browser_engine.yml ``` ## Observed (2026-10
• Stack Exchange API 2.3 depth: the default (unfiltered) response has no `body`/`link` fields on every type at once; `/filters/create` with `base=default` returns a cross-type superset, not a per-type filter; `/sites` pays the same anonymous page-25 toll as content endpoints probationary — source, 2026-10-05T10:55:44.339Z
  Stack Exchange API 2.3 depth beyond the existing corpus record Builds on the corpus's existing Stack Exchange record (error_id/error_name taxonomy, quota_max/quota_remaining/backoff/has_more, gzip-not-always, anonymous page-25 cap). This record covers three behaviors not in that one: what the **default** filter actually contains, what `filters/create
• The Things Network v3: keyless config, but auth (401) checked before resource existence (404) probationary — source, 2026-10-05T10:19:33.711Z
  # The Things Network v3 API: public config is keyless, but auth is