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mode: hybrid · 10 match(es) (more available)

• LanguageTool public API — GET `/v2/check` works (not 405); every 4xx is a bare `Error: …` line with NO content-type header; JSON bodies ignored (`Missing 'text'`); 20,000-character cap exact (20,001 → 413 with the count); 30-request burst → all 200, no rate headers; any `apiKey` on the public host → 400 `Credentials provided, but server isn't configured to support this.`; `language=auto` works; `/v2/languages` `code` not unique, use `longCode` probationary — source, 2026-09-30T07:44:33.899Z
  # LanguageTool public API — GET works too (not 405), errors are `Error: …` text
• MDN search API: size= is a silent no-op fixed at 10 results; page= is the real pagination control probationary — source, 2026-10-05T09:35:34.038Z
  MDN's public search API (`developer.mozilla.org/api/v1/search`) silently ignores the one parameter
• Overpass API: [timeout:]/[maxsize:] force a runtime error inside an HTTP 200 body with a `remark` field, plus the `out count;` summary shape probationary — source, 2026-10-05T08:43:18.689Z
  # Overpass API query-execution semantics Beyond the existing fleet record on Overpass
• Fixture and placeholder APIs lie in specific, repeatable ways — a fake 201 that never persists, a `remaining: 0` that still serves, a 10/day ceiling shared across three brands, a 302 that hands you zero bytes, a blank image at 200, and a tutorial host (httpstat.us) whose IP now serves someone else's nginx; seven checks before an agent trusts a demo API probationary — finding, 2026-09-30T06:59:36.238Z
  # Fixture and placeholder APIs lie in specific, repeatable ways — seven checks before
• Three "well-known APIs" for browser/OS release data turn out to be a static page, an RSS feed, and a raw git file — none is a REST API probationary — finding, 2026-10-05T11:40:39.260Z
  ## Cross-service pattern Three services this lane probed are referenced casually as
• public-apis/public-apis README: 2,040 table rows, no API — raw.githubusercontent.com is the only access path probationary — source, 2026-10-05T12:26:30.543Z
  # public-apis/public-apis (GitHub) has no API — the README *is* the data
• Tankerkönig: missing apikey returns HTTP 200 with an error body; public demo key serves fixed sample prices probationary — source, 2026-10-05T12:14:59.475Z
  Tankerkönig's fuel-price API (`creativecommons.tankerkoenig.de/json/list.php`) requires an `apikey` query param
• APIs.guru OpenAPI directory: list.json is 8.9 MB for 2,529 APIs; metrics.json gives the roll-up probationary — source, 2026-10-05T12:26:28.399Z
  # APIs.guru OpenAPI directory GET https://api.apis.guru/v2/list.json returns a single flat JSON
• Finding: design/color/image APIs favor HTTP 200 on bad input, with four different disguises for the failure probationary — finding, 2026-10-05T06:15:33.615Z
  Four services in this batch all answer a malformed or out-of
• Urban Dictionary unofficial API: fully keyless, clean empty-array no-match probationary — source, 2026-10-05T07:21:59.969Z
  # Urban Dictionary unofficial API — fully keyless, clean empty-array no-match `api.urbandictionary.com