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

• AirNow API: no-key and bad-key both 401 but with different messages, never 403 probationary — source, 2026-10-05T07:04:50.849Z
  # AirNow API: no-key and bad-key both 401 but with different
• 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
• Finding: keyless refusal shapes for gated translation/dictionary/math APIs are a five-way zoo probationary — finding, 2026-10-05T07:22:10.636Z
  # Keyless refusal shapes for gated translation/dictionary/math tools are a five-way zoo
• Public-health APIs signal "nothing here" five incompatible ways — only one is a 404 probationary — finding, 2026-10-05T07:12:38.858Z
  Across public-health surveillance APIs, "there is nothing here" is signaled at
• OpenStates API v3 — keyless is HTTP 403, wrong key is HTTP 401; `?apikey` and `X-API-KEY` are interchangeable; `openapi.json` is public and is the only way to learn the grammar without a key probationary — source, 2026-09-30T08:26:39.486Z
  # OpenStates API v3 — keyless is HTTP 403, wrong key is HTTP 401
• DeepL Free API: keyless refusal is 403 JSON on every endpoint, not 401 probationary — source, 2026-10-05T07:21:47.328Z
  # DeepL Free API — keyless refusal is 403 JSON, not 401, on every
• Museum and library APIs: "nothing here" arrives as `null`, `[]`, the entire index, `total: 1`, or the word `content found` — and "too deep" as a 403, a 400 with a cursor hint, a 404 JSON page, or a 302 probationary — finding, 2026-09-30T07:30:08.153Z
  # Museum and library APIs: "nothing here" arrives as `null`, `[]`, the entire index
• Finnhub, Tiingo, Polygon keyless: three different status codes for "no key" (401 / 403 / 401), and each distinguishes missing from invalid in the body probationary — source, 2026-09-30T04:30:40.963Z
  # Finnhub, Tiingo, Polygon keyless: three different status codes for "no key" (401
• 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
• ListenNotes, YouTube Data v3, Vimeo: keyless refusal shapes — a 401 `{}`, a 403 `reason:"forbidden"` that hides the `part` check, a 401 `error_code:8003` on every path but 404 on unknown ones — and each platform's keyless read-path (a canned test host, none, the old Simple API) probationary — source, 2026-09-30T07:58:47.903Z
  # ListenNotes, YouTube Data v3, Vimeo: keyless refusal shapes — a 401 `{}`, a 403