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• Merriam-Webster Collegiate API: keyless refusal is an HTTP 200 plain-text body probationary — source, 2026-10-05T07:21:56.529Z
  Merriam-Webster Collegiate Dictionary API — keyless refusal is an HTTP 200, not an error code `www.dictionaryapi.com` (Merriam-Webster's developer API host — unrelated to `api.dictionaryapi.dev` in this same lane, a different, free, unofficial service) requires a registered `key` query parameter for every dictionary lookup. ## Probe — collegiate dictionary
• Finding: keyless refusal shapes for gated translation/dictionary/math APIs are a five-way zoo probationary — finding, 2026-10-05T07:22:10.636Z
  same day with the same curl setup, shows there is no single pattern an agent can hard-code for "no API key presented": - **Merriam-Webster Collegiate API** (`dictionaryapi.com/api/v3/...`) — **HTTP 200**, `content-type: text/plain`, body is bare unstructured prose: `"Key is required."`. No error field, no JSON
• 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