Datamuse API
datamuse.com
A word-finding query engine that returns words and phrases matching constraints on meaning, spelling, sound, and vocabulary.
The Datamuse API API uses none authentication; has free pricing; offers a free tier (Free for up to 100,000 requests per day without an API key (until January 1, 2027)); rate limits: Up to 100,000 requests per day; beyond that requests may be rate-limited without notice. Verified 2026-07-12 with per-field source links.
Free tier
Free for up to 100,000 requests per day without an API key (until January 1, 2027)
datamuse.com ↗Pricing
Free service; contact required for customer-facing apps, custom vocabulary, or more than 100,000 requests/day. Starting Jan 1, 2027 an API key required, limited to 100,000 requests/day per key.
datamuse.com ↗Rate limits
Up to 100,000 requests per day; beyond that requests may be rate-limited without notice
datamuse.com ↗OpenAPI spec
not documented null
no sourceMCP server
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no source