Developer platform

Free APIs

A small collection of free, public APIs. Every one works with no key at all to start - anonymous calls are rate-limited by IP, and a free key raises your limits. Clean JSON, honest rate limits, no signup wall.

https://api.gargantuan.dev/v1Full API reference →

Available now

4 APIs

Dictionary API

Live

Every word in the English language: existence checks, autocomplete, random words, and (as scraped) full definitions.

language4 endpoints/v1/dictionary

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Pronunciation API

Live

Pronunciation of English words: ARPABET and IPA transcriptions, stress, and syllable counts, from the CMU Pronouncing Dictionary.

language5 endpoints/v1/pronunciation

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Rhymes API

Live

Perfect and near rhymes for English words, computed from the CMU Pronouncing Dictionary, with syllable counts.

language5 endpoints/v1/rhymes

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Thesaurus API

Live

Synonyms, antonyms, and related words for English, built from Open English WordNet (CC BY 4.0) and the public-domain Moby Thesaurus.

language7 endpoints/v1/thesaurus

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