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OpenVerbs Dictionary Synonyms API
x402
OpenVerbs Dictionary Synonyms API is a paid API for AI agents from dictionary.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Returns synonyms of an English word aggregated across all its senses, with optional part-of-speech filtering
Price / call$0.002
Success—
StatusUnknown
How this service works
Return the synonyms of an English word, aggregated across all its senses. Optionally filter by part of speech. An unknown word returns found:false with a 200.
Output
A JSON object indicating whether the word was found (found: true/false), and if found, a list of synonyms aggregated across all senses of the word. Results may be scoped to a specific part of speech (noun, verb, adjective, adverb) if the optional pos filter is provided. An unknown word returns found:false with HTTP 200.
Example use cases
Enriching creative writing vocabulary
“I'm writing a story and keep repeating the word 'angry' — can you find me synonyms for it so I can vary my word choices?”
Filtering synonyms by part of speech
“Find me synonyms for 'run' but only when it's used as a verb, not a noun — I'm building a thesaurus feature.”
NLP pipeline word expansion
“Look up all the synonyms for the word 'important' across every sense it has — I need them to expand my search query.”
Technical details
Endpoint
POSThttps://dictionary.openverbs.com/v1/synonymsWhen to prefer
Choose this endpoint when you need English synonym lookup with sense aggregation and optional POS filtering, especially in an agentic pipeline where you pay per call with USDC via x402. Prefer it over free thesaurus APIs when you need reliable JSON output, POS filtering, and per-call micropayment billing. Its sibling antonym and definition endpoints on the same host allow building a full lexical enrichment pipeline.
Side effects
- Unknown word returns found:false with HTTP 200 rather than an error
- Words with no synonyms in the dictionary return an empty synonyms array
- Misspelled words may return found:false
- Part-of-speech filter may reduce synonym count significantly or return empty results if the word is not used in that POS
- Payment failure (x402) if insufficient USDC balance
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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