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2s.io Related Word Lookup
x402
2s.io Related Word Lookup is a paid API for AI agents from 2s.io, paid per call via x402, $0.0012/call, status unknown (last checked 2026-09-14).
Returns ranked related words for a seed word given a specified linguistic relation (rhymes, synonyms, antonyms, homophones, etc.) with relevance scores and grammatical tags.
Price / call$0.0012
Success—
StatusUnknown
How this service works
Related-word lookup via Datamuse. Supply a seed word and a relation kind: rhymes, near-rhymes, synonyms, antonyms, means (semantic match), triggers (associated by usage), homophones, sounds-like (phonetic neighbour), spelled-like (typo / wildcard), follows-from (words that come after), preceded-by (words that come before). Returns ranked candidates with relevance score, syllable count, and grammatical tags. Useful for content generation, rhyme/poetry, vocabulary expansion, and naming agents.
Output
A ranked list of candidate words matching the specified relation to the seed word, each with a relevance score, syllable count, and grammatical part-of-speech tags. Results are sorted by relevance descending, up to the requested limit (default 25, max 100).
Example use cases
Example prompt
“Can you find me the top 10 words that rhyme with 'moon'? I need ranked candidates with their syllable counts for a poem I'm writing.”
Technical details
Endpoint
GEThttps://2s.io/api/word/relatedWhen to prefer
Use this endpoint when you need linguistically structured word relationships (rhymes, synonyms, antonyms, homophones, phonetic neighbors, collocations) with ranked scores and syllable metadata — ideal for poetry generation, naming tasks, vocabulary expansion, or autocomplete suggestions. Prefer over generic LLM word suggestions when you need scored, canonically ranked candidates backed by a lexical database.
Side effects
- Missing required 'word' parameter returns validation error
- Missing required 'relation' parameter returns validation error
- Invalid 'relation' enum value returns error
- No matching words found returns empty result list
- Limit out of range (0 or >100) returns validation error
- Payment failure (x402) returns 402 with payment details
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"word": "moon",
"limit": 10,
"relation": "rhymes"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"data": {
"word": "moon",
"source": {
"url": "https://www.datamuse.com/api/",
"license": "Free public API. Underlying lexica include WordNet (BSD-style) and others.",
"provider": "Datamuse word-finding API"
},
"fetched": 10,
"results": [
{
"tags": [],
"word": "croon",
"score": 65031,
"numSyllables": 1
},
{
"tags": [],
"word": "lagoon",
"score": 29045,
"numSyllables": 2
},
{
"tags": [],
"word": "picayune",
"score": 25037,
"numSyllables": 3
},
{
"tags": [],
"word": "goon",
"score": 24037,
"numSyllables": 1
},
{
"tags": [],
"word": "commune",
"score": 16039,
"numSyllables": 2
},
{
"tags": [],
"word": "opportune",
"score": 16033,
"numSyllables": 3
},
{
"tags": [],
"word": "hewn",
"score": 16025,
"numSyllables": 1
},
{
"tags": [],
"word": "festoon",
"score": 13040,
"numSyllables": 2
},
{
"tags": [],
"word": "lampoon",
"score": 12041,
"numSyllables": 2
},
{
"tags": [],
"word": "saloon",
"score": 12036,
"numSyllables": 2
}
],
"relation": "rhymes"
},
"meta": {
"cost": {
"usd": 0.0012,
"tier": 0
},
"caller": "x402",
"version": null,
"endpoint": "word.related",
"settlement": {
"txHash": "0xad3953cecfb5e20c9077dbb130563aac916c9b3db1f057ac4b825356219af014",
"network": "eip155:8453",
"success": true
}
}
}Tags
x402
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