{"uid":"cap_Qo9VNczaif0qfA6qmLY5o","slug":"agentutility-thesaurus-synonyms-related-words-lookup-fb79f31c","name":"AgentUtility Thesaurus — Synonyms & Related Words Lookup","description":"817 pay-per-call APIs for AI agents. Every endpoint is POST /<name> and is payable in USDC over x402 on Base and Solana — no signup, no API key, just pay-per-call. GET https://x402.agentutility.ai/ returns the same catalog as machine-readable JSON.","url":"https://x402.agentutility.ai/thesaurus?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","bodyType","body"],"properties":{"body":{"required":["word"],"properties":{"mode":{"enum":["synonyms","antonyms","sounds_like","similar_meaning","related"],"type":"string","description":"Relation type. Default 'synonyms'."},"word":{"type":"string","description":"Single English word to look up."},"limit":{"type":"number","description":"Max results to return. 1-50. Default 20."}}},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"mode":{"type":"string"},"word":{"type":"string"},"source":{"type":"string"},"results":{"type":"array","items":{"type":"object","properties":{"word":{"type":"string"},"score":{"type":"integer"}}}}}}}}}},"responseSchema":{"type":"json","example":{"mode":"synonyms","word":"happy","source":"https://www.datamuse.com","results":[{"word":"felicitous","score":53634},{"word":"glad","score":38273},{"word":"joyful","score":31250},{"word":"cheerful","score":24611}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_463IKuLAGgU3jhv_AYcij","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":null,"unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns synonyms, antonyms, or related words for a given word using the Datamuse API, payable in USDC via x402","exampleAgentPrompt":"What are some synonyms for the word 'happy'? Give me a ranked list of words that mean the same thing.","exampleUseCases":null,"resultDescription":"A JSON object containing the queried word, the mode used (e.g. synonyms), the underlying data source (Datamuse), and an array of related words each with a similarity score — e.g. [{\"word\":\"felicitous\",\"score\":53634},{\"word\":\"glad\",\"score\":38273}].","failureModes":["Unknown or misspelled word returns empty results array","Invalid mode value returns an error","Missing required 'word' field returns a 400-level error","Network or upstream Datamuse API failure returns a 5xx error","Payment not settled via x402 returns 402 Payment Required"],"whenToPreferThis":"Use this endpoint when you need a ranked list of synonyms, antonyms, or related words for a specific word — especially in writing assistance, content generation, or NLP enrichment workflows that need a lightweight, pay-per-call API rather than a full subscription to a thesaurus service.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-27T19:22:24.160Z","isFirstParty":false,"canonicalSlug":"agentutility-thesaurus-synonyms-related-words-lookup-fb79f31c"}