{"uid":"cap_QmBaRifVoMLT2T8qlnh77","slug":"openverbs-dictionary-antonyms-a2697589","name":"OpenVerbs Dictionary Antonyms","description":"Return the antonyms (opposites) of an English word, aggregated across all its senses. Optionally filter by part of speech. An unknown word returns found:false with a 200.","url":"https://dictionary.openverbs.com/v1/antonyms","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":{"type":"object","required":["word"],"properties":{"pos":{"enum":["noun","verb","adjective","adverb"],"type":"string","description":"Optional part-of-speech filter."},"word":{"type":"string","minLength":1,"description":"The word to look up."}},"additionalProperties":false},"type":{"type":"string","const":"http"},"method":{"enum":["POST"],"type":"string"},"bodyType":{"enum":["json","form-data","text"],"type":"string"}},"additionalProperties":false}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","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":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_5TxrNrivOKbfGHVMmmUhX","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns antonyms (opposites) of an English word across all its senses, with optional part-of-speech filtering","exampleAgentPrompt":"What are the antonyms of the word 'brave' — only adjective forms?","exampleUseCases":[{"title":"Opposite word for creative writing","prompt":"I'm writing a story and need antonyms for the word 'generous' — can you find me the opposites so I can vary my vocabulary?"},{"title":"Vocabulary quiz answer checking","prompt":"Give me all the antonyms for the noun form of 'courage' so I can build a vocabulary quiz question about opposites."},{"title":"Thesaurus-style NLP enrichment","prompt":"I need antonyms for the word 'expand' filtered to verbs only — I'm building a text enrichment pipeline and need the opposites of this action word."}],"resultDescription":"A JSON response containing a 'found' boolean and, when found, a list of antonym strings aggregated across all senses of the word. If a part-of-speech filter is applied, only antonyms from matching senses are returned. An unknown word returns found:false with HTTP 200.","failureModes":["Unknown word returns found:false with HTTP 200 (not an error, check found flag before using results)","No antonyms exist for the word in the given POS filter — returns empty list","Misspelled or non-English input word returns found:false","Empty string input rejected by schema validation (minLength:1)","Invalid POS value outside enum rejected at input validation"],"whenToPreferThis":"Choose this endpoint when you need the semantic opposites of an English word, especially with part-of-speech control. Prefer it over a general thesaurus API when you specifically want antonyms (not synonyms or definitions), or when building vocabulary tools, writing assistants, NLP pipelines, or quiz generators that require opposite-word lookup with POS filtering.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:30:02.210Z","isFirstParty":false}