{"uid":"cap_-lVw0FhjCDYM3FbP1Qwwg","slug":"synapse-dictionary-thesaurus-api-3308f224","name":"Synapse Dictionary & Thesaurus API","description":"Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.","url":"https://anibalb.duckdns.org/x402/dictionary-thesaurus?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"op":"ml","query":"blockchain","results":[{"word":"disdain","score":105035}]}},"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_W2OJ_T997DjpEgXNp04GI","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 synonyms, related words, and thesaurus results for a given query word or phrase via a pay-per-call API using USDC on Base.","exampleAgentPrompt":"Can you look up words that mean something similar to 'blockchain' and give me a ranked list of related terms?","exampleUseCases":[{"title":"Vocabulary expansion for content writing","prompt":"I'm writing an article and I keep repeating the word 'innovative' — can you find me a list of synonyms and closely related words I could use instead?"},{"title":"Thesaurus lookup for academic writing","prompt":"What words have a similar meaning to 'decentralized' that I could use in a research paper? Give me the top results with their relevance scores."},{"title":"Word suggestion for crossword or puzzle","prompt":"I need words that are semantically related to 'ledger' — can you pull a ranked list of similar or associated words for me?"}],"resultDescription":"Returns a JSON array of word objects, each containing a 'word' field (the related term) and a 'score' field (numeric relevance/similarity score). Results are ranked by score descending. The response also echoes the operation type ('op') and original query.","failureModes":["Missing required 'word' or query parameter returns an error or empty results","Invalid operation type may return unexpected results","Network or DNS issues with duckdns.org dynamic host could cause timeouts","Payment failure (insufficient USDC balance) results in HTTP 402 response","Very obscure or misspelled words may return empty results array"],"whenToPreferThis":"Choose this endpoint when you need fast, pay-per-call thesaurus or synonym lookups without account registration or API keys. It is ideal for agents that need occasional vocabulary enrichment, synonym expansion, or word similarity scoring without committing to a subscription. Prefer this over traditional thesaurus APIs when operating in a crypto-native, x402-payment environment on Base.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:42:07.914Z","isFirstParty":false,"canonicalSlug":"synapse-dictionary-thesaurus-api-3308f224"}