{"openapi":"3.1.0","info":{"title":"2s — the (most) everything API","version":"1","summary":"The (most) everything API.","description":"The (most) everything API for AI agents: 575+ pay-per-call endpoints on one origin. More live, ground-truth data than any other x402 service — public records, finance & SEC filings, crypto & web3, security & CVEs, legal, medical, weather, geocoding, and B2B/EDI. A full AI gateway: chat, image, and multi-model consensus across every major model, priced per request in the 402 before you pay. And agent infrastructure with no account: wallet-scoped storage (kv/docs/vectors/files), locks, queues, scheduled callbacks, pub/sub, and watchers that push signed webhooks when the world changes. Pay per call in USDC on Base or Solana via x402 — no API keys, no signup, no subscription. The first x402 API with upto billing: on AI endpoints, authorize the quoted max and settle only your actual usage. Try before you buy: add ?trial=1 (or header X-2s-Trial: 1) to any endpoint for one free real call per endpoint per hour — no wallet needed. New endpoints land constantly.","contact":{"name":"2s","url":"https://2s.io","email":"alley@2s.io"},"x-logo":{"url":"https://2s.io/icon-512.png","altText":"2s"},"x-guidance":"Pay-per-call REST API for AI agents — hundreds of endpoints returning ground-truth data (US public records, company & legal identifiers, finance/SEC, crypto/web3, security & CVEs, medical codes, weather & geocoding, agriculture, energy, maritime, music, and more). Every endpoint is paid per call in USDC via x402 (Base or Solana) — no API key, no signup. Call any endpoint with no auth to get a 402 PaymentRequirements envelope, sign it (EIP-3009 on Base, partial SPL transfer on Solana), and retry with the PAYMENT-SIGNATURE header. Add ?trial=1 for one free real call per endpoint per hour to test before paying. To discover the right endpoint: GET https://2s.io/api/directory for the full catalog, or GET https://2s.io/api/search/endpoints?q=<natural-language task> for a ranked match. Per-call price is on each operation as x-payment-info (from $0.001). Batch up to 50 calls behind one payment via POST https://2s.io/api/batch/run."},"servers":[{"url":"https://2s.io"}],"components":{"responses":{"BadRequest":{"description":"Bad request — invalid parameters."},"PaymentRequired":{"description":"Payment required. Body contains the x402 PaymentRequirements envelope with a multi-network accepts array; the per-call price is in accepts[].amount (and on the operation as x-2s-price). Sign for whichever rail you hold USDC on (EIP-3009 for Base, partial SPL transfer for Solana) and retry with the PAYMENT-SIGNATURE header (X-PAYMENT also accepted for v1 clients).","content":{"application/json":{"schema":{"$ref":"#/components/schemas/X402PaymentRequiredV2"}}}},"MethodNotAllowed":{"description":"Method not allowed — see `Allow` header for the supported method."},"ServerError":{"description":"Internal server error."},"UpstreamError":{"description":"Upstream provider error."}},"parameters":{"TrialMode":{"name":"trial","in":"query","required":false,"description":"Try before you buy. Set to 1 for one free real call per endpoint per hour — no wallet or payment needed — to verify the endpoint before paying. Equivalent to sending the \"X-2s-Trial: 1\" request header. 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See https://x402.org."}},"schemas":{"Source":{"type":"object","description":"Provenance of the data: upstream provider, source URL, and license.","properties":{"provider":{"type":"string","description":"Upstream data provider."},"url":{"type":"string","description":"Source URL or documentation link."},"license":{"type":"string","description":"License / usage terms for the data."}}},"CallMeta":{"type":"object","description":"Per-call meta envelope — endpoint id, cost, caller kind, settlement details."},"X402PaymentRequiredV2":{"type":"object","description":"x402 v2 PaymentRequired envelope. 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Returns full entries with IPA phonetic transcription(s), audio pronunciation URLs, and meanings grouped by part of speech. Each meaning carries definitions with usage examples and per-definition synonyms + antonyms. CC BY-SA 3.0/4.0 — attribute when redistributing. Useful for vocabulary agents, writing assistants, language-learning tools.","operationId":"word_define","deprecated":false,"security":[{"x402Payment":[]}],"responses":{"200":{"description":"Normalized envelope: items = dictionary entries for the word (phonetics, meanings by part of speech, per-definition synonyms/antonyms); total = number of entries.","content":{"application/json":{"schema":{"type":"object","required":["data","meta"],"properties":{"data":{"type":"object","properties":{"ok":{"type":"boolean","enum":[true]},"items":{"type":"array","items":{"type":"object","properties":{"word":{"type":"string"},"phonetic":{"type":"string","nullable":true},"phonetics":{"type":"array","items":{"type":"object","properties":{"text":{"type":"string","nullable":true},"audio":{"type":"string","nullable":true},"sourceUrl":{"type":"string","nullable":true}},"required":["text","audio","sourceUrl"],"additionalProperties":false}},"meanings":{"type":"array","items":{"type":"object","properties":{"partOfSpeech":{"type":"string"},"definitions":{"type":"array","items":{"type":"object","properties":{"definition":{"type":"string"},"example":{"type":"string","nullable":true},"synonyms":{"type":"array","items":{"type":"string"}},"antonyms":{"type":"array","items":{"type":"string"}}},"required":["definition","example","synonyms","antonyms"],"additionalProperties":false}},"synonyms":{"type":"array","items":{"type":"string"}},"antonyms":{"type":"array","items":{"type":"string"}}},"required":["partOfSpeech","definitions","synonyms","antonyms"],"additionalProperties":false}},"sourceUrls":{"type":"array","items":{"type":"string"}},"license":{"type":"object","properties":{"name":{"type":"string"},"url":{"type":"string"}},"required":["name","url"],"additionalProperties":false,"nullable":true}},"required":["word","phonetic","phonetics","meanings","sourceUrls","license"],"additionalProperties":false}},"total":{"type":"integer","nullable":true,"description":"Total matching rows upstream; null when unknown."},"source":{"$ref":"#/components/schemas/Source"}},"required":["ok","items","total","source"],"additionalProperties":false},"meta":{"$ref":"#/components/schemas/CallMeta"}}}}}},"400":{"$ref":"#/components/responses/BadRequest"},"402":{"$ref":"#/components/responses/PaymentRequired"},"405":{"$ref":"#/components/responses/MethodNotAllowed"},"500":{"$ref":"#/components/responses/ServerError"},"502":{"$ref":"#/components/responses/UpstreamError"}},"x-2s-id":"word.define","x-2s-version":null,"x-2s-price":{"usd":0.003},"x-2s-accepts":["x402"],"x-2s-response-shape":"normalized","x-payment-info":{"price":{"mode":"fixed","currency":"USD","amount":"0.003000"},"protocols":[{"x402":{}}]},"parameters":[{"name":"word","in":"query","required":true,"description":"Word.","schema":{"type":"string","pattern":"^[a-zA-Z][a-zA-Z'.-]{0,49}$"}},{"$ref":"#/components/parameters/TrialMode"}]}},"/api/word/related":{"get":{"tags":["word"],"summary":"Related-word lookup via Datamuse.","description":"Related-word lookup via Datamuse. Supply a seed word and a relation kind: rhymes, near-rhymes, synonyms, antonyms, means (semantic match), triggers (associated by usage), homophones, sounds-like (phonetic neighbour), spelled-like (typo / wildcard), follows-from (words that come after), preceded-by (words that come before). Returns ranked candidates with relevance score, syllable count, and grammatical tags. Useful for content generation, rhyme/poetry, vocabulary expansion, and naming agents.","operationId":"word_related","deprecated":false,"security":[{"x402Payment":[]}],"responses":{"200":{"description":"Normalized envelope: items = ranked related words (word, score, syllables, tags); total = null (Datamuse caps candidates without a true count); meta echoes seed word + relation + fetched count.","content":{"application/json":{"schema":{"type":"object","required":["data","meta"],"properties":{"data":{"type":"object","properties":{"ok":{"type":"boolean","enum":[true]},"items":{"type":"array","items":{"type":"object","properties":{"word":{"type":"string"},"score":{"type":"number"},"numSyllables":{"type":"integer","nullable":true},"tags":{"type":"array","items":{"type":"string"}}},"required":["word","score","numSyllables","tags"],"additionalProperties":false}},"total":{"type":"integer","nullable":true,"description":"Total matching rows upstream; null when unknown."},"source":{"$ref":"#/components/schemas/Source"},"meta":{"type":"object","properties":{"word":{"type":"string"},"relation":{"type":"string"},"fetched":{"type":"integer"}},"required":["word","relation","fetched"],"additionalProperties":false}},"required":["ok","items","total","source"],"additionalProperties":false},"meta":{"$ref":"#/components/schemas/CallMeta"}}}}}},"400":{"$ref":"#/components/responses/BadRequest"},"402":{"$ref":"#/components/responses/PaymentRequired"},"405":{"$ref":"#/components/responses/MethodNotAllowed"},"500":{"$ref":"#/components/responses/ServerError"},"502":{"$ref":"#/components/responses/UpstreamError"}},"x-2s-id":"word.related","x-2s-version":null,"x-2s-price":{"usd":0.003},"x-2s-accepts":["x402"],"x-2s-response-shape":"normalized","x-payment-info":{"price":{"mode":"fixed","currency":"USD","amount":"0.003000"},"protocols":[{"x402":{}}]},"parameters":[{"name":"word","in":"query","required":true,"description":"Word.","schema":{"type":"string","pattern":"^[a-zA-Z][a-zA-Z'.-]{0,49}$"}},{"name":"relation","in":"query","required":true,"description":"Relation.","schema":{"type":"string","enum":["rhymes","near-rhymes","synonyms","antonyms","means","triggers","homophones","sounds-like","spelled-like","follows-from","preceded-by"]}},{"name":"limit","in":"query","required":false,"description":"Maximum number of results to return.","schema":{"type":"integer","minimum":1,"maximum":100,"default":25}},{"$ref":"#/components/parameters/TrialMode"}]}}}}