{"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. Works on every endpoint.","schema":{"type":"integer","enum":[1]}}},"securitySchemes":{"x402Payment":{"type":"apiKey","in":"header","name":"PAYMENT-SIGNATURE","description":"x402 protocol v2: base64-encoded PaymentPayload. Call any paid endpoint without auth to receive a 402 with a multi-network PaymentRequirements envelope. Sign for either rail: EIP-3009 transferWithAuthorization (Base USDC) OR a partial SPL token transfer (Solana USDC). Retry with PAYMENT-SIGNATURE header. X-PAYMENT is also accepted for v1 buyer clients. 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. Pick any entry from accepts[], sign for that rail, retry with the PAYMENT-SIGNATURE header.","required":["x402Version","accepts"],"properties":{"x402Version":{"type":"integer","const":2},"error":{"type":"string","description":"Human-readable reason payment is required."},"resource":{"type":"string","description":"The resource URL being purchased."},"accepts":{"type":"array","description":"Payment requirement options, one per supported network (Base USDC, Solana USDC).","items":{"type":"object","required":["scheme","network","amount","asset","payTo","maxTimeoutSeconds"],"properties":{"scheme":{"type":"string","enum":["exact"]},"network":{"type":"string","description":"CAIP-2 network id, e.g. \"eip155:8453\" (Base) or \"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp\"."},"amount":{"type":"string","description":"Price in atomic asset units (USDC has 6 decimals)."},"asset":{"type":"string","description":"Asset contract address / mint."},"payTo":{"type":"string","description":"Treasury address to pay."},"maxTimeoutSeconds":{"type":"integer"},"extra":{"type":"object","description":"Rail-specific extras (EVM: EIP-712 domain name/version; Solana: feePayer).","additionalProperties":true}}}},"extensions":{"type":"object","description":"Optional discovery metadata (e.g. bazaar input/output schemas).","additionalProperties":true}}}}},"paths":{"/api/airport/lookup":{"get":{"tags":["airport"],"summary":"Look up an airport by 3-letter IATA (e.g.","description":"Look up an airport by 3-letter IATA (e.g. SFO) or 4-letter ICAO (e.g. KSFO) code. Query: code (3-5 chars, alphanumeric). Returns { airport: { id, ident, type, name, latitude, longitude, elevationFt, continent, isoCountry, isoRegion, municipality, scheduledService, icaoCode, iataCode, gpsCode, localCode, wikipediaLink } } or 404 NOT_FOUND.","operationId":"airport_lookup","deprecated":false,"security":[{"x402Payment":[]}],"responses":{"200":{"description":"Normalized envelope: items = [airport] (one OurAirports record); total = 1. 404 if no airport matches the code.","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":{"id":{"type":"integer","description":"OurAirports stable numeric id."},"ident":{"type":"string","description":"Globally unique identifier (usually ICAO)."},"type":{"type":"string","nullable":true,"description":"large_airport | medium_airport | small_airport | heliport | seaplane_base | closed."},"name":{"type":"string","nullable":true},"latitude":{"type":"number"},"longitude":{"type":"number"},"elevationFt":{"type":"integer","nullable":true},"continent":{"type":"string","nullable":true},"isoCountry":{"type":"string","nullable":true,"description":"ISO 3166-1 alpha-2 country code."},"isoRegion":{"type":"string","nullable":true,"description":"ISO 3166-2 region code (e.g. US-CA)."},"municipality":{"type":"string","nullable":true},"scheduledService":{"type":"boolean","nullable":true},"icaoCode":{"type":"string","nullable":true},"iataCode":{"type":"string","nullable":true},"gpsCode":{"type":"string","nullable":true},"localCode":{"type":"string","nullable":true},"wikipediaLink":{"type":"string","nullable":true}},"required":["id","ident","type","name","latitude","longitude","elevationFt","continent","isoCountry","isoRegion","municipality","scheduledService","icaoCode","iataCode","gpsCode","localCode","wikipediaLink"],"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":{"$ref":"#/components/responses/UpstreamError"}},"x-2s-id":"airport.lookup","x-2s-version":null,"x-2s-price":{"usd":0.0025},"x-2s-accepts":["x402"],"x-2s-response-shape":"normalized","x-payment-info":{"price":{"mode":"fixed","currency":"USD","amount":"0.002500"},"protocols":[{"x402":{}}]},"parameters":[{"name":"code","in":"query","required":true,"description":"3-letter IATA or 4-letter ICAO airport code (e.g. SFO, KSFO).","schema":{"type":"string","minLength":3,"maxLength":5}},{"$ref":"#/components/parameters/TrialMode"}]}},"/api/airport/near":{"get":{"tags":["airport"],"summary":"Airports within a radius of a coordinate, sorted by distance.","description":"Airports within a radius of a coordinate, sorted by distance. Query: lat (-90..90), lon (-180..180), radius_km (1-2000, default 200), limit (1-100, default 20), type (optional: large_airport|medium_airport|small_airport|heliport|seaplane_base|balloonport|closed), country (optional 2-letter ISO 3166-1), scheduled_service (optional bool, true = commercial-service airports only). Returns { query, count, airports: [{ id, ident, name, iataCode, icaoCode, type, latitude, longitude, distanceKm, ... }] }.","operationId":"airport_near","deprecated":false,"security":[{"x402Payment":[]}],"responses":{"200":{"description":"Normalized envelope: items = airports within radius_km, sorted by ascending distance; total = null (no upstream total; query-bounded set); meta.query echoes the search.","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":{"id":{"type":"integer"},"ident":{"type":"string"},"name":{"type":"string","nullable":true},"iataCode":{"type":"string","nullable":true},"icaoCode":{"type":"string","nullable":true},"type":{"type":"string","nullable":true},"latitude":{"type":"number"},"longitude":{"type":"number"},"distanceKm":{"type":"number","description":"Great-circle distance to (lat, lon), kilometers."},"isoCountry":{"type":"string","nullable":true},"isoRegion":{"type":"string","nullable":true},"municipality":{"type":"string","nullable":true},"scheduledService":{"type":"boolean","nullable":true}},"required":["id","ident","name","iataCode","icaoCode","type","latitude","longitude","distanceKm","isoCountry","isoRegion","municipality","scheduledService"],"additionalProperties":false}},"total":{"type":"integer","nullable":true,"description":"Total matching rows upstream; null when unknown."},"source":{"$ref":"#/components/schemas/Source"},"meta":{"type":"object","properties":{"query":{"type":"object","properties":{"latitude":{"type":"number"},"longitude":{"type":"number"},"radiusKm":{"type":"number"},"limit":{"type":"integer"},"type":{"type":"string","nullable":true},"country":{"type":"string","nullable":true},"scheduledServiceOnly":{"type":"boolean","nullable":true}},"required":["latitude","longitude","radiusKm","limit","type","country","scheduledServiceOnly"],"additionalProperties":false}},"required":["query"],"additionalProperties":false}},"required":["ok","items","total","source"],"additionalProperties":false},"meta":{"$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":{"$ref":"#/components/responses/UpstreamError"}},"x-2s-id":"airport.near","x-2s-version":null,"x-2s-price":{"usd":0.0025},"x-2s-accepts":["x402"],"x-2s-response-shape":"normalized","x-payment-info":{"price":{"mode":"fixed","currency":"USD","amount":"0.002500"},"protocols":[{"x402":{}}]},"parameters":[{"name":"lat","in":"query","required":true,"description":"Latitude in decimal degrees (-90 to 90).","schema":{"type":"number","minimum":-90,"maximum":90}},{"name":"lon","in":"query","required":true,"description":"Longitude in decimal degrees (-180 to 180).","schema":{"type":"number","minimum":-180,"maximum":180}},{"name":"radius_km","in":"query","required":false,"description":"Search radius in kilometers (1-2000). Default 200.","schema":{"type":"number","minimum":1,"maximum":2000,"default":200}},{"name":"limit","in":"query","required":false,"description":"Max airports to return (1-100). Default 20.","schema":{"type":"integer","minimum":1,"maximum":100,"default":20}},{"name":"type","in":"query","required":false,"description":"Filter by airport type.","schema":{"type":"string","enum":["large_airport","medium_airport","small_airport","heliport","seaplane_base","balloonport","closed"]}},{"name":"country","in":"query","required":false,"description":"Filter by ISO 3166-1 alpha-2 country code (e.g. US).","schema":{"type":"string","pattern":"^[A-Z]{2}$"}},{"name":"scheduled_service","in":"query","required":false,"description":"When true, only commercial-service airports.","schema":{"type":"boolean"}},{"$ref":"#/components/parameters/TrialMode"}]}}}}