openapi: 3.2.0
info:
  title: 2s — the (most) everything Aviation API
  version: '1'
  summary: The (most) everything API.
  description: 'The (most) everything API for AI agents: 575+ pay-per-call endpoints on one origin.'
  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
tags:
- name: aviation
paths:
  /api/aviation/accidents:
    get:
      tags:
      - aviation
      summary: Search the NTSB civil aviation accident & incident database
      description: 'Search the NTSB civil aviation accident & incident database (CAROL) — US events from 1962 to present plus selected foreign investigations. Filter by aircraft registration (N-number, partial match), US state (2-letter code or name), make, model, city, and/or event date range (dateFrom/dateTo as YYYY-MM-DD). At least one filter is required. Returns matching events newest-first: NTSB number, event date/type, city/state/country, aircraft registration(s)/make(s)/model(s), highest injury level, onboard & on-ground injury counts, report type/status, and a link to the official NTSB case page. Data: NTSB (U.S. public domain), live. For aviation safety research, fleet/tail-number history, incident due-diligence, and accident-trend analysis.'
      operationId: aviation_accidents
      deprecated: false
      security:
      - x402Payment: []
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: object
                required:
                - data
                - meta
                properties:
                  data:
                    type: object
                    properties:
                      query:
                        type: object
                        additionalProperties:
                          anyOf:
                          - not: {}
                          - anyOf:
                            - type: string
                            - type: number
                      total:
                        type: number
                      truncated:
                        type: boolean
                      count:
                        type: number
                      items:
                        type: array
                        items:
                          type: object
                          properties:
                            ntsbNumber:
                              type: string
                              nullable: true
                            mkey:
                              type: string
                              nullable: true
                            eventType:
                              type: string
                              nullable: true
                            eventDate:
                              type: string
                              nullable: true
                            city:
                              type: string
                              nullable: true
                            state:
                              type: string
                              nullable: true
                            country:
                              type: string
                              nullable: true
                            registration:
                              type: array
                              items:
                                type: string
                            make:
                              type: array
                              items:
                                type: string
                            model:
                              type: array
                              items:
                                type: string
                            highestInjuryLevel:
                              type: string
                              nullable: true
                            injuriesOnboard:
                              type: number
                              nullable: true
                            injuriesOnGround:
                              type: number
                              nullable: true
                            reportType:
                              type: string
                              nullable: true
                            reportStatus:
                              type: string
                              nullable: true
                            reportUrl:
                              type: string
                              nullable: true
                          required:
                          - ntsbNumber
                          - mkey
                          - eventType
                          - eventDate
                          - city
                          - state
                          - country
                          - registration
                          - make
                          - model
                          - highestInjuryLevel
                          - injuriesOnboard
                          - injuriesOnGround
                          - reportType
                          - reportStatus
                          - reportUrl
                          additionalProperties: false
                      source:
                        $ref: '#/components/schemas/Source'
                    required:
                    - query
                    - total
                    - truncated
                    - count
                    - items
                    - 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':
          $ref: '#/components/responses/UpstreamError'
      x-2s-id: aviation.accidents
      x-2s-version: null
      x-2s-price:
        usd: 0.003
      x-2s-accepts:
      - x402
      x-2s-response-shape: legacy
      x-payment-info:
        price:
          mode: fixed
          currency: USD
          amount: '0.003000'
        protocols:
        - x402: {}
      parameters:
      - name: registration
        in: query
        required: false
        description: Aircraft registration / N-number (partial match).
        schema:
          type: string
          minLength: 1
          maxLength: 20
      - name: state
        in: query
        required: false
        description: US state, 2-letter code or full name.
        schema:
          type: string
          minLength: 2
          maxLength: 40
      - name: make
        in: query
        required: false
        description: Aircraft make (partial match), e.g. Cessna.
        schema:
          type: string
          minLength: 1
          maxLength: 60
      - name: model
        in: query
        required: false
        description: Aircraft model (partial match), e.g. 172.
        schema:
          type: string
          minLength: 1
          maxLength: 60
      - name: city
        in: query
        required: false
        description: Event city (partial match).
        schema:
          type: string
          minLength: 1
          maxLength: 80
      - name: dateFrom
        in: query
        required: false
        description: Earliest event date, YYYY-MM-DD.
        schema:
          type: string
          pattern: ^\d{4}-\d{2}-\d{2}$
      - name: dateTo
        in: query
        required: false
        description: Latest event date, YYYY-MM-DD.
        schema:
          type: string
          pattern: ^\d{4}-\d{2}-\d{2}$
      - name: limit
        in: query
        required: false
        description: Max records to return (1-100, default 25).
        schema:
          type: integer
          minimum: 1
          maximum: 100
          default: 25
      - $ref: '#/components/parameters/TrialMode'
  /api/aviation/metar:
    get:
      tags:
      - aviation
      summary: Current aviation weather observation (METAR) for one or
      description: 'Current aviation weather observation (METAR) for one or more airports. Pass ids = comma-separated ICAO station ids (e.g. KATL, EGLL, KJFK). Returns the raw METAR plus decoded fields: flight category (VFR/MVFR/IFR/LIFR), temperature + dewpoint (°C), wind direction/speed/gust (kt), visibility, altimeter (inHg), and cloud layers. Source: NOAA Aviation Weather Center (keyless, public domain).'
      operationId: aviation_metar
      deprecated: false
      security:
      - x402Payment: []
      responses:
        '200':
          description: 'Normalized envelope: items = METAR observations (one per station); total = 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:
                            station:
                              type: string
                            observedAt:
                              type: string
                              nullable: true
                            raw:
                              type: string
                              nullable: true
                            flightCategory:
                              type: string
                              nullable: true
                            tempC:
                              type: number
                              nullable: true
                            dewpointC:
                              type: number
                              nullable: true
                            windDirDeg:
                              type: number
                              nullable: true
                            windSpeedKt:
                              type: number
                              nullable: true
                            windGustKt:
                              type: number
                              nullable: true
                            visibility:
                              type: string
                              nullable: true
                            altimeterInHg:
                              type: number
                              nullable: true
                            clouds:
                              type: array
                              items:
                                type: object
                                properties:
                                  cover:
                                    type: string
                                  baseFtAgl:
                                    type: number
                                    nullable: true
                                required:
                                - cover
                                - baseFtAgl
                                additionalProperties: false
                            name:
                              type: string
                              nullable: true
                          required:
                          - station
                          - observedAt
                          - raw
                          - flightCategory
                          - tempC
                          - dewpointC
                          - windDirDeg
                          - windSpeedKt
                          - windGustKt
                          - visibility
                          - altimeterInHg
                          - clouds
                          - name
                          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: aviation.metar
      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: ids
        in: query
        required: true
        description: Comma-separated list of identifiers.
        schema:
          type: string
          minLength: 3
          maxLength: 120
      - $ref: '#/components/parameters/TrialMode'
  /api/aviation/sigmet:
    get:
      tags:
      - aviation
      summary: Active in-flight weather hazard advisories (SIGMETs and
      description: Active in-flight weather hazard advisories (SIGMETs and AIRMETs) from the NOAA Aviation Weather Center. Returns current advisories over a lookback window (1-24h), optionally filtered by hazard (CONVECTIVE, TURB turbulence, ICE icing, IFR, MTN OBSCN mountain obscuration, ASH volcanic ash). Each advisory carries the issuing office, type (SIGMET/AIRMET/OUTLOOK), hazard, severity, valid-from/to times, affected altitude band (feet MSL), movement (direction/speed), and the raw text bulletin. Keyless, public-domain (NOAA). The active-hazard layer aviation agents need — distinct from aviation.metar (station conditions) and aviation.taf (forecasts). Not for navigation.
      operationId: aviation_sigmet
      deprecated: false
      security:
      - x402Payment: []
      responses:
        '200':
          description: 'Normalized envelope: items = active advisories (sliced to limit); total = match 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:
                            icaoId:
                              type: string
                              nullable: true
                            type:
                              type: string
                              nullable: true
                            hazard:
                              type: string
                              nullable: true
                            severity:
                              type: string
                              nullable: true
                            validFrom:
                              type: string
                              nullable: true
                            validTo:
                              type: string
                              nullable: true
                            altitudeLowFt:
                              type: number
                              nullable: true
                            altitudeHiFt:
                              type: number
                              nullable: true
                            movementDirDeg:
                              type: number
                              nullable: true
                            movementSpeedKt:
                              type: number
                              nullable: true
                            raw:
                              type: string
                              nullable: true
                          required:
                          - icaoId
                          - type
                          - hazard
                          - severity
                          - validFrom
                          - validTo
                          - altitudeLowFt
                          - altitudeHiFt
                          - movementDirDeg
                          - movementSpeedKt
                          - raw
                          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: aviation.sigmet
      x-2s-version: null
      x-2s-price:
        usd: 0.0027
      x-2s-accepts:
      - x402
      x-2s-response-shape: normalized
      x-payment-info:
        price:
          mode: fixed
          currency: USD
          amount: '0.002700'
        protocols:
        - x402: {}
      parameters:
      - name: hazard
        in: query
        required: false
        description: Hazard.
        schema:
          type: string
          minLength: 2
          maxLength: 20
      - name: hours
        in: query
        required: false
        description: Look-back window, in hours.
        schema:
          type: integer
          minimum: 1
          maximum: 24
      - name: limit
        in: query
        required: false
        description: Maximum number of results to return.
        schema:
          type: integer
          minimum: 1
          maximum: 50
      - $ref: '#/components/parameters/TrialMode'
  /api/aviation/taf:
    get:
      tags:
      - aviation
      summary: Terminal Aerodrome Forecast (TAF) for one or more airports
      description: 'Terminal Aerodrome Forecast (TAF) for one or more airports — the official aviation forecast issued for an airport (~24–30h ahead). Pass ids = comma-separated ICAO station ids (e.g. KATL). Returns the raw TAF text + issue time. Source: NOAA Aviation Weather Center (keyless). For current conditions use aviation.metar.'
      operationId: aviation_taf
      deprecated: false
      security:
      - x402Payment: []
      responses:
        '200':
          description: 'Normalized envelope: items = TAFs (one per station); total = 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:
                            station:
                              type: string
                            issuedAt:
                              type: string
                              nullable: true
                            raw:
                              type: string
                              nullable: true
                            name:
                              type: string
                              nullable: true
                          required:
                          - station
                          - issuedAt
                          - raw
                          - name
                          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: aviation.taf
      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: ids
        in: query
        required: true
        description: Comma-separated list of identifiers.
        schema:
          type: string
          minLength: 3
          maxLength: 120
      - $ref: '#/components/parameters/TrialMode'
components:
  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
  responses:
    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'
    UpstreamError:
      description: Upstream provider error.
    MethodNotAllowed:
      description: Method not allowed — see `Allow` header for the supported method.
    ServerError:
      description: Internal server error.
    BadRequest:
      description: Bad request — invalid parameters.
  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.'