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OpenAPI Specification

openapi: 3.2.0
info:
  title: ExchangeRebel — pay-per-call APIs for AI agents (x402 on…
  version: 1.0.0
  contact:
    name: 'ExchangeRebel (operator: Rebel Data)'
    url: https://exchangerebel.com
    email: sound.money.investing@gmail.com
  x-guidance: 'All paid operations use x402 on Solana: call without payment to get a 402 challenge (SOL recipient + USDC token account + fresh memo), pay with the memo attached via the Solana Memo program, then retry with header X-Payment-Tx: <signature> and ?toll_memo=<memo>. Challenges are dual-version: the PAYMENT-REQUIRED header carries the x402 v2 PaymentRequired object and the response body carries the same challenge in x402 v1 form for compatibility. Free operations (security: []) include each service''s /health catalog with full response shapes. Prices in x-payment-info are USD per call unless the summary says otherwise (RPC is per 1,000-request block; Telegram provisioning is per bot-month; transcription is per minute of audio).'
  description: '67 data and utility APIs behind x402 tolls, settled in SOL or USDC on Solana. Call a paid endpoint without payment to receive a 402 x402 challenge (recipient + fresh memo), pay with the memo attached via the Solana Memo program, then retry with the X-Payment-Tx header and toll_memo query parameter. Free catalog/health endpoints are marked without x-payment-info. Full catalogs: GET /toll/discovery and each service''s /health.'
servers:
- url: https://exchangerebel.com
tags:
- name: Carbon Intensity
paths:
  /toll/carbon/intensity:
    post:
      tags:
      - Carbon Intensity
      summary: Current average grid carbon intensity for one zone
      responses:
        '200':
          description: Success. Response shape is documented in the service catalog (GET /health on the service).
          content:
            application/json:
              example:
                zone: FR
                average_intensity_gco2_per_kwh: 28
                as_of: '2026-10-16T15:00:00+00:00'
                generation_mix_mw:
                  nuclear: 38083
                cache:
                  state: miss
                provenance:
                  source: RTE via ODRE — dataset eco2mix-national-tr
                  licence: Licence Ouverte v2.0 (Etalab)
                  attribution: 'Source: RTE / ODRE, dataset eco2mix-national-tr (Licence Ouverte v2.0).'
                  method: direct
                  revision_note: Real-time values are estimates subject to consolidation by the source; previously served values can be revised as the source consolidates its data.
                envelope:
                  v: 1
                  service: carbon-intensity
                  as_of: '2026-10-16T15:00:00+00:00'
                  source: RTE via ODRE — dataset eco2mix-national-tr
                  grade: official
                  changes:
                    supported: false
                kind: current
        '402':
          description: 'Payment Required (x402). The PAYMENT-REQUIRED response header carries the x402 v2 PaymentRequired object (base64 JSON: scheme, CAIP-2 network, amount, asset, payTo, plus the bazaar discovery extension); the response body carries the same challenge in x402 v1 form for compatibility, naming the SOL recipient and USDC token account on Solana plus a fresh memo. To pay on this service''s rail: pay with the memo attached (Solana Memo program), then retry with header ''X-Payment-Tx: <transaction signature>'' and query parameter ''toll_memo=<memo>''.'
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                zone:
                  type: string
                  description: 'string (required) - zone code: FR, DE, GB, IE, DK or US'
              required:
              - zone
      x-payment-info:
        protocols:
        - x402
        price:
          mode: fixed
          currency: USD
          amount: '0.005'
      security:
      - x402Payment: []
      operationId: postTollCarbonIntensity
      x-operation-id-source: derived
  /toll/carbon/intensity/forecast:
    post:
      tags:
      - Carbon Intensity
      summary: Forecast average carbon intensity curve for one zone
      responses:
        '200':
          description: Success. Response shape is documented in the service catalog (GET /health on the service).
          content:
            application/json:
              example:
                zone: GB
                kind: forecast
                label: forecast
                points:
                - at: 2026-10-16T14:30Z
                  average_intensity_gco2_per_kwh: 97
                  kind: forecast
                points_count: 97
                provenance:
                  source: NESO Carbon Intensity API
                  licence: CC BY 4.0
                  attribution: NESO — Carbon Intensity API (CC BY 4.0). GB is served only as one zone of this multi-region product.
                  method: direct
                  revision_note: Real-time values are estimates subject to consolidation by the source; previously served values can be revised as the source consolidates its data.
                envelope:
                  v: 1
                  service: carbon-intensity
                  source: NESO Carbon Intensity API
                  grade: official
                  changes:
                    supported: false
        '402':
          description: 'Payment Required (x402). The PAYMENT-REQUIRED response header carries the x402 v2 PaymentRequired object (base64 JSON: scheme, CAIP-2 network, amount, asset, payTo, plus the bazaar discovery extension); the response body carries the same challenge in x402 v1 form for compatibility, naming the SOL recipient and USDC token account on Solana plus a fresh memo. To pay on this service''s rail: pay with the memo attached (Solana Memo program), then retry with header ''X-Payment-Tx: <transaction signature>'' and query parameter ''toll_memo=<memo>''.'
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                zone:
                  type: string
                  description: 'string (required) - zone code: GB, IE or DK for forecast'
              required:
              - zone
      x-payment-info:
        protocols:
        - x402
        price:
          mode: fixed
          currency: USD
          amount: '0.01'
      security:
      - x402Payment: []
      operationId: postTollCarbonIntensityForecast
      x-operation-id-source: derived
  /toll/carbon/zones:
    get:
      tags:
      - Carbon Intensity
      summary: 'Carbon intensity zone catalog: metadata + factors'
      responses:
        '200':
          description: Success. Response shape is documented in the service catalog (GET /health on the service).
      security: []
      operationId: getTollCarbonZones
      x-operation-id-source: derived
  /toll/carbon/health:
    get:
      tags:
      - Carbon Intensity
      summary: Check the carbon intensity service status
      responses:
        '200':
          description: Success. Response shape is documented in the service catalog (GET /health on the service).
      security: []
      operationId: getTollCarbonHealth
      x-operation-id-source: derived
components:
  securitySchemes:
    x402Payment:
      type: apiKey
      in: header
      name: X-Payment-Tx
      description: 'x402 toll payment proof: the Solana transaction signature of a payment carrying the memo from the 402 challenge; send together with ?toll_memo=<memo>. Payment itself is made on-chain in SOL or USDC to the recipient named in the challenge.'