ExchangeRebel Wikipedia Answers API

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: Wikipedia Answers
paths:
  /toll/wiki/answer:
    get:
      tags:
      - Wikipedia Answers
      summary: Answer a query from Wikipedia content
      responses:
        '200':
          description: Success. Response shape is documented in the service catalog (GET /health on the service).
          content:
            application/json:
              example:
                query: solana
                title: Solana (blockchain platform)
                description: Blockchain platform
                summary: Solana is a blockchain platform which uses a proof-of-stake mechanism...
                url: https://en.wikipedia.org/wiki/Solana_(blockchain_platform)
                image: https://upload.wikimedia.org/wikipedia/en/b/b9/Solana_logo.png
                categories:
                - Blockchains
                - Cryptocurrencies
                last_updated: '2026-10-10T14:22:01Z'
                license: CC BY-SA 4.0
                attribution: Wikipedia contributors
                cached: false
                paid_via: payai
                envelope:
                  v: 1
                  service: wikipedia-answers
                  as_of: '2026-10-10T14:22:01Z'
                  source: wikipedia
                  grade: primary
                  capture_cadence: 1h
                  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>''.'
      parameters:
      - name: q
        in: query
        required: true
        schema:
          type: string
        description: Question or topic
      x-payment-info:
        protocols:
        - x402
        price:
          mode: fixed
          currency: USD
          amount: '0.005'
      security:
      - x402Payment: []
      operationId: getTollWikiAnswer
      x-operation-id-source: derived
  /toll/wiki/related:
    get:
      tags:
      - Wikipedia Answers
      summary: Articles linked from the resolved Wikipedia page
      responses:
        '200':
          description: Success. Response shape is documented in the service catalog (GET /health on the service).
          content:
            application/json:
              example:
                query: solana
                title: Solana (blockchain platform)
                related:
                - Proof of stake
                - Solana Labs
                - Smart contract
                count: 3
                envelope:
                  v: 1
                  service: wikipedia-answers
                  as_of: '2026-10-10T14:22:01Z'
                  source: wikipedia
                  grade: primary
                  capture_cadence: 1h
                  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>''.'
      parameters:
      - name: q
        in: query
        required: true
        schema:
          type: string
        description: Question or topic
      - name: limit
        in: query
        required: false
        schema:
          type: string
        description: Max 50, default 10
      x-payment-info:
        protocols:
        - x402
        price:
          mode: fixed
          currency: USD
          amount: '0.005'
      security:
      - x402Payment: []
      operationId: getTollWikiRelated
      x-operation-id-source: derived
  /toll/wiki/health:
    get:
      tags:
      - Wikipedia Answers
      summary: Service status, upstreams, tolls, license
      responses:
        '200':
          description: Success. Response shape is documented in the service catalog (GET /health on the service).
      security: []
      operationId: getTollWikiHealth
      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.'