ExchangeRebel Tx Presign Check 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: Tx Presign Check
paths:
  /toll/txcheck/check:
    post:
      tags:
      - Tx Presign Check
      summary: Pre-sign verdict for an unsigned Solana transaction
      responses:
        '200':
          description: Success. Response shape is documented in the service catalog (GET /health on the service).
          content:
            application/json:
              example:
                verdict: ALLOW
                summary: No drain-class flags found and simulation succeeded; nothing in the checked effects contradicts signing.
                flags: []
                deltas:
                - asset: SOL
                  mint: null
                  pre: '1'
                  post: '0.999995'
                  delta: '-0.000005'
                - asset: SOL
                  mint: null
                  pre: '0.0000005'
                  post: '0.0000055'
                  delta: '0.000005'
                authority_changes: []
                policy:
                  applied: false
                  violations: []
                simulation:
                  simulated: true
                  sig_verified: false
                  blockhash_replaced: true
                  degraded: false
                  slot: 424242
                  err: null
                  units_consumed: 150
                  programs_invoked:
                  - '11111111111111111111111111111111'
                  upstream: solana-rpc.publicnode.com
                inputs_summary:
                  instructions: 1
                  inner_instructions: 0
                  accounts: 3
                  version: legacy
                envelope:
                  v: 1
                  service: tx-presign-check
                  source: static transaction decode + Solana RPC simulation (publicnode / api.mainnet-beta)
                  grade: derived
                  max_age_seconds: 30
                  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:
                tx:
                  type: string
                  description: string - base64 unsigned transaction (required)
                policy:
                  type: object
                  description: 'object (optional): {max_sol_out_lamports, max_token_out_bps_by_mint {mint: bps}, allowed_programs, blocked_programs, blocked_addresses, fail_on_unknown_program}'
              required:
              - tx
      x-payment-info:
        protocols:
        - x402
        price:
          mode: fixed
          currency: USD
          amount: '0.01'
      security:
      - x402Payment: []
      operationId: postTollTxcheckCheck
      x-operation-id-source: derived
  /toll/txcheck/schema:
    get:
      tags:
      - Tx Presign Check
      summary: Request/response schema for the pre-sign check
      responses:
        '200':
          description: Success. Response shape is documented in the service catalog (GET /health on the service).
      security: []
      operationId: getTollTxcheckSchema
      x-operation-id-source: derived
  /toll/txcheck/health:
    get:
      tags:
      - Tx Presign Check
      summary: Service info + endpoint catalog
      responses:
        '200':
          description: Success. Response shape is documented in the service catalog (GET /health on the service).
      security: []
      operationId: getTollTxcheckHealth
      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.'