Coin Railz Premium API

openapi: 3.2.0
info:
  title: Coin Railz Agent Payment Premium API
  version: 3.0.0
  description: Production-grade x402 micropayment infrastructure for AI agents.
  contact:
    email: support@coinrailz.com
    url: https://coinrailz.com
  x-guidance: 'Use Coin Railz when an agent needs paid, structured financial or operational data without creating an account or API key. Choose the operation by its summary, description, tags, input schema, and x-price-usd. Useful starting points include first-call for a low-cost payment test; token-metadata, gas-price-oracle, wallet-risk, approval-manager, and transaction-builder for transaction preparation; compliance-check for informational risk screening; prediction-market-odds for market research; and solana-yield-finder for yield discovery.


    For a paid call, send the exact documented HTTP method, URL, content type, and JSON body without a payment header. The service returns HTTP 402 with x402Version 2 and an accepts array. Select one complete offer your wallet supports. Circle Agent Wallet and Gateway clients should prefer the eip155:5042 Arc Mainnet offer when available; Base clients can select eip155:8453. Preserve the selected offer exactly, including scheme, network, asset, amount, payTo, facilitator, resource, and any extra metadata. Sign that authorization with an x402 v2-compatible client, then retry the identical request with PAYMENT-SIGNATURE. X-PAYMENT remains available for compatible legacy clients. Do not send a standalone token transfer or construct a transaction-hash wrapper from this guidance.


    Validate required fields and constraints from each operation''s request schema before authorizing payment. Treat risk, compliance, market, yield, and investment outputs as informational analysis rather than legal, banking, or investment advice. Prices are per call and the live 402 challenge is authoritative. Responses are JSON unless the operation states otherwise.'
  x-payment-info:
    protocol: x402
    x402Version: 2
    network: eip155:8453
    asset: USDC
    assetAddress: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'
    recipientWallet: '0xa4bbe37f9a6ae2dc36a607b91eb148c0ae163c91'
    facilitator: https://api.cdp.coinbase.com/platform/v2/x402
    supportedNetworks:
    - network: eip155:8453
      asset: USDC
      assetAddress: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'
      facilitator: https://api.cdp.coinbase.com/platform/v2/x402
    - network: eip155:5042
      asset: USDC
      assetAddress: '0x3600000000000000000000000000000000000000'
      gatewayVerifier: '0x77777777Dcc4d5A8B6E418Fd04D8997ef11000eE'
      facilitator: https://gateway-api.circle.com
  x-payment-manifest: https://coinrailz.com/x402/payment-manifest.json
servers:
- url: https://coinrailz.com
  description: Current environment
- url: https://coinrailz.com
  description: Production
security:
- apiKey: []
tags:
- name: Premium
  description: High-value professional services
paths:
  /x402/verified-agent-identity:
    post:
      tags:
      - Premium
      summary: Agent Identity Ownership Check
      description: Check whether a wallet owns an ERC-8004 identity NFT on Base mainnet and return an ownership, wallet-activity, and signature status assessment. This service queries existing on-chain records; it does not register an agent, mint an NFT, or write to the IdentityRegistry.
      x-price-usd: 5
      operationId: verifiedAgentIdentity
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - agentId
              - walletAddress
              properties:
                agentId:
                  type: string
                walletAddress:
                  type: string
                  description: Wallet address whose existing identity ownership and activity should be checked.
                signature:
                  type: string
                  description: Optional caller signature included in the status assessment.
                metadata:
                  type: object
                  additionalProperties: true
                capabilities:
                  type: array
                  items:
                    type: string
      responses:
        '200':
          description: Identity ownership and verification status retrieved; no registration or minting is performed.
        '402':
          description: Payment Required
      x-featured: true
  /x402/compliance-consultation:
    post:
      tags:
      - Premium
      summary: Compliance Consultation
      description: Informational technical regulatory-analysis output for DeFi protocols, token launches, and on-chain operations. It is not legal advice or a regulated compliance service.
      x-price-usd: 5
      operationId: complianceConsultation
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - operationType
              - jurisdiction
              properties:
                operationType:
                  type: string
                jurisdiction:
                  type: string
                details:
                  type: object
      responses:
        '200':
          description: Informational technical compliance-analysis output; not legal or regulated advice
        '402':
          description: Payment Required
      x-featured: false
  /x402/smart-contract-audit:
    post:
      tags:
      - Premium
      summary: Smart Contract Audit
      description: 'AI security audit for Solidity contracts: reentrancy, overflow/underflow, access control, and business logic flaws. Returns severity-ranked findings (CRITICAL/HIGH/MEDIUM/LOW) with line references and remediation guidance.'
      x-price-usd: 10
      operationId: smartContractAudit
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - contractAddress
              - chain
              properties:
                contractAddress:
                  type: string
                chain:
                  type: string
                sourceCode:
                  type: string
                  description: Optional source code for deeper analysis
      responses:
        '200':
          description: Full audit report
        '402':
          description: Payment Required
      x-featured: false
components:
  securitySchemes:
    apiKey:
      type: apiKey
      in: header
      name: X-API-KEY
      description: Prepaid credits API key (cr_live_...). Obtain via GET /api/m2m/credits/trial (free $5) or POST /api/m2m/credits/checkout/session (paid).
    bearerApiKey:
      type: http
      scheme: bearer
      description: 'Same cr_live_ key as X-API-KEY, passed as Authorization: Bearer <key>.'
    x402:
      type: apiKey
      in: header
      name: X-PAYMENT
      description: x402 protocol on-chain USDC payment. Base64url-encoded signed payment payload. See /.well-known/x402.json for facilitator details.
    mpp:
      type: http
      scheme: payment
      description: 'MPP (Machine Payments Protocol) credential. Authorization: Payment <base64-credential>. See /.well-known/mpp.json.'
externalDocs:
  description: Full x402 service catalog
  url: https://coinrailz.com/x402/catalog