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 .' 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 . See /.well-known/mpp.json.' externalDocs: description: Full x402 service catalog url: https://coinrailz.com/x402/catalog