Coin Railz RWA & Tokenization API

openapi: 3.2.0
info:
  title: Coin Railz Agent Payment RWA & Tokenization 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: RWA & Tokenization
paths:
  /x402/rwa-nav-oracle:
    post:
      tags:
      - RWA & Tokenization
      summary: RWA Synthetic NAV Oracle
      description: Synthetic market-based NAV estimate for RWA tokens (real estate, private credit, tokenized treasuries). Returns current NAV per share, implied yield, and protocol metadata.
      x-price-usd: 0.5
      operationId: rwaNavOracle
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              properties:
                asset_name:
                  type: string
                  description: RWA token name or identifier
                rwa_address:
                  type: string
                  description: On-chain contract address of the RWA token
                asset_type:
                  type: string
                  enum:
                  - real-estate
                  - private-credit
                  - treasury
                  - commodity
                  - other
                chain:
                  type: string
                  default: base
                include_signature:
                  type: boolean
                  default: true
                  description: Include EIP-712 signed attestation
      responses:
        '200':
          description: Synthetic NAV estimate with EIP-712 attestation
        '402':
          description: Payment Required — $0.50 USDC on Base
      x-featured: true
  /x402/tokenized-yield-compare:
    post:
      tags:
      - RWA & Tokenization
      summary: Tokenized Treasury Yield Comparison
      description: 'Live APY comparison across tokenized RWA protocols: Ondo (USDY), Backed (bIB01), Superstate (USTB), Mountain Protocol (USDM), OpenEden (TBILL), Hashnote (USYC), Maple Finance. Sourced from DeFi Llama.'
      x-price-usd: 0.25
      operationId: tokenizedYieldCompare
      requestBody:
        required: false
        content:
          application/json:
            schema:
              type: object
              properties:
                tokens:
                  type: array
                  items:
                    type: string
                  description: Filter by token symbols (e.g. ["USDY","USTB"]). Omit for all.
                chain:
                  type: string
                  description: Filter by chain
      responses:
        '200':
          description: Yield comparison table with benchmark statistics
        '402':
          description: Payment Required — $0.25 USDC on Base
      x-featured: true
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