Coin Railz Real Estate API

openapi: 3.2.0
info:
  title: Coin Railz Agent Payment Real Estate 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: Real Estate
  description: Property and construction analytics
paths:
  /x402/property-valuation:
    post:
      tags:
      - Real Estate
      summary: Property Valuation
      description: AI-powered real estate property valuation using comparable sales, zoning data, and market trends. Returns estimated value range with confidence interval and key value drivers.
      x-price-usd: 0.75
      operationId: propertyValuation
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - address
              properties:
                address:
                  type: string
                propertyType:
                  type: string
                squareFeet:
                  type: number
      responses:
        '200':
          description: Property valuation estimate
        '402':
          description: Payment Required
      x-featured: false
  /x402/lease-analysis:
    post:
      tags:
      - Real Estate
      summary: Lease Analysis
      description: Commercial lease terms extraction and risk analysis. Returns key clauses (rent escalation, break options, TI allowance), market rate comparison, and red-flag summary.
      x-price-usd: 1
      operationId: leaseAnalysis
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - leaseTerms
              properties:
                leaseTerms:
                  type: object
                marketData:
                  type: object
      responses:
        '200':
          description: Lease analysis report
        '402':
          description: Payment Required
      x-featured: false
  /x402/construction-progress:
    post:
      tags:
      - Real Estate
      summary: Construction Progress Tracker
      description: Construction site progress assessment using multi-source satellite imagery and AI analysis. Input site coordinates and date range; returns phase classification and change detection report.
      x-price-usd: 1.5
      operationId: constructionProgress
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - projectId
              properties:
                projectId:
                  type: string
                milestones:
                  type: array
      responses:
        '200':
          description: Progress 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