Coin Railz Investment API

openapi: 3.2.0
info:
  title: Coin Railz Agent Payment Investment 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: Investment
  description: Trading signals and portfolio optimization
paths:
  /x402/trade-signals:
    post:
      tags:
      - Investment
      summary: AI Trade Signals
      description: AI crypto trading signals with entry price, stop-loss, take-profit, position size recommendation, and risk/reward ratio. Based on technical indicators and on-chain flow analysis.
      x-price-usd: 0.75
      operationId: tradeSignals
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                token:
                  type: string
                  default: BTC/USDT
                timeframe:
                  type: string
                  enum:
                  - 5m
                  - 15m
                  - 1h
                  - 4h
                  - 1d
                riskLevel:
                  type: string
                  enum:
                  - low
                  - medium
                  - high
      responses:
        '200':
          description: Trading signal
          content:
            application/json:
              schema:
                type: object
                properties:
                  signal:
                    type: string
                  entry:
                    type: number
                  target:
                    type: number
                  stopLoss:
                    type: number
        '402':
          description: Payment Required
      x-featured: false
  /x402/sentiment-analysis:
    post:
      tags:
      - Investment
      summary: Market Sentiment Analysis
      description: Aggregated market sentiment for any crypto asset from X/Twitter, Reddit, and news sources. Returns bullish/bearish score (0-100), momentum signal, and 24h sentiment delta.
      x-price-usd: 0.5
      operationId: sentimentAnalysis
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - query
              properties:
                query:
                  type: string
                sources:
                  type: array
                  items:
                    type: string
      responses:
        '200':
          description: Sentiment analysis
        '402':
          description: Payment Required
      x-featured: false
  /x402/trading-signal:
    post:
      tags:
      - Investment
      summary: Trading Signal Generator
      description: Technical analysis signals — RSI, MACD, Bollinger Bands, volume profile, and trend strength — for any crypto pair. Returns buy/sell/hold verdict with confidence interval and key price levels.
      x-price-usd: 1
      operationId: tradingSignal
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - pair
              properties:
                pair:
                  type: string
                timeframe:
                  type: string
                indicators:
                  type: array
                  items:
                    type: string
      responses:
        '200':
          description: Trading signal with confidence
        '402':
          description: Payment Required
      x-featured: false
  /x402/portfolio-optimization:
    post:
      tags:
      - Investment
      summary: Portfolio Optimization
      description: AI crypto portfolio rebalancing using Modern Portfolio Theory. Input current holdings and risk tolerance; returns target allocation with projected Sharpe ratio and expected return improvement.
      x-price-usd: 2
      operationId: portfolioOptimization
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - holdings
              properties:
                holdings:
                  type: array
                riskTolerance:
                  type: string
                  enum:
                  - low
                  - medium
                  - high
                targetReturn:
                  type: number
      responses:
        '200':
          description: Optimized portfolio allocation
        '402':
          description: Payment Required
      x-featured: false
  /x402/stock-sentiment:
    post:
      tags:
      - Investment
      summary: Stock Sentiment Analysis
      description: AI stock sentiment for any ticker integrating earnings transcripts, news flow, options flow, and institutional positioning. Returns directional bias with short and medium-term signal strength.
      x-price-usd: 0.4
      operationId: stockSentiment
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - symbol
              properties:
                symbol:
                  type: string
                  description: Stock ticker symbol (e.g., AAPL, TSLA, NVDA)
      responses:
        '200':
          description: Stock sentiment analysis with news and technical indicators
        '402':
          description: Payment Required
      x-featured: false
  /x402/forex-sentiment:
    post:
      tags:
      - Investment
      summary: Forex Sentiment Analysis
      description: AI forex sentiment for major currency pairs integrating central bank signals, economic indicators, and news flow. Returns directional bias (bullish/bearish), confidence score, and top driving factors.
      x-price-usd: 0.4
      operationId: forexSentiment
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - pair
              properties:
                pair:
                  type: string
                  description: Currency pair (e.g., EUR/USD, GBP/JPY, USD/CHF)
      responses:
        '200':
          description: Forex sentiment analysis with economic indicators
        '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