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Stellar Horizon API Integration

Overview

This document describes the integration of the Stellar Horizon API to replace mock token data with live blockchain data.

Features Implemented

✅ Live Data Integration

  • Connection: Connects to Stellar Horizon Testnet (https://horizon-testnet.stellar.org)
  • Real-time Data: Fetches live asset information including:
    • Asset type (native, credit_alphanum4, credit_alphanum12)
    • Asset code (symbol)
    • Asset issuer address
    • Current supply/amount
    • Number of accounts holding the asset
    • Asset flags (auth_required, auth_revocable)

✅ Enhanced Endpoints

GET /tokens

  • Purpose: Search for Stellar assets by symbol or issuer
  • Query Parameter: search (optional)
  • Response: Live Stellar asset data with caching
  • Example: GET /tokens?search=USDC

GET /tokens/asset/:assetCode/:assetIssuer (New)

  • Purpose: Get detailed information about a specific asset
  • Parameters:
    • assetCode: Asset symbol (e.g., USDC)
    • assetIssuer: Asset issuer public key
  • Response: Complete asset details from Horizon API

✅ Performance Features

  • Caching: 5-minute cache for asset data to improve performance
  • Fallback: Mock data fallback if Horizon API is unavailable
  • Error Handling: Comprehensive error handling and logging

✅ Security & Reliability

  • Rate Limiting: Respects Horizon API rate limits
  • Error Recovery: Graceful degradation when API is unavailable
  • Input Validation: Proper validation of search queries

Technical Implementation

Files Modified/Created

src/tokens/
├── tokens.controller.ts    # Updated to use live Stellar data
├── tokens.service.ts      # New service for Horizon API integration
└── tokens.module.ts       # Updated to include service

Dependencies

  • @stellar/stellar-sdk: Official Stellar SDK (already installed)
  • NestJS framework components

Code Structure

TokensService

  • Horizon Connection: Establishes connection to testnet
  • Asset Fetching: fetchAssetsFromHorizon() method
  • Caching Logic: 5-minute cache with timestamp validation
  • Fallback Data: Mock data for API failures

TokensController

  • Updated Endpoints: Now use service layer
  • Error Handling: HTTP status codes for API failures
  • Documentation: Updated Swagger documentation

API Response Format

Search Response

{
  "message": "Search results for: USDC",
  "searchQuery": "USDC",
  "results": [
    {
      "asset_type": "credit_alphanum4",
      "asset_code": "USDC",
      "asset_issuer": "GBBD47F6L3WRUIRDRN4Q3GUMF3VUEQBQO4FSKJ3DFOZQY2E4PWSJD3HU",
      "amount": "1000000.0000000",
      "num_accounts": 150,
      "flags": {
        "auth_required": false,
        "auth_revocable": false
      }
    }
  ],
  "cached": false
}

Specific Asset Response

{
  "_links": {
    "self": {"href": "..."},
    "issuer": {"href": "..."}
  },
  "asset_type": "credit_alphanum4",
  "asset_code": "USDC",
  "asset_issuer": "GBBD47F6L3WRUIRDRN4Q3GUMF3VUEQBQO4FSKJ3DFOZQY2E4PWSJD3HU",
  "amount": "1000000.0000000",
  "num_accounts": 150,
  "flags": {
    "auth_required": false,
    "auth_revocable": false
  }
}

Testing

Manual Testing

  1. Start the development server: npm run start:dev
  2. Test the endpoints: 
    # Search for USDC
curl "http://localhost:3000/tokens?search=USDC"

# Get specific asset details
curl "http://localhost:3000/tokens/asset/USDC/GBBD47F6L3WRUIRDRN4Q3GUMF3VUEQBQO4FSKJ3DFOZQY2E4PWSJD3HU"

Test Script

Run the provided test script:

node test-stellar-integration.js

Benefits

✅ Real Web3 Integration

  • Live Data: No more hardcoded mock data
  • Real-time: Current asset information from the blockchain
  • Scalable: Can handle any Stellar asset

✅ Production Ready

  • Error Handling: Graceful failure handling
  • Performance: Caching reduces API calls
  • Monitoring: Built-in logging for debugging

✅ Developer Experience

  • Documentation: Updated Swagger docs
  • Type Safety: TypeScript implementation
  • Maintainable: Clean service architecture

Future Enhancements

Potential Improvements

  1. Mainnet Support: Add configuration for mainnet vs testnet
  2. Asset Validation: Verify asset authenticity
  3. Historical Data: Add historical price/supply data
  4. WebSocket: Real-time updates via Horizon streaming
  5. Rate Limiting: Implement client-side rate limiting

Additional Endpoints

  • GET /tokens/top - Top assets by supply/accounts
  • GET /tokens/issuer/:address - All assets from specific issuer
  • GET /tokens/native - Native XLM information

Migration Notes

Breaking Changes

  • Response Format: Changed from simple string array to detailed asset objects
  • Data Source: Now uses live blockchain data instead of mock data

Backward Compatibility

  • Search Parameter: Still accepts search query parameter
  • Endpoint Path: /tokens endpoint path remains the same

Conclusion

This integration successfully transforms the TradeFlow API from a static mockup into a real Web3 middleware server that fetches live data from the Stellar blockchain. The implementation is production-ready with proper error handling, caching, and comprehensive documentation.