💰 Galaxy DeFi Protocols

Integration layer for Stellar DeFi protocols

📋 Overview

@galaxy/core-defi-protocols provides a unified interface for interacting with DeFi protocols on the Stellar blockchain. It abstracts protocol-specific implementations behind a common interface, making it easy to integrate multiple protocols with consistent patterns.

Supported Protocols

• Blend Protocol - Lending and borrowing
• Soroswap - Decentralized exchange
• Aquarius - Liquidity pools

🎯 Features

• ✅ Unified Interface - Common interface (IDefiProtocol) for all protocols
• ✅ Type Safety - Full TypeScript support with comprehensive types
• ✅ Factory Pattern - Easy protocol instantiation with factory service
• ✅ Validation - Built-in input validation for addresses, amounts, and assets
• ✅ Error Handling - Consistent error handling across all protocols
• ✅ Extensible - Easy to add new protocol implementations
• ✅ Security - Never stores private keys, validates all inputs
• ✅ Testing - 90%+ test coverage

📦 Installation

npm install @galaxy/core-defi-protocols

🚀 Quick Start

Basic Usage

import {
  getProtocolFactory,
  ProtocolConfig,
  TESTNET_CONFIG
} from '@galaxy/core-defi-protocols';

// 1. Create protocol configuration
const config: ProtocolConfig = {
  protocolId: 'blend',
  name: 'Blend Protocol',
  network: TESTNET_CONFIG,
  contractAddresses: {
    pool: 'CBLEND_POOL_CONTRACT_ADDRESS'
  },
  metadata: {}
};

// 2. Get protocol instance from factory
const factory = getProtocolFactory();
const blend = factory.createProtocol(config);

// 3. Initialize protocol
await blend.initialize();

// 4. Supply assets to earn interest
const result = await blend.supply(
  'GBRPYHIL2CI3FNQ4BXLFMNDLFJUNPU2HY3ZMFSHONUCEOASW7QC7OX2H',
  'SXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX',
  {
    code: 'USDC',
    issuer: 'GAUSDC_ISSUER_ADDRESS',
    type: 'credit_alphanum4'
  },
  '1000.00'
);

console.log('Transaction hash:', result.hash);

// 5. Check position health
const position = await blend.getPosition(walletAddress);
console.log('Health Factor:', position.healthFactor);
console.log('Collateral Value:', position.collateralValue);
console.log('Debt Value:', position.debtValue);

📚 Core Concepts

IDefiProtocol Interface

All protocols implement the IDefiProtocol interface, which defines:

• Lending Operations: supply(), borrow(), repay(), withdraw()
• Position Management: getPosition(), getHealthFactor()
• Protocol Info: getSupplyAPY(), getBorrowAPY(), getStats()
• DEX Operations (optional): swap(), addLiquidity(), removeLiquidity()

BaseProtocol Abstract Class

The BaseProtocol abstract class provides common functionality:

• Network connection management
• Input validation (addresses, amounts, assets)
• Configuration validation
• Error handling utilities
• Transaction result building

Protocol Factory

The ProtocolFactory uses the singleton pattern to manage protocol registration and instantiation:

import { ProtocolFactory } from '@galaxy/core-defi-protocols';

const factory = ProtocolFactory.getInstance();

// Register a custom protocol
factory.register('my-protocol', MyProtocolClass);

// Create protocol instance
const protocol = factory.createProtocol(config);

🔧 API Reference

Types

Asset

interface Asset {
  code: string;                                    // e.g., 'USDC', 'XLM'
  issuer?: string;                                 // Required for non-native assets
  type: 'native' | 'credit_alphanum4' | 'credit_alphanum12';
}

Position

interface Position {
  address: string;
  supplied: PositionBalance[];                     // Supplied assets
  borrowed: PositionBalance[];                     // Borrowed assets
  healthFactor: string;                            // >1.0 is healthy
  collateralValue: string;                         // Total collateral in USD
  debtValue: string;                               // Total debt in USD
}

TransactionResult

interface TransactionResult {
  hash: string;                                    // Transaction hash
  status: 'success' | 'failed' | 'pending';
  ledger: number;                                  // Ledger number
  createdAt: Date;
  metadata: Record<string, unknown>;
}

Operation Types (Discriminated Unions)

import {
  OperationType,
  SupplyOperation,
  SwapOperation,
  isSupplyOperation,
  isSwapOperation
} from '@galaxy/core-defi-protocols';

// All operation types: SupplyOperation, WithdrawOperation, BorrowOperation,
// RepayOperation, SwapOperation, AddLiquidityOperation, RemoveLiquidityOperation

const supplyOp: SupplyOperation = {
  type: OperationType.SUPPLY,
  timestamp: new Date(),
  walletAddress: 'GBRPY...OX2H',
  asset: { code: 'USDC', issuer: 'GAUS...', type: 'credit_alphanum4' },
  amount: '1000.0000000'
};

// Use type guards to narrow types
if (isSupplyOperation(op)) {
  console.log(`Supplying ${op.amount} of ${op.asset.code}`);
}

Error Classes

import {
  ProtocolError,
  InsufficientBalanceError,
  SlippageExceededError,
  isProtocolError,
  wrapError
} from '@galaxy/core-defi-protocols';

// Available error classes:
// - ProtocolError (base) - ProtocolInitError - InsufficientBalanceError
// - InvalidOperationError - ContractError - SlippageExceededError - HealthFactorError

try {
  await protocol.supply(wallet, privateKey, asset, amount);
} catch (error) {
  if (isProtocolError(error)) {
    console.error(`[${error.code}] ${error.message}`);
    if (error instanceof InsufficientBalanceError) {
      console.log(`Need ${error.required}, have ${error.available}`);
    }
  } else {
    const wrapped = wrapError(error, 'blend');
    console.error(wrapped.toJSON());
  }
}

Main Methods

initialize()

Initialize protocol connection and validate configuration.

await protocol.initialize();

supply(walletAddress, privateKey, asset, amount)

Supply assets to the protocol to earn interest.

const result = await protocol.supply(
  'GBRPY...OX2H',
  'SXXXX...XXXX',
  { code: 'USDC', issuer: 'GAUS...', type: 'credit_alphanum4' },
  '1000.00'
);

borrow(walletAddress, privateKey, asset, amount)

Borrow assets from the protocol against supplied collateral.

const result = await protocol.borrow(
  'GBRPY...OX2H',
  'SXXXX...XXXX',
  { code: 'XLM', type: 'native' },
  '500.00'
);

getPosition(address)

Get user's current position in the protocol.

const position = await protocol.getPosition('GBRPY...OX2H');
console.log('Health Factor:', position.healthFactor);

getHealthFactor(address)

Get detailed health factor information for a position.

const health = await protocol.getHealthFactor('GBRPY...OX2H');
console.log('Is Healthy:', health.isHealthy);
console.log('Liquidation Threshold:', health.liquidationThreshold);

🔄 Soroswap Protocol (DEX)

Soroswap is a Uniswap V2-style decentralized exchange on Stellar. It supports token swaps and liquidity pool management.

Quick Start

import {
  SoroswapProtocol,
  SOROSWAP_TESTNET_CONFIG,
  getSoroswapConfig
} from '@galaxy/core-defi-protocols';

// Initialize Soroswap
const soroswap = new SoroswapProtocol(SOROSWAP_TESTNET_CONFIG);
await soroswap.initialize();

// Get protocol stats
const stats = await soroswap.getStats();
console.log('TVL:', stats.tvl);

// Get pair information
const pairInfo = await soroswap.getPairInfo(tokenAAddress, tokenBAddress);
console.log('Reserves:', pairInfo.reserve0, pairInfo.reserve1);

// Get all registered pairs
const pairs = await soroswap.getAllPairs();

Factory Usage

import { getProtocolFactory, SOROSWAP_TESTNET_CONFIG } from '@galaxy/core-defi-protocols';

// Soroswap auto-registers with the factory on import
const factory = getProtocolFactory();
const soroswap = factory.createProtocol(SOROSWAP_TESTNET_CONFIG);
await soroswap.initialize();

DEX Operations (Coming Soon)

The following operations are stubbed and will be implemented in upcoming issues:

• swap() — Token swaps via the router contract (#27)
• getSwapQuote() — Get swap quotes with price impact (#28)
• addLiquidity() — Add liquidity to pools (#29)
• removeLiquidity() — Remove liquidity from pools (#30)
• getLiquidityPool() — Get pool information (#29)

Contract Addresses

| Network | Router | Factory | |---------|--------|---------| | Testnet | CCJUD55AG...ZE7BRD | CDP3HMUH6...RJTBY | | Mainnet | CAG5LRYQ5...AJDDH | CA4HEQTL2...7AW2 |

🛠️ Development

Adding a New Protocol

1. Create Protocol Class

// src/protocols/my-protocol/my-protocol.ts
import { BaseProtocol } from '../base-protocol';
import { ProtocolType } from '../../types/defi-types';

export class MyProtocol extends BaseProtocol {
  protected getProtocolType(): ProtocolType {
    return ProtocolType.LENDING;
  }

  protected async setupProtocol(): Promise<void> {
    // Initialize protocol-specific connections
  }

  // Implement required abstract methods
  public async supply(...) { /* ... */ }
  public async borrow(...) { /* ... */ }
  // ... other methods
}

2. Register Protocol

import { getProtocolFactory } from '@galaxy/core-defi-protocols';
import { MyProtocol } from './protocols/my-protocol/my-protocol';

const factory = getProtocolFactory();
factory.register('my-protocol', MyProtocol);

3. Write Tests

// __tests__/protocols/my-protocol.test.ts
describe('MyProtocol', () => {
  it('should supply assets', async () => {
    const protocol = new MyProtocol(config);
    await protocol.initialize();
    const result = await protocol.supply(...);
    expect(result.status).toBe('success');
  });
});

Running Tests

# Run all tests
npm test

# Run tests in watch mode
npm run test:watch

# Run tests with coverage
npm run test:coverage

Building

# Build the package
npm run build

# Build in watch mode (for development)
npm run dev

🔒 Security

Best Practices

1. Never Store Private Keys - Private keys are only used to sign transactions and are never stored
2. Validate All Inputs - Use built-in validation utilities for addresses, amounts, and assets
3. Check Health Factors - Always check position health before risky operations
4. Use Slippage Protection - Set appropriate slippage tolerance for swaps
5. Test on Testnet First - Always test your integration on testnet before mainnet

Input Validation

import {
  validateAddress,
  validateAmount,
  validateAsset,
  validateSlippage
} from '@galaxy/core-defi-protocols';

// Validate Stellar address
validateAddress('GBRPY...OX2H');

// Validate amount
validateAmount('1000.50', 'Deposit Amount');

// Validate asset
validateAsset({
  code: 'USDC',
  issuer: 'GAUS...XXXX',
  type: 'credit_alphanum4'
});

// Validate slippage (0-1, e.g., 0.01 for 1%)
validateSlippage('0.01');

🧪 Testing

The package includes comprehensive tests with 90%+ coverage:

• Unit Tests - All utilities and services
• Integration Tests - Protocol implementations
• Validation Tests - Input validation

npm test                 # Run all tests
npm run test:coverage    # Generate coverage report

📖 Examples

See the docs/examples/defi-protocols/ directory for complete examples:

• 01-basic-setup.ts - Basic protocol setup and initialization
• 02-lending-operations.ts - Supply, borrow, repay, withdraw
• 03-custom-protocol.ts - Implementing a custom protocol
• 04-operations.ts - Using different operation types and error handling

🤝 Contributing

1. Follow the project's TypeScript style guide
2. Write comprehensive tests (aim for 90%+ coverage)
3. Update documentation for new features
4. Add examples for new protocols

📄 License

MIT © Galaxy DevKit Team

🔗 Links

• Galaxy DevKit Documentation
• Stellar Documentation
• Soroban Documentation
• Blend Protocol
• Soroswap

Built with ❤️ for the Stellar ecosystem