# Agent 2: DEX Trading Engine
You are Claude Opus 4.5 building the trading engine for a DeFi MCP server. Create `/packages/trading-engine/`.
## Context
- Depends on `@defi-mcp/solana-core` for transactions
- Real swaps on Solana mainnet, NO MOCKS
- Unlimited API credits available
## Build These Components
### 1. Jupiter Integration (`src/jupiter/`)
```typescript
interface JupiterClient {
getQuote(input: string, output: string, amount: bigint, slippageBps?: number): Promise<Quote>;
getSwapTransaction(quote: Quote, userPublicKey: string): Promise<VersionedTransaction>;
executeSwap(quote: Quote, signer: Keypair): Promise<TransactionResult>;
}
```
- Jupiter V6 API: `https://quote-api.jup.ag/v6`
- Route optimization, fee estimation
- DCA and Limit orders
### 2. Raydium Integration (`src/raydium/`)
```typescript
interface RaydiumClient {
getPoolInfo(poolId: string): Promise<PoolInfo>;
getPoolsByToken(mint: string): Promise<PoolInfo[]>;
swap(params: SwapParams): Promise<TransactionResult>;
addLiquidity(params: LiquidityParams): Promise<TransactionResult>;
}
```
- AMM V4 + CLMM pools
- Direct pool interaction for speed
- SDK: `@raydium-io/raydium-sdk-v2`
### 3. PumpFun Integration (`src/pumpfun/`)
```typescript
interface PumpFunClient {
getBondingCurve(mint: string): Promise<BondingCurveState>;
buy(mint: string, solAmount: bigint, slippageBps: number): Promise<TransactionResult>;
sell(mint: string, tokenAmount: bigint, slippageBps: number): Promise<TransactionResult>;
subscribeToNewTokens(cb: (token: NewToken) => void): void;
detectMigration(mint: string): Promise<MigrationStatus>;
}
```
- Bonding curve math
- Migration detection to Raydium
- Real-time new token monitoring
### 4. Trade Executor (`src/executor/`)
```typescript
interface TradeExecutor {
executeTrade(params: TradeParams): Promise<TradeResult>;
executeBatch(trades: TradeParams[]): Promise<TradeResult[]>;
getOptimalRoute(input: string, output: string, amount: bigint): Promise<Route>;
}
```
- Smart routing (Jupiter vs direct)
- MEV protection via Jito
- Batch execution
## Dependencies
```json
{
"@raydium-io/raydium-sdk-v2": "^0.1.0",
"@orca-so/whirlpools-sdk": "^0.13.0"
}
```
## APIs
- Jupiter: `https://quote-api.jup.ag/v6`
- PumpFun: `https://frontend-api.pump.fun` + on-chain
- Token list: `https://token.jup.ag/all`
## Key Requirements
1. All swaps execute on REAL mainnet
2. Default slippage: 100 bps (1%)
3. MEV protection option via Jito bundles
4. Handle insufficient liquidity gracefully
5. Rate limit: 600 req/min to Jupiter
START BUILDING NOW - Complete code only.
