Automating Pump.fun Trading with Metis and Solana Web3.js 2.0

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This guide demonstrates how to integrate with Pump.fun's API using Solana Web3.js 2.0 and Metis to automate token trading. Learn to fetch quotes, execute swaps, and manage transactions programmatically through a detailed TypeScript implementation.

Key Features

Prerequisites

Implementation Steps

1. Project Setup

npm init -y
npm install @solana/web3.js@2 dotenv
npm install --save-dev typescript ts-node @types/node

2. Core Functionality

API Configuration

const createPumpFunTransport = (metisEndpoint: string): RpcTransport => {
  return async <TResponse>(...args) => {
    const { method, params } = args[0].payload;
    const url = new URL(`${metisEndpoint}/${METHOD_MAP[method].path}`);
    
    return METHOD_MAP[method].method === 'GET' 
      ? handleGET<TResponse>(url, params)
      : handlePOST<TResponse>(url, params);
  };
};

Transaction Handling

async function signAndSendTransaction(
  txBase64: string,
  signerKey: number[]
): Promise<string> {
  const keypair = await createKeyPairFromBytes(new Uint8Array(signerKey));
  const txBytes = getBase64Encoder().encode(txBase64);
  const signedTx = await signTransaction([keypair], getTransactionDecoder().decode(txBytes));
  
  const { lastValidBlockHeight, blockhash } = await rpc.getLatestBlockhash().send();
  const txWithLifetime = { ...signedTx, lifetimeConstraint: { blockhash, lastValidBlockHeight } };
  
  return sendAndConfirmTransactionFactory({ rpc, rpcSubscriptions })(txWithLifetime);
}

3. Trading Workflow

Fetching Quotes

const quote = await pumpFunApi.pumpfun_quote({
  type: 'BUY',
  mint: targetAddress,
  amount: 1_000_000 // 0.001 SOL
}).send();

Executing Swaps

const swap = await pumpFunApi.pumpfun_swap({
  wallet: signerAddress,
  type: 'BUY',
  mint: targetAddress,
  inAmount: 1_000_000,
  priorityFeeLevel: 'high'
}).send();

const txSignature = await signAndSendTransaction(swap.tx, walletSecret);

Best Practices

  1. Error Handling: Implement robust try-catch blocks for API calls
  2. Rate Limiting: Respect API rate limits (3-5 requests/second)
  3. Security: Never expose private keys in client-side code
  4. Testing: Always test with small amounts first

👉 Explore more Solana trading strategies

FAQ

What is Pump.fun?

A permissionless token creation and trading platform on Solana using fair launch principles.

Why use Web3.js 2.0?

The new version offers improved type safety, modular architecture, and better performance.

Can I use this on mainnet?

Yes, but start with small test transactions and ensure proper error handling.

How do I get a Metis API key?

Sign up at QuickNode and enable the Metis add-on.

👉 Learn advanced Solana trading techniques

Conclusion

This implementation provides a foundation for building sophisticated trading tools on Pump.fun. Key takeaways:

  1. Web3.js 2.0 offers significant improvements for Solana development
  2. Metis API simplifies integration with DeFi protocols
  3. Proper architecture ensures maintainability and scalability

For production deployment:

Additional Resources