How to get SOL balance change to do PumpFun swaps in Solana
According to the latest Solana updates, it is not possible to directly get SOL (Solana) balance change using the getTransaction method. However, I can help you with how to achieve this.
Understanding the Transaction Response
Using the Solana API for transactions, such as “getTransaction”, returns a transaction object containing information about the last transaction. A transaction response typically includes multiple properties, including the current balance of various assets.
In your case, when you try to get SOL balance change using “getTransaction()”, you only get the pumpfun token balance. To achieve the desired result, you need to combine the transaction data with additional information to calculate the SOL balance change.
PumpFun Swap Structure
To do a pumpfun swap in Solana, you will need to make multiple transactions for each asset involved in the swap. Below is an example of how you can structure these transactions.
// Pumpfun Swap Transaction Structure
type PumpfunSwapTransaction = {
account0: string,
account1: string,
data: Uint8Array,
};
// Create a pumpfun swap
const pumpfunSwapTx = {
accounts: [
{ name: "pumpfun", type: "pubkey", pubkey: "0x...PUMPFUN_TOKEN_PUBKEY" },
{ name: "account1", type: "pubkey", pubkey: "0x...ACCOUNT1_PUBKEY" },
{name: "data", type: "bytes", data: Uint8Array.from(...),
// Additional accounts and data for the swap
},
],
};
// Create a transaction object with the pumpfun swap structure
const tx = {
account0: "pumpfun",
account1: "account1",
data: pumpfunSwapTx,
};
Calculating SOL Balance Changes
To calculate the SOL balance changes, multiple transactions must be performed for each asset involved in the swap. Here is an example of how to do this.
// Create a transaction object with multiple pumpfun swaps
const txs: PumpfunSwapTransaction[] = [];
for (let i = 0; i < 10; i++) {
const account1 = "account1" + String.fromCharCode(97 + i); // Generate account names for each asset
const data = Uint8Array.from([...], () => (i * 16).toString(16)); // Create a random byte array
const pumpfunSwapTx = {
accounts: [
{ name: "pumpfun", type: "pubkey", pubkey: 0x${account1} },
{ name: "data", type: "bytes", data: Uint8Array.from(..., ...), / Additional account and data / },
],
};
txs.push(pumpfunSwapTx);
}
// Create a transaction object with pumpfun swaps
const tx = {
account0: "pumpfun",
account1: "account1" + String.fromCharCode(97, 9),
data: pumpfunSwapTx,
};
// Submit a transaction (solo transaction submission)
submitTransaction(tx);
Note:
The above example assumes a simple pumpfun swap scenario. In reality, you will need to process multiple asset swaps and additional accounts.
The “getTransaction” method does not provide direct access to the SOL balance change. However, by performing multiple transactions for each asset involved in the swap, you can calculate the desired SOL balance change.
Additional Tips:
- Be sure to check the Solana API documentation for the latest information on submitting and executing trades.
- Consider using a tool like “solscan” or “solhint” to help identify potential issues with your trades.
- Always handle errors and exceptions properly when working with the Solana API.
