Solana: `Error: destinationAmountSwapped is zero` Raydium CurveCalculator

Solana Curve Calculator misunderstanding: destinationAmountSwapped is null

The infamous “destinationAmountSwapped” error! This is a common problem when working with the Solana Curve Calculator and troubleshooting it can be frustrating. In this article, we’ll go into more detail about what this error means, how to identify it and – most importantly – how to fix it.

What is destinationAmountSwapped?

The “destinationAmountSwapped” error occurs when a swap request swaps a destination amount (i.e. the amount sent to the reserve is now the amount received). This can happen in several scenarios:

• Incorrect quote reserve: If the quote reserve of the amount entered is set to 0 and you try to send it to another reserve, Solana will change it back to the original destination.

• Swap error due to change of baseIn or quoteReserve: If either baseIn or quoteReserve was changed during a failed swap attempt, the error may occur.

Example of problem

Let’s look at an example using Raydium V2 SDK:

const swapResult = curve calculator.swap(
input amount,
baseIn? baseReserve: quoteReserve,
// some additional parameters...
);

Assuming baseReserve and quoteReserve are set to non-zero values, the error would occur because destinationAmountSwapped is set to 0:

{
"State": {
"Error": [
{
"Code": 1,
"Reason": "Target Amount Swapped"
}
]
},
"Data": {}
}

Troubleshooting steps

To resolve this issue, you can try the following:

• Check Quote Reserve: Make sure QuoteReserve is not set to 0.

• Check Swap Error Logs: Look for error messages related to failed swaps in your console or in the Raydium UI (if available).

• Check inputs and outputs: Double check that “inputAmount” is used correctly and that the swap parameters are configured correctly.

Example solution

To fix the problem, you can add a simple check before making the change:

const inputAmount = CurveCalculator.getBalance("Input", "from");
if (input amount === 0) {
throw new Error("Exchange reserve is not equal to zero.");
}
const baseIn = BaseReserve;
const quoteReserve = quoteReserve;
CurveCalculator.swap(
inputAmount,
baseIn? BaseReserve: QuoteReserve,
// some additional parameters...
);

By adding this check, you ensure that “destinationAmountSwapped” is not set to zero before the swap attempt.

I hope this explanation and example helps you fix the “Error: destinationAmountSwapped is null” issue when using Raydium V2 SDK with Solana Curve calculator!