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sdk: fix exactOut swaps #2031

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Merged
merged 2 commits into from
Nov 18, 2025
Merged

sdk: fix exactOut swaps #2031

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a0dd2f2
fix exactOut swaps
lowkeynicc Nov 18, 2025
0f2c911
rm comment
lowkeynicc Nov 18, 2025
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16 changes: 14 additions & 2 deletions sdk/src/driftClient.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -6321,7 +6321,6 @@ export class DriftClient {
const inMarket = this.getSpotMarketAccount(inMarketIndex);

const isExactOut = swapMode === 'ExactOut';
const exactOutBufferedAmountIn = amount.muln(1001).divn(1000); // Add 10bp buffer

const preInstructions: TransactionInstruction[] = [];

Expand Down Expand Up @@ -6377,11 +6376,24 @@ export class DriftClient {
}
}

let amountInForBeginSwap: BN;
if (isExactOut) {
if (quote || v6?.quote) {
amountInForBeginSwap = v6?.quote
? new BN(v6.quote.inAmount)
: new BN(quote!.inAmount);
} else {
amountInForBeginSwap = amount.muln(1001).divn(1000);
}
} else {
amountInForBeginSwap = amount;
}

// Get drift swap instructions for begin and end
const { beginSwapIx, endSwapIx } = await this.getSwapIx({
outMarketIndex,
inMarketIndex,
amountIn: isExactOut ? exactOutBufferedAmountIn : amount,
amountIn: amountInForBeginSwap,
inTokenAccount: finalInAssociatedTokenAccount,
outTokenAccount: finalOutAssociatedTokenAccount,
reduceOnly,
Expand Down
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