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fix: usdt0 approval amount #612

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Merged
liu-zhipeng merged 1 commit into from
Mar 27, 2026
Merged

fix: usdt0 approval amount #612

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8 changes: 6 additions & 2 deletions packages/adapters/rebalance/src/adapters/usdt0/usdt0.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -165,7 +165,10 @@ export class Usdt0BridgeAdapter implements BridgeAdapter {
spender: USDT0_LEGACY_MESH_ETH,
});

if (allowance < BigInt(amount)) {
// Approve amount + 5% buffer to cover any on-chain fees the OFT contract charges on top
const approvalAmount = BigInt(amount) + (BigInt(amount) * 5n) / 100n;

if (allowance < approvalAmount) {
// Mainnet USDT requires setting allowance to 0 before setting a new non-zero value
if (
route.origin === Number(MAINNET_CHAIN_ID) &&
Expand Down Expand Up @@ -198,7 +201,7 @@ export class Usdt0BridgeAdapter implements BridgeAdapter {
data: encodeFunctionData({
abi: erc20Abi,
functionName: 'approve',
args: [USDT0_LEGACY_MESH_ETH, BigInt(amount)],
args: [USDT0_LEGACY_MESH_ETH, approvalAmount],
}),
value: BigInt(0),
funcSig: 'approve(address,uint256)',
Expand All @@ -207,6 +210,7 @@ export class Usdt0BridgeAdapter implements BridgeAdapter {

this.logger.debug('USDT0 approval transaction(s) added', {
...logContext,
approvalAmount: approvalAmount.toString(),
approvalCount: transactions.length,
});
}
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