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Mitigate rate limiting issues in FinalSettlementSubsidyHandler #1097

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Merged
ebma merged 1 commit into from
Mar 26, 2026
Merged

Mitigate rate limiting issues in FinalSettlementSubsidyHandler #1097

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23 changes: 16 additions & 7 deletions apps/api/src/api/services/phases/handlers/final-settlement-subsidy.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@ import {
} from "@vortexfi/shared";
import Big from "big.js";
import { encodeFunctionData, erc20Abi, TransactionReceipt } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { generatePrivateKey, privateKeyToAccount, privateKeyToAddress } from "viem/accounts";
import logger from "../../../../config/logger";
import { MAX_FINAL_SETTLEMENT_SUBSIDY_USD, MOONBEAM_FUNDING_PRIVATE_KEY } from "../../../../constants/constants";
import QuoteTicket from "../../../../models/quoteTicket.model";
Expand Down Expand Up @@ -81,15 +81,21 @@ export class FinalSettlementSubsidyHandler extends BasePhaseHandler {
switch (state.type) {
case RampDirection.BUY:
if (quote.inputCurrency === FiatToken.USD) {
expectedAmountRaw = Big(quote.metadata.alfredpayMint!.outputAmountRaw);
if (!quote.metadata.alfredpayMint) {
throw new Error("FinalSettlementSubsidyHandler: Missing AlfredPay mint metadata for USD onramp quote");
}
expectedAmountRaw = Big(quote.metadata.alfredpayMint.outputAmountRaw);
break;
}
expectedAmountRaw = multiplyByPowerOfTen(quote.outputAmount, outTokenDetails.decimals);
break;

case RampDirection.SELL:
if (quote.outputCurrency === FiatToken.USD) {
expectedAmountRaw = Big(quote.metadata.alfredpayOfframp!.inputAmountRaw);
if (!quote.metadata.alfredpayOfframp) {
throw new Error("FinalSettlementSubsidyHandler: Missing AlfredPay offramp metadata for USD sell quote");
}
expectedAmountRaw = Big(quote.metadata.alfredpayOfframp.inputAmountRaw);
break;
}
break;
Expand Down Expand Up @@ -146,7 +152,7 @@ export class FinalSettlementSubsidyHandler extends BasePhaseHandler {
}

logger.info(
`FinalSettlementSubsidyHandler: Subsidizing ${subsidyAmountRaw.toString()} units of ${isNative ? "native token" : outTokenDetails.assetSymbol} to ${ephemeralAddress}`
`FinalSettlementSubsidyHandler: Subsidizing ${subsidyAmountRaw.toString()} raw units of ${isNative ? "native token" : outTokenDetails.assetSymbol} to ${ephemeralAddress}`
);

// 4. Top up funding account if insufficient balance (ERC-20 only; native tokens are transferred directly)
Expand All @@ -164,17 +170,20 @@ export class FinalSettlementSubsidyHandler extends BasePhaseHandler {
const oneUsdInNativeRaw = multiplyByPowerOfTen(oneUsdInNative, nativeToken.decimals).toFixed(0);

const chainId = getNetworkId(destinationNetwork).toString();

// Use a placeholder address for this query to prevent rate limiting issues
const placeholderAddress = privateKeyToAddress(generatePrivateKey());
const testRouteResult = await getRoute({
bypassGuardrails: true,
enableExpress: true,
fromAddress: fundingAccount.address,
fromAddress: placeholderAddress,
fromAmount: oneUsdInNativeRaw,
fromChain: chainId,
fromToken: NATIVE_TOKEN_ADDRESS,
slippageConfig: {
autoMode: 1
},
toAddress: fundingAccount.address,
toAddress: placeholderAddress,
toChain: chainId,
toToken: outTokenDetails.erc20AddressSourceChain
});
Expand All @@ -187,7 +196,7 @@ export class FinalSettlementSubsidyHandler extends BasePhaseHandler {
`FinalSettlementSubsidyHandler: Swapping ${requiredNativeRaw} native units (approx. rate ${rate}) to get required subsidy.`
);

// Check the amount of native is not higher than cap, cap specidied in units of usd.
// Check the amount of native is not higher than cap, cap specified in units of usd.
const requiredNative = new Big(requiredNativeRaw).div(new Big(10).pow(nativeToken.decimals));
const requiredNativeInUsd = await priceFeedService.convertCurrency(
requiredNative.toString(),
Expand Down
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