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wphan/calcInterestRate.ts

Created August 26, 2025 17:16
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drift earn deposit/borrow interest APR->APY example
Raw
calcInterestRate.ts
import {
convertToNumber,
calculateBorrowRate,
calculateDepositRate,
PERCENTAGE_PRECISION,
} from '@drift-labs/sdk';
const { driftClient } = await initDriftClients(process.env.RPC_URL!);
const getApyFromApr = (
aprPercent: number,
compoundingFrequency: 'hourly' | 'daily'
): number => {
const n = compoundingFrequency === 'hourly' ? 24 * 365 : 365;
const aprDecimal = aprPercent / 100;
return ((1 + aprDecimal / n) ** n - 1);
};
const mkt = driftClient.getSpotMarketAccount(0)!;
const depositRateApr = convertToNumber(calculateDepositRate(mkt), PERCENTAGE_PRECISION) * 100.0;
const borrowRateApr = convertToNumber(calculateBorrowRate(mkt), PERCENTAGE_PRECISION) * 100.0;
const depositRateApy = getApyFromApr(depositRateApr, 'daily') * 100.0;
const borrowRateApy = getApyFromApr(borrowRateApr, 'daily') * 100.0;
console.log(`Deposit rate: ${depositRateApr.toFixed(6)}% APR, ${depositRateApy.toFixed(6)}% APY`);
console.log(`Borrow rate: ${borrowRateApr.toFixed(6)}% APR, ${borrowRateApy.toFixed(6)}% APY`);
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