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Exchange Rate
Each qToken is convertible into an ever increasing quantity of the underlying asset, as interest accrues in the market. The exchange rate between a qToken and the underlying asset is equal to:
exchangeRate = (getCash() + totalBorrow() - totalReserve()) / totalSupply()

QToken

function exchangeRate() external view returns (uint);
  • RETURN: The current exchange rate as an unsigned integer, scaled by 1 * 10^18.

Solidity

QToken qToken = QToken(<qTokenAddress>);
uint rate = qToken.exchangeRate();

Ethers.js

const qToken = await ethers.getContractAt(<qTokenABI>, <qTokenAddress>);
const rate = await qToken.exchangeRate();
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QToken
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Ethers.js