checkSupplyRate.js

const Web3 = require('web3');
const web3 = new Web3(`https://mainnet.infura.io/v3/${process.env.infuraApiKey}`);

const cUsdtAddress = '0xf650c3d88d12db855b8bf7d11be6c55a4e07dcc9';
const cUsdtAddressAbi = [{"inputs":[{"internalType":"address","name":"underlying_","type":"address"},{"internalType":"contract ComptrollerInterface","name":"comptroller_","type":"address"},{"internalType":"contract InterestRateModel","name":"interestRateModel_","type":"address"},{"internalType":"uint256","name":"initialExchangeRateMantissa_","type":"uint256"},{"internalType":"string","name":"name_","type":"string"},{"internalType":"string","name":"symbol_","type":"string"},{"internalType":"uint8","name":"decimals_","type":"uint8"},{"internalType":"address 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const cUsdcAddress = '0x39aa39c021dfbae8fac545936693ac917d5e7563';
const cUsdcAddressAbi = 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const main = async function() {
  let cToken = new web3.eth.Contract(cUsdtAddressAbi, cUsdtAddress);
  let supplyRatePerBlock = await cToken.methods.supplyRatePerBlock().call();

  console.log('USDT srpb', supplyRatePerBlock);

  cToken = new web3.eth.Contract(cUsdcAddressAbi, cUsdcAddress);
  supplyRatePerBlock = await cToken.methods.supplyRatePerBlock().call();

  console.log('USDC srpb', supplyRatePerBlock);
}

main().catch((err) => {
  console.error(err);
});

output:

USDT srpb 9784454209
USDC srpb 7774806063