Get COMP accrued for an account on mainnet using Compound.js (https://github.com/compound-finance/compound-js)

getCompAccrued.js

const Compound = require('@compound-finance/compound-js');

const provider = 'https://mainnet.infura.io/v3/' + process.env.infuraApiKey;

// mainnet
const CompoundLens = Compound.util.getAddress(Compound.CompoundLens);
const LensAbi = Compound.util.getAbi(Compound.CompoundLens);
const COMP = Compound.util.getAddress(Compound.COMP);
const Comptroller = Compound.util.getAddress(Compound.Comptroller);
const me = '0xa0df350d2637096571F7A701CBc1C5fdE30dF76A';

(async function() {

  let metadata = await Compound.eth.read(
    CompoundLens,
    'getCompBalanceMetadataExt',
    [ COMP, Comptroller, me ],
    { provider, abi: LensAbi }
  );

  console.log('allocated', +metadata.allocated.toString() / 1e18);

})().catch(console.error);