How do I retrieve the "COMP earned" value from the Compound protocol? Get the amount of accrued COMP token for an address using the Ethereum blockchain.

comp_earned.md

How do I retrieve the "COMP earned" value?

With a Smart Contract or JSON RPC

Get the value of COMP earned for an address that uses the Compound protocol. This can be done using the Lens contract with JSON RPC or another Smart Contract. If you do an eth_call with JSON RPC, it is free (no gas costs).

1. Use the getCompBalanceMetadataExt method in the Lens contract https://etherscan.io/address/0xdCbDb7306c6Ff46f77B349188dC18cEd9DF30299#code
2. Lens address is posted here https://github.com/compound-finance/compound-protocol/blob/master/networks/mainnet.json#L31
3. Here is the definition https://github.com/compound-finance/compound-protocol/blob/master/contracts/Lens/CompoundLens.sol#L453
4. pass: COMP contract address, Comptroller contract address, and the address you want to know the amount of COMP earned

Tools

Alternatively there is a cool tool from KZen networks that does the same thing. https://github.com/KZen-networks/compound-playground#comp

KZen also created the COMP checker page: https://kzen-networks.github.io/comp-checker/

👍

//check unclaimed comp and claimed comp in ropsten network

const hre = require("hardhat");
async function main() {
const CompAddress = "0xf76D4a441E4ba86A923ce32B89AFF89dBccAA075";
const CompAbi = require("../abi/Comp.json");
const Comp = new hre.ethers.Contract(
CompAddress,
CompAbi,
ethers.provider.getSigner()
);
const CompoundLensAddress = "0xA9ddAb1032F224B510f7Bf002E0E75BA49E78755";
const CompoundLensAbi = require("../abi/CompoundLens.json");
const CompoundLens = new hre.ethers.Contract(
CompoundLensAddress,
CompoundLensAbi,
ethers.provider.getSigner()
);
console.log("Comp balance",Comp.address);
console.log("Comp balance of the address is ",await Comp.balanceOf("address_to_check"));
console.log("Comp balance from lens",await CompoundLens.connect(ethers.provider.getSigner()).callStatic.getCompBalanceMetadataExt("0xf76D4a441E4ba86A923ce32B89AFF89dBccAA075","0xcfa7b0e37f5AC60f3ae25226F5e39ec59AD26152",address_to_check))
}
// We recommend this pattern to be able to use async/await everywhere
// and properly handle errors.
main().catch((error) => {
console.error(error);
process.exitCode = 1;
});