Google App Script to get Anchor Protocol Earn balance for a terra wallet address.

getAnchorBalance.js

function getAnchorBalance(addr) {
  const contract = 'terra1hzh9vpxhsk8253se0vv5jj6etdvxu3nv8z07zu';
  const aUstBalance = JSON.parse(JSON.parse(UrlFetchApp.fetch("https://mantle.terra.dev/?cw20--balance=" + contract, {
    method: 'post',
    headers: { 'Accept-Encoding': 'gzip, deflate, br', 'Content-Type': 'application/json', 'Accept': 'application/json' },
    payload: JSON.stringify({
      operationName: null,
      variables: {},
      query: `{\n  ${contract}: WasmContractsContractAddressStore(ContractAddress: \"${contract}\", QueryMsg: \"{\\\"balance\\\":{\\\"address\\\":\\\"${addr}\\\"}}\") {\n    Height\n    Result\n    __typename\n  }\n}\n`
    })
  }).getContentText()).data[contract].Result).balance;
  const rate = JSON.parse(UrlFetchApp.fetch('https://api.anchorprotocol.com/api/v1/market/ust').getContentText()).exchange_rate;
  return aUstBalance * rate / 1000000;
}