balanceOf
view
Use this function in your app
const response = await fetch('https://api.thirdweb.com/v1/contracts/read', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'x-secret-key': '<YOUR_SECRET_KEY>'
  },
  body: JSON.stringify({
    calls: [
      {
        contractAddress: "0xf19F84e5622307E830b6E847619bC9f18295D6dd",
        method: "function balanceOf(address _owner, uint256 _id) view returns (uint256)",
        params: [_owner, _id]
      }
    ],
    chainId: 137
  })
});
const data = await response.json();