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Metamask stopped using web3. Their own API has no methods for interacting with ERC20, ERC721 contracts. How do I accomplish simple task of reading token balance for a wallet on an ERC721 contract?

https://metamask.github.io/api-playground/api-documentation

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  • Metamask stopped using web3. This is not true. Aug 2 at 12:30

1 Answer 1

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Look at eth_call on Metamask API Docs.

Here is an example query for retrieving ERC20 balance:

{
"jsonrpc": "2.0",
"method": "eth_call",
"params": [
    {
        "data": "0x70a0823100000000000000000000000028c6c06298d514db089934071355e5743bf21d60",
        "to": "0xdac17f958d2ee523a2206206994597c13d831ec7"
    },
    "latest"
],
"id": 0
}

to is the contract address (in this case - USDT)

data consists of:

  1. the first 4 bytes of keccak256(balanceOf(address)) (function hash)
  2. the wallet address that you want to retrieve balance for (in this example - 0x28c6c06298d514db089934071355e5743bf21d60).

The same should work for NFTs since ERC721 balanceOf matches ERC20 specs.

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