RPC Nodes - ETH and Get ERC-20 balance

Modified on Tue, 14 Feb 2023 at 04:50 PM

It is possible to get the balance of an ERC-20 token via an RPC-Node call.

See example:

curl --location --request POST 'https://api.tatum.io/v3/blockchain/node/ETH/' \
--header 'x-api-key: ##Mainnet_API_KEY' \
--header 'Content-Type: application/json' \
--data-raw ' {
    "id":42,
    "jsonrpc":"2.0",
    "method":"eth_call",
    "params":[
        {
            //0x70a08231 is the "Keccak hash" for "balanceOf" &&  24 zeroes && ETH address holding the token (without 0x)
            "data":"0x70a0823100000000000000000000000069823872E61f8b8bB57E79CC28E09DC27B11a4Ab",
            "to":"0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2" // tokenAddress (ERC-20 ContractAddress)
        },
    "latest"
    ]
  }'

//Response: 

{
    "jsonrpc": "2.0",
    "id": 42,
    "result": "0x00000000000000000000000000000000000000000000000003fabd9b1157e000" // convert hex to decimal
}