getTokenAccountsByOwner

curl --request POST \
  --url https://mainnet.helius-rpc.com/ \
  --header 'Content-Type: application/json' \
  --data '{
  "jsonrpc": "2.0",
  "id": "1",
  "method": "getTokenAccountsByOwner",
  "params": [
    "A1TMhSGzQxMr1TboBKtgixKz1sS6REASMxPo1qsyTSJd",
    {
      "programId": "TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"
    },
    {
      "encoding": "jsonParsed"
    }
  ]
}'

{
  "jsonrpc": "2.0",
  "id": "1",
  "result": {
    "context": {
      "apiVersion": "2.0.15",
      "slot": 341197933
    },
    "value": [
      {
        "pubkey": "BGocb4GEpbTFm8UFV2VsDSaBXHELPfAXrvd4vtt8QWrA",
        "account": {
          "lamports": 2039280,
          "owner": "TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA",
          "data": {
            "program": "spl-token",
            "parsed": {
              "info": {
                "isNative": false,
                "mint": "2cHr7QS3xfuSV8wdxo3ztuF4xbiarF6Nrgx3qpx3HzXR",
                "owner": "A1TMhSGzQxMr1TboBKtgixKz1sS6REASMxPo1qsyTSJd",
                "state": "initialized",
                "tokenAmount": {
                  "amount": "420000000000000",
                  "decimals": 6,
                  "uiAmount": 420000000,
                  "uiAmountString": "420000000"
                }
              }
            },
            "space": 165
          },
          "executable": false,
          "rentEpoch": 18446744073709552000,
          "space": 165
        }
      }
    ]
  }
}