trace_transaction

Provides transaction processing of type trace for the specified transaction. Use this API to improve smart contract performance by analyzing its internal transactions and execution steps. You can use this information to identify bottlenecks and optimize the contract for better performance. This method uses 300 credits from your daily balance.

Parameters

• transaction hash: [Required] The transaction hash.

Returns

• A list of traces in the order called by the transaction.

Example

Replace <YOUR-API-KEY> with an API key from your MetaMask Developer dashboard.

Request

• curl
• WSS

curl https://mainnet.infura.io/v3/<YOUR-API-KEY> \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc": "2.0", "method": "trace_transaction","params": ["0x4c253746668dca6ac3f7b9bc18248b558a95b5fc881d140872c2dff984d344a7"],"id": 1}'

wscat -c wss://mainnet.infura.io/ws/v3/<YOUR-API-KEY> -x '{"jsonrpc": "2.0", "method": "trace_transaction", "params": ["0x4c253746668dca6ac3f7b9bc18248b558a95b5fc881d140872c2dff984d344a7"], "id": 1}'

Response

• JSON

{
  "jsonrpc": "2.0",
  "result": [
    {
      "action": {
        "callType": "call",
        "from": "0xfe3b557e8fb62b89f4916b721be55ceb828dbd73",
        "gas": "0xffad82",
        "input": "0x0000000000000000000000000000000000000999",
        "to": "0x0020000000000000000000000000000000000000",
        "value": "0x0"
      },
      "blockHash": "0x71512d31e18f828cef069a87bc2c7514a8ca334f9ee72625efdf5cc2d43768dd",
      "blockNumber": 6,
      "result": {
        "gasUsed": "0x7536",
        "output": "0x"
      },
      "subtraces": 1,
      "traceAddress": [],
      "transactionHash": "0x91eeabc671e2dd2b1c8ddebb46ba59e8cb3e7d189f80bcc868a9787728c6e59e",
      "transactionPosition": 0,
      "type": "call"
    }
  ]
}