Trace methods

Infura provides access to the following trace API methods to allow users to gain insights into the execution of smart contracts and transactions:

info

Trace API is currently an open beta feature, available to paying Infura customers.
trace_block and trace_transaction returns trace diagnostic information.

`trace`

Provides an ordered trace of the instructions executed by the Ethereum Virtual Machine (EVM) during the execution of a smart contract transaction. Excludes precompiled contracts.

Trace example
"trace":[
  {
    "action":{
      "callType":"call",
      "from":"0xfe3b557e8fb62b89f4916b721be55ceb828dbd73",
      "gas":"0xffadea",
      "input":"0x",
      "to":"0x0100000000000000000000000000000000000000",
      "value":"0x0"
    },
    "result":{
      "gasUsed":"0x1e",
      "output":"0x"
    },
    "subtraces":0,
    "traceAddress":[
    ],
    "type":"call"
  }
]

Key	Value
`action`	Transaction details.
`callType`	Whether the transaction is `call` or `create`.
`from`	Address of the transaction sender.
`gas`	Gas provided by sender.
`input`	Transaction data.
`to`	Target of the transaction.
`value`	Value transferred in the transaction.
`result`	Transaction result.
`gasUsed`	Gas used by the transaction. Includes any refunds of unused gas.
`output`	Return value of the contract call. Contains only the actual value sent by a `RETURN` operation. If a `RETURN` was not executed, the output is empty bytes.
`subTraces`	Traces of contract calls made by the transaction.
`traceAddress`	Tree list address of where the call occurred, address of the parents, and order of the current sub call.
`transactionHash`	Hash of the transaction.
`transactionPosition`	Transaction position.
`type`	Whether the transaction is a `CALL` or `CREATE` series operation.

Trace methods

trace​

`trace`