Polygon API Documentation

debug_traceTransaction RPC Method

debug_traceTransaction returns the number of possible tracing result by executing an eth_call within the context of the given block execution.

Parameters

• Transaction hash [required]

• Tracer object [optional]

  • The type of tracer - It might be callTracer or prestateTracer

    • callTracer - The calltracer keeps track of all call frames, including depth 0 calls, that are made during a transaction.

    • prestateTracer - The prestateTracer replays the transaction and tracks every part of state that occured during the transaction.

  • tracerConfig - The object to specify the configurations of the tracer

    • onlyTopCall - When set to true, this will only trace the primary (top-level) call and not any sub-calls. It eliminates the additional processing for each call frame.

Additional configuration parameters

• disableStorage — when enabled, it prevents tracing of storage changes made by the transaction being analyzed, which can reduce the resource requirements of the analysis. By default, debug_traceTransaction traces both memory and storage changes, but storage tracing can be particularly resource-intensive, especially for large transactions.

• disableStack — when enabled, it skips tracing of stack changes made by the transaction being analyzed.

• disableMemory — when true, it stops tracing of memory changes made by the transaction being analyzed, reducing resource requirements.

• disableReturnData — when true, it prevents the method from tracing the return data of a transaction. This return data tracing can be very demanding on resources, as it requires a lot of time and processing power.

• timeout (default: 5s) — allows to customize the method's timeout period for JavaScript-based tracing calls.

When using one of the three tracers, the disableMemory, disableStorage, disableStack, and disableReturnData will not have any effect.

When no tracer is selected, the response defaults to the Struct/opcode logger (opens in a new tab).

Returns

callTracer response

prestateTracer response

• smart contract address — The address of the smart contract associated with the result.

  • balance — The balance of the contract, expressed in wei and encoded as a hexadecimal string.

  • code — The bytecode of the contract, encoded as a hexadecimal string.

  • nonce — The nonce of the account associated with the contract, represented as an unsigned integer.

  • storage — A map of key-value pairs representing the storage slots of the contract. The keys and values are both encoded as hexadecimal strings.

Struct/opcode response

• The transaction trace object:

• failed - Successful or failed

• gas - The total consumed gas in the transaction

• returnValue - The return value of the executed contract call

• structLogs - The trace result of each step:

  • pc - The current index in bytecode.

  • op - The name of current executing operation.

  • gas - The available gas in the execution.

  • gasCost - The gas cost of the operation.

  • depth- The number of levels of calling functions.

  • stack - An array of values in the current stack.

  • storage - The mapping of the current storage.

  • refund - The total of current refund value.

  • error- The error of the execution.

  • memory - An array of values in the current memory.

Request

POST https://<network>.chainnodes.org/YOUR-API-KEY

Example

curl https://polygon-mainnet.chainnodes.org/YOUR-API-KEY \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"method":"debug_traceTransaction","params":["0xd19320daa641b029c043a8eeab7cc3f5a19c3c213119c72cf97b9a32428f0278", {"tracer": "callTracer"}],"id":1,"jsonrpc":"2.0"}'

Body

{
"jsonrpc":"2.0",
"id":1,
"result":{
"from":"0x95222290dd7278aa3ddd389cc1e1d165cc4bafe5",
"gas":"0x2328",
"gasUsed":"0x5208",
"to":"0x6d2e03b7effeae98bd302a9f836d0d6ab0002766",
"input":"0x",
"value":"0x2b983193126b4ff",
"type":"CALL"
}
}

JSON-RPC API Documentation by CHAINNODES is based on Erigon node client. Contact us if you are interested in specific methods that are only available on geth, besu, Nethermind or reth.