trace_call | BNB Chain

BNB API method trace_call allows for executing a call transaction and returns several possible traces for it. This method simulates transactions without broadcasting them to the network, allowing developers to test and debug their transactions in a controlled environment.

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Parameters

• transaction — the transaction to be executed, specified as an object with fields including:
  • from — the address sending the transaction.
  • to — the address of the transaction recipient.
  • gas — the amount of gas allocated for the transaction.
  • gasPrice — the price per unit of gas.
  • value — the amount of ether to send.
  • data — the data to be sent with the transaction.
• traceTypes — an array of strings specifying the types of traces to return, with options including:
  • vmTrace — virtual machine trace.
  • trace — standard execution trace.
  • stateDiff — state difference trace.
• blockNumber — the block number against which the transaction should be executed, with values:
  • specific block number — execute against the specified block.
  • earliest — the earliest block (usually genesis).
  • latest — the most recent block.
  • pending — the current pending state and transactions.

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Response

• result — Depending on the requested traceTypes, the result may include various forms of trace data such as VM operation trace, state changes, and executed transaction trace. This data is crucial for understanding how a transaction interacts with the EVM and alters the blockchain state.

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Use case

A possible use case for the trace_call method in BNB is for smart contract developers who must debug complex interactions with the Ethereum Virtual Machine (EVM). Developers can identify and fix issues by simulating transactions before deploying contracts or sending transactions on the live network. It can also be used to estimate gas usage more accurately or verify that a transaction will behave as expected without actually making a state change on the blockchain.