Debug methods

The debug API methods allow you to inspect and debug the network. Infura supports the following debug methods on the Mantle network:

• debug_storageRangeAt
• debug_traceBlock
• debug_traceBlockByHash
• debug_traceBlockByNumber
• debug_traceTransaction
• debug_traceCall

Debug tracing types

The debug methods support the callTracer and prestateTracer tracing types, which return different results when specified in the supported debug methods.

callTracer

The callTracer tracing type tracks all the call frames executed during a transaction, including the initial call. It returns a nested list of call frames, resembling how the EVM works. They form a tree with the top-level call at root and sub-calls as children of the higher levels.

The callTracer type returns an object with the following results:

Field	Type	Description
type	string	The type of call.
from	string	The address the transaction is sent from.
to	string	The address the transaction is directed to.
value	string	The amount transferred in the call (hex-encoded).
gas	string	The amount of gas provided for the call (hex-encoded).
gasUsed	string	The amount of gas used by the call (hex-encoded).
input	string	The call data.
output	string	The return data.
error	string	If an error occurred during the call, this field will contain the error message.
revertReason	string	If the contract execution was reverted, this field will contain the reason for the revert (if provided by Solidity).
calls	array	Sub-calls made by the contract during the execution of the transaction.

prestateTracer

The prestateTracer tracing type records and tracks every change made to the state during the execution of transactions. It generates an object that contains keys representing the addresses of the accounts involved in the transactions. The corresponding values are objects that include specific fields related to the state changes made during the transaction:

Field	Type	Description
balance	string	The account balance.
nonce	uint64	The nonce value for the transaction.
code	string	The hex-encoded bytecode.
storage	map	The storage slots of the contract.