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debug_traceCall RPC Method

Performs a simulated call and returns comprehensive trace details without submitting an actual transaction.

Updated on
Jun 10, 2026
This method requires appending /nanoreth to your HyperLiquid endpoint URL. Debug and Trace methods are not supported on /evm endpoints. Use /nanoreth instead of /evm to access debugging functionality.

Parameters

object
object

The transaction call object with the following fields:

from
string

The address the transaction is sent from

to
string
REQUIRED

The address the transaction is directed to

gas
integer

The integer of the gas provided for the transaction execution

gasPrice
integer

The integer of the gasPrice used for each paid gas

value
integer

The integer of the value sent with this transaction

data
string

The hash of the method signature and encoded parameters, see the Ethereum Contract ABI

blockNumber
string
REQUIRED

The block number as a string in hexadecimal format or tags. The supported tag values include earliest for the earliest/genesis block, latest for the latest mined block, pending for the pending state/transactions, safe for the most recent secure block, and finalized for the most recent secure block accepted by more than 2/3 of validators

object
object
REQUIRED

The tracer object with the following fields:

tracer
string

The type of tracer. It could be callTracer or prestateTracer

callTracer
string

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

prestateTracer
string

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

tracerConfig
object

The object to specify the configurations of the tracer

onlyTopCall
boolean

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

timeout
string

A string of decimal integers that overrides the JavaScript-based tracing calls default timeout of 5 seconds

Returns

result
object

The trace result object

from
string

The address the transaction is sent from

gas
string

The integer of the gas provided for the transaction execution

gasUsed
string

The integer of the gas used

to
string

The address the transaction is directed to

input
string

The data given at the time of input

value
string

The value transferred in the transaction

type
string

The type of transaction call

output
string

(Optional) The data which is returned as an output

error
string

(Optional) Error message if the transaction execution failed

calls
array

(Optional) A list of sub-calls made during transaction execution

from
string

The address the call is sent from

gas
string

The gas provided for the call execution

gasUsed
string

The gas used by the call

to
string

The address the call is directed to

input
string

The call data

output
string

(Optional) The call output data

type
string

The type of call (CALL, STATICCALL, DELEGATECALL)

value
string

The value transferred in the call

Request
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