trace_call | Alchemy Docs

1 curl -X POST https://eth-mainnet.g.alchemy.com/v2/{apiKey} \ 2 -H "Content-Type: application/json" \ 3 -d '{ 4 "jsonrpc": "2.0", 5 "method": "trace_call", 6 "params": [ 7 { 8 "from": "0x6f1FB6EFDf50F34bFA3F2bC0E5576EdD71631638", 9 "to": "0x1E0447b19BB6EcFdAe1e4AE1694b0C3659614e4e", 10 "value": "0x0", 11 "data": "0xa67a6a45000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000" 12 }, 13 [ 14 "trace" 15 ], 16 "latest" 17 ], 18 "id": 1 19 }'

1 { 2 "jsonrpc": "2.0", 3 "id": "1", 4 "result": { 5 "jsonrpc": "2.0", 6 "id": 0, 7 "result": { 8 "output": "0x", 9 "stateDiff": "", 10 "trace": [ 11 { 12 "name": "trace item", 13 "value": { 14 "action": { 15 "callType": "call", 16 "from": "0x6f1fb6efdf50f34bfa3f2bc0e5576edd71631638", 17 "gas": "0x1dcd11f8", 18 "input": "0xa67a6a45000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000", 19 "to": "0x1e0447b19bb6ecfdae1e4ae1694b0C3659614e4e", 20 "value": "0x0" 21 }, 22 "error": "Reverted", 23 "subtraces": "0", 24 "traceAddress": [], 25 "type": "call" 26 } 27 } 28 ], 29 "vmTrace": null 30 } 31 } 32 }

Executes a call and returns one or more possible traces.

Path parameters

apiKeystringRequired

Request

This endpoint expects an object.

transactionobjectRequired

Transaction call object. Contains call parameters such as "from", "to", "gas", "gasPrice", "value", and "data".

traceTypeslist of enumsRequired

Array of trace types to return. Valid values include "trace" and "stateDiff".

Allowed values:

blockIdentifierstringOptional

Optional block identifier (block number in hex, block hash, or tag like “latest”).

Response

Returns the trace result for the given call.

outputstring or null

stateDiffstring or null

tracelist of objects or null

vmTracestring or null