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POST
/
trace_replayTransaction
curl --request POST \
  --url https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "trace_replayTransaction",
  "params": [
    "0xb3e821e696897b02283b7b2d602941b1d3cb08448d3a204bab05955215fc2035",
    [
      "trace"
    ]
  ],
  "id": 1
}
'
import requests

url = "https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/"

payload = {
    "jsonrpc": "2.0",
    "method": "trace_replayTransaction",
    "params": ["0xb3e821e696897b02283b7b2d602941b1d3cb08448d3a204bab05955215fc2035", ["trace"]],
    "id": 1
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)
const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    jsonrpc: '2.0',
    method: 'trace_replayTransaction',
    params: [
      '0xb3e821e696897b02283b7b2d602941b1d3cb08448d3a204bab05955215fc2035',
      ['trace']
    ],
    id: 1
  })
};

fetch('https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));
<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'jsonrpc' => '2.0',
    'method' => 'trace_replayTransaction',
    'params' => [
        '0xb3e821e696897b02283b7b2d602941b1d3cb08448d3a204bab05955215fc2035',
        [
                'trace'
        ]
    ],
    'id' => 1
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/"

	payload := strings.NewReader("{\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"trace_replayTransaction\",\n  \"params\": [\n    \"0xb3e821e696897b02283b7b2d602941b1d3cb08448d3a204bab05955215fc2035\",\n    [\n      \"trace\"\n    ]\n  ],\n  \"id\": 1\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}
HttpResponse<String> response = Unirest.post("https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/")
  .header("Content-Type", "application/json")
  .body("{\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"trace_replayTransaction\",\n  \"params\": [\n    \"0xb3e821e696897b02283b7b2d602941b1d3cb08448d3a204bab05955215fc2035\",\n    [\n      \"trace\"\n    ]\n  ],\n  \"id\": 1\n}")
  .asString();
require 'uri'
require 'net/http'

url = URI("https://tempo-mainnet.core.chainstack.com/c3ce2925b51f1ed18719fe8a23bbdccf/")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"trace_replayTransaction\",\n  \"params\": [\n    \"0xb3e821e696897b02283b7b2d602941b1d3cb08448d3a204bab05955215fc2035\",\n    [\n      \"trace\"\n    ]\n  ],\n  \"id\": 1\n}"

response = http.request(request)
puts response.read_body
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": {}
}
Tempo API method that replays a specific transaction and returns detailed execution traces. This is useful for debugging transaction behavior with customizable trace options.
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​
Parameters

  • transactionHash — the hash of the transaction to replay
  • traceTypes — array of trace types to include:
    • trace — basic execution trace
    • vmTrace — full VM execution trace
    • stateDiff — state changes

​
Response

  • result — trace result object:
    • output — return data from the transaction
    • trace — array of trace objects (if requested)
    • vmTrace — VM execution trace (if requested)
    • stateDiff — state differences (if requested)

​
trace_replayTransaction code examples

const ethers = require('ethers');
const NODE_URL = "CHAINSTACK_NODE_URL";
const provider = new ethers.JsonRpcProvider(NODE_URL);

const replayTransaction = async (txHash) => {
    // Replay with all trace types
    const result = await provider.send("trace_replayTransaction", [
      txHash,
      ["trace", "stateDiff"]
    ]);

    console.log("Transaction Output:", result.output);
    console.log("Traces:", result.trace?.length || 0);

    if (result.trace) {
      for (const trace of result.trace) {
        const callType = trace.action.callType || trace.type;
        const to = trace.action.to || "Contract Creation";
        console.log(`  ${callType}: ${trace.action.from} -> ${to}`);
      }
    }

    if (result.stateDiff) {
      console.log("\nState changes:");
      for (const [address, diff] of Object.entries(result.stateDiff)) {
        console.log(`  ${address}:`);
        if (diff.balance) {
          console.log(`    Balance: ${diff.balance['*']?.from || 'new'} -> ${diff.balance['*']?.to || diff.balance['+']}`);
        }
      }
    }
  };

replayTransaction("0xb3e821e696897b02283b7b2d602941b1d3cb08448d3a204bab05955215fc2035");

from web3 import Web3

node_url = "CHAINSTACK_NODE_URL"
web3 = Web3(Web3.HTTPProvider(node_url))

result = web3.provider.make_request("trace_replayTransaction", [
    "0xb3e821e696897b02283b7b2d602941b1d3cb08448d3a204bab05955215fc2035",
    ["trace", "stateDiff"]
])

trace_result = result['result']
print(f"Transaction Output: {trace_result['output']}")
print(f"Traces: {len(trace_result.get('trace', []))}")

for trace in trace_result.get('trace', []):
    call_type = trace['action'].get('callType', trace['type'])
    to = trace['action'].get('to', 'Contract Creation')
    print(f"  {call_type}: {trace['action']['from']} -> {to}")

if trace_result.get('stateDiff'):
    print("\nState changes:")
    for address, diff in trace_result['stateDiff'].items():
        print(f"  {address}")

curl -X POST "CHAINSTACK_NODE_URL" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "trace_replayTransaction",
    "params": ["0xb3e821e696897b02283b7b2d602941b1d3cb08448d3a204bab05955215fc2035", ["trace", "stateDiff"]],
    "id": 1
  }'

Body

application/json
​
jsonrpc
string
default:2.0
​
method
string
default:trace_replayTransaction
​
params
any[]

Transaction hash and trace types array

​
id
integer
default:1

Response

200 - application/json

Replayed transaction trace

​
jsonrpc
string
​
id
integer
​
result
object

Trace result object with output, trace, vmTrace, and stateDiff

Last modified on June 22, 2026