trace_call
curl --request POST \
--url https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/ \
--header 'Content-Type: application/json' \
--data '
{
"id": 1,
"jsonrpc": "2.0",
"method": "trace_call",
"params": [
{
"from": "0x5d20879655df3c1e04ab111af0009ad650e762f0",
"to": "0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e",
"gas": "0xf4240",
"data": "0x"
},
[
"trace"
],
"latest"
]
}
'import requests
url = "https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"
payload = {
"id": 1,
"jsonrpc": "2.0",
"method": "trace_call",
"params": [
{
"from": "0x5d20879655df3c1e04ab111af0009ad650e762f0",
"to": "0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e",
"gas": "0xf4240",
"data": "0x"
},
["trace"],
"latest"
]
}
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({
id: 1,
jsonrpc: '2.0',
method: 'trace_call',
params: [
{
from: '0x5d20879655df3c1e04ab111af0009ad650e762f0',
to: '0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e',
gas: '0xf4240',
data: '0x'
},
['trace'],
'latest'
]
})
};
fetch('https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/', 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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/",
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([
'id' => 1,
'jsonrpc' => '2.0',
'method' => 'trace_call',
'params' => [
[
'from' => '0x5d20879655df3c1e04ab111af0009ad650e762f0',
'to' => '0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e',
'gas' => '0xf4240',
'data' => '0x'
],
[
'trace'
],
'latest'
]
]),
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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"
payload := strings.NewReader("{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"trace_call\",\n \"params\": [\n {\n \"from\": \"0x5d20879655df3c1e04ab111af0009ad650e762f0\",\n \"to\": \"0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e\",\n \"gas\": \"0xf4240\",\n \"data\": \"0x\"\n },\n [\n \"trace\"\n ],\n \"latest\"\n ]\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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")
.header("Content-Type", "application/json")
.body("{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"trace_call\",\n \"params\": [\n {\n \"from\": \"0x5d20879655df3c1e04ab111af0009ad650e762f0\",\n \"to\": \"0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e\",\n \"gas\": \"0xf4240\",\n \"data\": \"0x\"\n },\n [\n \"trace\"\n ],\n \"latest\"\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")
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 \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"trace_call\",\n \"params\": [\n {\n \"from\": \"0x5d20879655df3c1e04ab111af0009ad650e762f0\",\n \"to\": \"0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e\",\n \"gas\": \"0xf4240\",\n \"data\": \"0x\"\n },\n [\n \"trace\"\n ],\n \"latest\"\n ]\n}"
response = http.request(request)
puts response.read_body{
"jsonrpc": "2.0",
"id": 1,
"result": {
"output": "0x",
"stateDiff": null,
"trace": [
{
"type": "call",
"action": {
"from": "0x5d20879655df3c1e04ab111af0009ad650e762f0",
"callType": "call",
"gas": "0xef038",
"input": "0x",
"to": "0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e",
"value": "0x0"
},
"error": "Reverted",
"result": {
"gasUsed": "0x2e",
"output": "0x"
},
"subtraces": 0,
"traceAddress": []
}
],
"vmTrace": null
}
}Arc node API
trace_call | Arc
Arc API method that traces a call without creating a transaction. This provides detailed execution traces using the Parity/OpenEthereum trace format.
POST
/
trace_call
curl --request POST \
--url https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/ \
--header 'Content-Type: application/json' \
--data '
{
"id": 1,
"jsonrpc": "2.0",
"method": "trace_call",
"params": [
{
"from": "0x5d20879655df3c1e04ab111af0009ad650e762f0",
"to": "0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e",
"gas": "0xf4240",
"data": "0x"
},
[
"trace"
],
"latest"
]
}
'import requests
url = "https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"
payload = {
"id": 1,
"jsonrpc": "2.0",
"method": "trace_call",
"params": [
{
"from": "0x5d20879655df3c1e04ab111af0009ad650e762f0",
"to": "0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e",
"gas": "0xf4240",
"data": "0x"
},
["trace"],
"latest"
]
}
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({
id: 1,
jsonrpc: '2.0',
method: 'trace_call',
params: [
{
from: '0x5d20879655df3c1e04ab111af0009ad650e762f0',
to: '0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e',
gas: '0xf4240',
data: '0x'
},
['trace'],
'latest'
]
})
};
fetch('https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/', 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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/",
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([
'id' => 1,
'jsonrpc' => '2.0',
'method' => 'trace_call',
'params' => [
[
'from' => '0x5d20879655df3c1e04ab111af0009ad650e762f0',
'to' => '0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e',
'gas' => '0xf4240',
'data' => '0x'
],
[
'trace'
],
'latest'
]
]),
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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/"
payload := strings.NewReader("{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"trace_call\",\n \"params\": [\n {\n \"from\": \"0x5d20879655df3c1e04ab111af0009ad650e762f0\",\n \"to\": \"0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e\",\n \"gas\": \"0xf4240\",\n \"data\": \"0x\"\n },\n [\n \"trace\"\n ],\n \"latest\"\n ]\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://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")
.header("Content-Type", "application/json")
.body("{\n \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"trace_call\",\n \"params\": [\n {\n \"from\": \"0x5d20879655df3c1e04ab111af0009ad650e762f0\",\n \"to\": \"0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e\",\n \"gas\": \"0xf4240\",\n \"data\": \"0x\"\n },\n [\n \"trace\"\n ],\n \"latest\"\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://arc-testnet.core.chainstack.com/6caa7fd90475ac9214f7521dd460fa7c/")
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 \"id\": 1,\n \"jsonrpc\": \"2.0\",\n \"method\": \"trace_call\",\n \"params\": [\n {\n \"from\": \"0x5d20879655df3c1e04ab111af0009ad650e762f0\",\n \"to\": \"0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e\",\n \"gas\": \"0xf4240\",\n \"data\": \"0x\"\n },\n [\n \"trace\"\n ],\n \"latest\"\n ]\n}"
response = http.request(request)
puts response.read_body{
"jsonrpc": "2.0",
"id": 1,
"result": {
"output": "0x",
"stateDiff": null,
"trace": [
{
"type": "call",
"action": {
"from": "0x5d20879655df3c1e04ab111af0009ad650e762f0",
"callType": "call",
"gas": "0xef038",
"input": "0x",
"to": "0x7798f2eb73c1dd8fa8086d780d5cf114a10f528e",
"value": "0x0"
},
"error": "Reverted",
"result": {
"gasUsed": "0x2e",
"output": "0x"
},
"subtraces": 0,
"traceAddress": []
}
],
"vmTrace": null
}
}Arc API method that traces a call without creating a transaction. This provides detailed execution traces using the Parity/OpenEthereum trace format.
The following example traces a
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Parameters
callObject— the call object:from— (optional) sender addressto— recipient addressgas— (optional) gas limitgasPrice— (optional) gas pricevalue— (optional) value to senddata— (optional) call data
traceTypes— array of trace types to include:trace— basic execution tracevmTrace— full VM execution tracestateDiff— state changes
blockParameter— the block number (hex) or tag (latest,earliest,pending)
Response
result— the trace result object:output— return data from the calltrace— array of trace objects (if requested)vmTrace— VM execution trace (if requested)stateDiff— state differences (if requested)
trace_call code examples
The following example traces a balanceOf call on the pathUSD token:
const ethers = require('ethers');
const NODE_URL = "CHAINSTACK_NODE_URL";
const provider = new ethers.JsonRpcProvider(NODE_URL);
// pathUSD token address
const PATHUSD = "0x20c0000000000000000000000000000000000000";
const TARGET_ADDRESS = "0x9729187D9E8Bbefa8295F39f5634cA454dd9d294";
// Encode balanceOf(address)
const iface = new ethers.Interface(["function balanceOf(address) view returns (uint256)"]);
const data = iface.encodeFunctionData("balanceOf", [TARGET_ADDRESS]);
const traceCall = async () => {
const result = await provider.send("trace_call", [
{
to: PATHUSD,
data: data
},
["trace", "stateDiff"],
"latest"
]);
console.log("Output:", result.output);
console.log("Traces:", result.trace.length);
if (result.stateDiff) {
console.log("State changes:", Object.keys(result.stateDiff).length, "addresses affected");
}
};
traceCall();
from web3 import Web3
node_url = "CHAINSTACK_NODE_URL"
web3 = Web3(Web3.HTTPProvider(node_url))
# pathUSD token address
PATHUSD = "0x20c0000000000000000000000000000000000000"
TARGET_ADDRESS = "0x9729187D9E8Bbefa8295F39f5634cA454dd9d294"
# balanceOf(address) calldata
data = "0x70a08231000000000000000000000000" + TARGET_ADDRESS[2:].lower()
result = web3.provider.make_request("trace_call", [
{
"to": PATHUSD,
"data": data
},
["trace", "stateDiff"],
"latest"
])
trace_result = result['result']
print(f"Output: {trace_result['output']}")
print(f"Traces: {len(trace_result['trace'])}")
if trace_result.get('stateDiff'):
print(f"State changes: {len(trace_result['stateDiff'])} addresses affected")
curl -X POST "CHAINSTACK_NODE_URL" \
-H "Content-Type: application/json" \
-d '{
"jsonrpc": "2.0",
"method": "trace_call",
"params": [
{
"to": "0x20c0000000000000000000000000000000000000",
"data": "0x70a082310000000000000000000000009729187d9e8bbefa8295f39f5634ca454dd9d294"
},
["trace", "stateDiff"],
"latest"
],
"id": 1
}'
Last modified on August 3, 2026
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