Simulate Transaction
curl --request POST \
--url https://api.example.com/v1/simulate \
--header 'Content-Type: application/json' \
--data '
{
"transaction": "<string>"
}
'import requests
url = "https://api.example.com/v1/simulate"
payload = { "transaction": "<string>" }
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({transaction: '<string>'})
};
fetch('https://api.example.com/v1/simulate', 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://api.example.com/v1/simulate",
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([
'transaction' => '<string>'
]),
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://api.example.com/v1/simulate"
payload := strings.NewReader("{\n \"transaction\": \"<string>\"\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://api.example.com/v1/simulate")
.header("Content-Type", "application/json")
.body("{\n \"transaction\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.example.com/v1/simulate")
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 \"transaction\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"resourceFee": "<string>",
"latestLedger": 123,
"transactionData": "<string>",
"events": [
{}
]
}API Reference
Simulate Transaction
Simulate a Soroban transaction for resource estimates.
POST
/
v1
/
simulate
Simulate Transaction
curl --request POST \
--url https://api.example.com/v1/simulate \
--header 'Content-Type: application/json' \
--data '
{
"transaction": "<string>"
}
'import requests
url = "https://api.example.com/v1/simulate"
payload = { "transaction": "<string>" }
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({transaction: '<string>'})
};
fetch('https://api.example.com/v1/simulate', 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://api.example.com/v1/simulate",
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([
'transaction' => '<string>'
]),
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://api.example.com/v1/simulate"
payload := strings.NewReader("{\n \"transaction\": \"<string>\"\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://api.example.com/v1/simulate")
.header("Content-Type", "application/json")
.body("{\n \"transaction\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.example.com/v1/simulate")
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 \"transaction\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"resourceFee": "<string>",
"latestLedger": 123,
"transactionData": "<string>",
"events": [
{}
]
}Interacts with the Soroban RPC to simulate the execution of a transaction. This is required for smart contract calls to determine resource fees and footprints.
View on GitHub
Request Body
string
required
The base64-encoded XDR of the transaction to simulate.
Response Fields
string
The estimated Soroban resource fee in stroops.
number
The ledger number used for the simulation.
string
The base64-encoded
SorobanTransactionData containing the required footprints.array
A list of diagnostic events emitted during the simulation.
Error Codes
| Code | Description |
|---|---|
VALIDATION_ERROR | The provided XDR is not a valid Soroban transaction. |
SIMULATION_FAILED | The smart contract execution failed or panicked. |
SDK Example
import { Grat } from '@grat-official-sdk/sdk';
const grat = Grat.testnet();
const simulation = await grat.simulate(sorobanTx);
console.log(simulation.resourceFee);
⌘I