## Documentation Index

Fetch the complete documentation index at: [/docs/llms.txt](/content/docs/llms.txt)

Use this file to discover all available pages before exploring further.

### Request Parameters

#### params[0]
- **type**: object  
  - **required**: First configuration object. Contains the encoded transactions for the simulation.

#### params[0].encodedTransactions
- **type**: array  
  - **description**: Array of encoded, serialized transactions for simulation. The encoding is determined by the `transactionEncoding` field (base-64 by default).

#### params[1]
- **type**: object  
  - **optional**: Second configuration object.

#### params[1].preExecutionAccountsConfigs
- **type**: array  
  - **description**: Specifies which accounts to capture during simulation.

#### params[1].postExecutionAccountsConfigs
- **type**: array  
  - **description**: Specifies which accounts to capture during simulation.

#### params[1].transactionEncoding
- **type**: string  
  - **default**: "base64"
  - **description**: The transaction encoding used in `encodedTransactions`.

#### params[1].skipSigVerify
- **type**: boolean
  - **default**: "false"
  - **description**: Whether to skip signature verification before simulation.

#### params[1].replaceRecentBlockhash
- **type**: boolean
  - **default**: "false"
  - **description**: Whether to replace the simulated transaction’s recent blockhash with the latest blockhash.

### Example cURL Request

```bash
curl --request POST \
  --url 'https://mainnet.helius-rpc.com/?api-key=' \
  --header 'Content-Type: application/json' \
  --data '{
    "jsonrpc": "2.0",
    "id": "1",
    "method": "simulateBundle",
    "params": [
      {
        "encodedTransactions": [
          "AUpZwml/cvAaQoRINPCXI/+Zp1bEG31TsbQ7YkESdUqtoGHrGSlZWLGh7qsa54Pon3RCx46Z6l+IlAgV8GNmbgcBAAED48eIT6fA5gQUuhts6qDwJ8rp6qemton7jK+tSNA6uiM3FVSCTsdmSMNKqTIUrKARpzIIQabdGWwDk74PLnrd/QAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAASgbUMGWXPNjQAwed9kPYG5gXZsBq9jrSuVNeTuC4o0IBAgIAAQwCAAAA6AMAAAAAAAA="
        ]
      },
      {
        "preExecutionAccountsConfigs": [
          null
        ],
        "postExecutionAccountsConfigs": [
          null
        ],
        "skipSigVerify": true,
        "transactionEncoding": "base64",
        "replaceRecentBlockhash": true
      }
    ]
}'
```

### Example Python Request

```python
import requests

url = "https://mainnet.helius-rpc.com/?api-key="

payload = {
    "jsonrpc": "2.0",
    "id": "1",
    "method": "simulateBundle",
    "params": [
        {
            "encodedTransactions": [
                "AUpZwml/cvAaQoRINPCXI/+Zp1bEG31TsbQ7YkESdUqtoGHrGSlZWLGh7qsa54Pon3RCx46Z6l+IlAgV8GNmbgcBAAED48eIT6fA5gQUuhts6qDwJ8rp6qemton7jK+tSNA6uiM3FVSCTsdmSMNKqTIUrKARpzIIQabdGWwDk74PLnrd/QAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAASgbUMGWXPNjQAwed9kPYG5gXZsBq9jrSuVNeTuC4o0IBAgIAAQwCAAAA6AMAAAAAAAA="
            ]
        },
        {
            "preExecutionAccountsConfigs": [None],
            "postExecutionAccountsConfigs": [None],
            "skipSigVerify": True,
            "transactionEncoding": "base64",
            "replaceRecentBlockhash": True
        }
    ]
}
headers = {"Content-Type": "application/json"}

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

print(response.text)
```

### Example Go Request

```go
package main

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

func main() {

url := "https://mainnet.helius-rpc.com/?api-key="

payload := strings.NewReader("{\n  \"jsonrpc\": \"2.0\",\n  \"id\": \"1\",\n  \"method\": \"simulateBundle\",\n  \"params\": [\n    {\n      \"encodedTransactions\": [\n        \"AUpZwml/cvAaQoRINPCXI/+Zp1bEG31TsbQ7YkESdUqtoGHrGSlZWLGh7qsa54Pon3RCx46Z6l+IlAgV8GNmbgcBAAED48eIT6fA5gQUuhts6qDwJ8rp6qemton7jK+tSNA6uiM3FVSCTsdmSMNKqTIUrKARpzIIQabdGWwDk74PLnrd/QAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAASgbUMGWXPNjQAwed9kPYG5gXZsBq9jrSuVNeTuC4o0IBAgIAAQwCAAAA6AMAAAAAAAA=\"\n      ]\n    },\n    {\n      \"preExecutionAccountsConfigs\": [\n        null\n      ],\n      \"postExecutionAccountsConfigs\": [\n        null\n      ],\n      \"skipSigVerify\": true,\n      \"transactionEncoding\": \"base64\",\n      \"replaceRecentBlockhash\": true\n    }\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))
}
```

### Example PHP Request

```php
<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://mainnet.helius-rpc.com/?api-key=",
  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',
    'id' => '1',
    'method' => 'simulateBundle',
    'params' => [
        [
            'encodedTransactions' => [
                'AUpZwml/cvAaQoRINPCXI/+Zp1bEG31TsbQ7YkESdUqtoGHrGSlZWLGh7qsa54Pon3RCx46Z6l+IlAgV8GNmbgcBAAED48eIT6fA5gQUuhts6qDwJ8rp6qemton7jK+tSNA6uiM3FVSCTsdmSMNKqTIUrKARpzIIQabdGWwDk74PLnrd/QAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAASgbUMGWXPNjQAwed9kPYG5gXZsBq9jrSuVNeTuC4o0IBAgIAAQwCAAAA6AMAAAAAAAA="
            ]
        ],
        [
            'preExecutionAccountsConfigs' => [
                null
            ],
            'postExecutionAccountsConfigs' => [
                null
            ],
            'skipSigVerify' => true,
            'transactionEncoding' => 'base64',
            'replaceRecentBlockhash' => true
        ]
    ]
]),
  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;
}
?>
```

### Response Codes

- 200: Successfully simulated the bundle.
- 400: Bad request.
- 401: Unauthorized.
- 429: Too many requests.
- 500: Internal server error.
- 503: Service unavailable.
- 504: Gateway timeout.