> ## Documentation Index
> Fetch the complete documentation index at: https://docs.soo.network/llms.txt
> Use this file to discover all available pages before exploring further.

# SimulateTransaction

## simulateTransaction RPC Method

Simulate sending a transaction.

#### Method Information

* The transaction must have a valid blockhash
* Not required to be signed
* Allows testing transaction execution without actually sending it to the network

<div className="grid grid-cols-2 gap-1 mt-2">
  <div className="col-span-1">
    #### Parameters

    `string` **required**\
    Transaction, as an encoded string

    `object` **optional**\
    Configuration object containing the following fields:

    **commitment** `string` **optional**\\

    * Default: `finalized`
    * Commitment level to simulate the transaction at

    **sigVerify** `bool` **optional**\\

    * If `true`, transaction signatures will be verified
    * Conflicts with `replaceRecentBlockhash`

    **replaceRecentBlockhash** `bool` **optional**\\

    * If `true`, replaces the transaction's recent blockhash with the most recent blockhash
    * Conflicts with `sigVerify`

    **minContextSlot** `number` **optional**\\

    * Minimum slot that the request can be evaluated at

    **encoding** `string` **optional**\\

    * Default: `base58`
    * Encoding used for transaction data

    **Allowed Encoding Values:**

    * `base58` (*slow*, **DEPRECATED**)
    * `base64`

    **innerInstructions** `bool` **optional**\\

    * If `true`, response will include inner instructions
    * Inner instructions will be `jsonParsed` where possible

    **accounts** `object` **optional**\\

    * Accounts configuration object
      * `addresses`: Array of accounts to return (base-58 encoded strings)
      * `encoding`: Encoding for returned account data
        * Default: `base64`
        * Values: `base64`, `base58`, `base64+zstd`, `jsonParsed`
  </div>

  <div className="col-span-1">
    #### Code Sample

    ```bash theme={"system"}
    curl https://rpc.testnet.soo.network/rpc \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{
      "jsonrpc": "2.0",
      "id": 1,
      "method": "simulateTransaction",
      "params": [
        "AQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAED10jMAfX8Ue4203MSpqzrJiy6UblHKSjE2XgziZTOo9IYryKvnI8Ktte81tibEA/lHkHTZwblOqoWwCvc8dth4gAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAwI0timn1vUjmelkWIwKhw93lLnwOrAFFyq3LKby0SNoBAgIAAQwCAAAAAOQLVAIAAAA=",
        {
          "commitment": "finalized",
          "encoding": "base64",
          "innerInstructions": true,
          "accounts": {
            "addresses": ["FVP39NNZMKfEDzbg3BWWZEiYPH3wyFp5kmtuN3M2AZFo"],
            "encoding": "jsonParsed"
          }
        }
      ]
    }'
    ```

    #### Response

    ```json theme={"system"}
    {
      "jsonrpc": "2.0",
      "result": {
        "context": {
          "apiVersion": "2.0.14",
          "slot": 406970
        },
        "value": {
          "accounts": [
            {
              "data": [
                "",
                "base64"
              ],
              "executable": false,
              "lamports": 20958674016,
              "owner": "11111111111111111111111111111111",
              "rentEpoch": 18446744073709551615,
              "space": 0
            }
          ],
          "err": null,
          "innerInstructions": [],
          "logs": [
            "Program 11111111111111111111111111111111 invoke [1]",
            "Program 11111111111111111111111111111111 success"
          ],
          "replacementBlockhash": null,
          "returnData": null,
          "unitsConsumed": 150
        }
      },
      "id": 1
    }
    ```
  </div>
</div>

#### Result Details

The result is an RpcResponse JSON object with `value` containing:

* `context: <object>`
  * `apiVersion: <string>` - Version of the API
  * `slot: <u64>` - Slot at which the simulation was performed

* `value: <object>`
  * `accounts: <array>` - Requested account information
    * Each account contains:
      * `data`: Account data
      * `executable`: Whether account is executable
      * `lamports`: Account balance
      * `owner`: Program owning the account
      * `rentEpoch`: Epoch for next rent payment
      * `space`: Account data size

  * `err: <object|null>` - Transaction error details

  * `innerInstructions: <array>` - Inner instructions (if any)

  * `logs: <array>` - Program execution log messages

  * `replacementBlockhash: <string|null>` - Replacement blockhash if applicable

  * `returnData: <object|null>` - Return data from instructions

  * `unitsConsumed: <u64>` - Compute units consumed

#### Important Notes

* Allows testing transaction execution without network submission
* Provides detailed insights into potential transaction outcomes
* Helpful for debugging and validating transactions before sending