simulateTransaction RPC Method

Parameters

transaction

string

The transaction as an encoded string. The transaction must have a valid blockhash, but is not required to be signed

object

array

The configuration object with the following fields:

commitment

string

(default: finalized) The level of commitment required for the query. The options include:

finalized

string

The node will query the most recent block confirmed by the supermajority of the cluster as having reached maximum lockout, meaning the cluster has recognized this block as finalized

confirmed

string

The node will query the most recent block that has been voted on by the supermajority of the cluster

processed

string

The node will query its most recent block. Note that the block may not be complete

sigVerify

boolean

(default: false) If true, the transaction signatures will be verified (conflicts with replaceRecentBlockhash)

replaceRecentBlockhash

boolean

(default: false) If true, the transaction recent blockhash will be replaced with the most recent blockhash (conflicts with sigVerify)

encoding

string

(default: base58) The encoding format for account data. It can be either base58 (slow, DEPRECATED) or base64

minContextSlot

integer

The minimum slot at which the request can be evaluated

innerInstructions

boolean

(default: false) If true the response will include inner instructions. These inner instructions will be jsonParsed where possible, otherwise json.

accounts

object

The accounts configuration object containing the following fields:

addresses

string

An array of accounts to return, as base-58 encoded strings

encoding

string

The encoding format for account data. It can be one of base58 (slow), base64, base64+zstd or jsonParsed

Returns

result

Null if the account doesn't exist otherwise RpcResponse JSON object with the following fields:

context

An object that contains metadata about the current state of the Solana network at the time the request was processed

apiVersion

The version number

slot

The current slot in the Solana cluster during which the transactions are processed and new blocks are added to the blockchain

err

Error code if the transaction failed or null if the transaction succeeds

logs

An array of log messages the transaction instructions output during execution, null if simulation failed before the transaction was able to execute (for example due to an invalid blockhash or signature verification failure)

accounts

An array of accounts with the same length as the accounts.addresses array in the request

null

If the account doesn't exist or if err is not null

object

otherwise, a JSON object containing:

lamports

The number of lamports assigned to this account as u64 (64-bit unsigned integer)

owner

The base-58 encoded Pubkey of the program this account has been assigned to

data

The data associated with the account, either as encoded binary data or JSON format {'program': 'state'}, depending on encoding parameter

executable

A boolean indicating if the account contains a program (and is strictly read-only)

rentEpoch

The epoch at which this account will next owe rent, as u64 (64-bit unsigned integer)

unitsConsumed

The number of compute budget units consumed during the processing of this transaction

returnData

The most-recent return data generated by an instruction in the transaction, with the following fields:

programId

string

The program that generated the return data, as base-58 encoded Pubkey

data

The return data itself, as base-64 encoded binary data

innerInstructions

The value is a list of inner instructions.

Request

curl https://docs-demo.solana-mainnet.quiknode.pro/ \
  -X POST \
  -H "Content-Type: application/json" \
  --data '{"method":"simulateTransaction","params":["ENTER_ENCODED_TRANSACTION_ID"],"id":1,"jsonrpc":"2.0"}'

require "uri"
require "json"
require "net/http"

url = URI("https://docs-demo.solana-mainnet.quiknode.pro/")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = "application/json"
request.body = JSON.dump({
  "method": "simulateTransaction",
  "params": [
    "ENTER_ENCODED_TRANSACTION_ID"
  ],
  "id": 1,
  "jsonrpc": "2.0"
})

response = https.request(request)
puts response.read_body

import {
    createSolanaRpc,
    generateKeyPairSigner,
    lamports,
    pipe,
    createTransactionMessage,
    setTransactionMessageFeePayer,
    setTransactionMessageLifetimeUsingBlockhash,
    appendTransactionMessageInstruction,
    signTransactionMessageWithSigners,
} from "@solana/kit";
import { getTransferSolInstruction } from "@solana-program/system";

const LAMPORTS_PER_SOL = BigInt(1_000_000_000);

(async () => {
    try {
        const solanaRpc = createSolanaRpc("https://docs-demo.solana-mainnet.quiknode.pro/");
        console.log("✅ - Connected to Solana mainnet");

        const fromWallet = await generateKeyPairSigner();
        const toWallet = await generateKeyPairSigner();

        const { value: latestBlockhash } = await solanaRpc.getLatestBlockhash().send();

        const transactionMessage = pipe(
            createTransactionMessage({ version: 0 }),
            tx => setTransactionMessageFeePayer(fromWallet.address, tx),
            tx => setTransactionMessageLifetimeUsingBlockhash(latestBlockhash, tx),
            tx => appendTransactionMessageInstruction(
                getTransferSolInstruction({
                    amount: lamports(LAMPORTS_PER_SOL / BigInt(100)),
                    destination: toWallet.address,
                    source: fromWallet,
                }),
                tx
            )
        );

        const signedTransaction = await signTransactionMessageWithSigners(transactionMessage);

        const simulateResult = await solanaRpc.simulateTransaction(signedTransaction).send();
        console.log('Simulate Transaction Result:', simulateResult);


    } catch (error) {
        console.error('Error occurred:', error);
    }
})();

const web3 = require("@solana/web3.js");

(async () => {
  const solana = new web3.Connection("https://docs-demo.solana-mainnet.quiknode.pro/");

  // Replace with your public/secret keypair, wallet must have funds to pay transaction fees.
  const fromWallet = web3.Keypair.generate();
  const toWallet = web3.Keypair.generate();

  const transaction = new web3.Transaction().add(
    web3.SystemProgram.transfer({
      fromPubkey: fromWallet.publicKey,
      toPubkey: toWallet.publicKey,
      lamports: web3.LAMPORTS_PER_SOL / 100,
    })
  );

  console.log(await solana.simulateTransaction(transaction, [fromWallet]));
})();

from solana.rpc.api import Client
from solana.account import Account
from solana.system_program import TransferParams, transfer
from solana.transaction import Transaction
#Make sure to paste sender, reciever addresses and public key.
solana_client = Client("https://docs-demo.solana-mainnet.quiknode.pro/")
sender, reciever = Account(1), Account(2)
json_request = solana_client.get_recent_blockhash()
recent_blockhash = json_request["result"]["value"]["blockhash"]
txn = Transaction(fee_payer=sender.public_key(), recent_blockhash=recent_blockhash)
txn.add(
    transfer(
        TransferParams(
            from_pubkey=sender.public_key(),
            to_pubkey=reciever.public_key(), 
            lamports=1000
        )
    )
)
txn.sign(sender)
print(solana_client.simulate_transaction(txn))

use reqwest::header;
use reqwest::Client;
use std::error::Error;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let mut headers = header::HeaderMap::new();
    headers.insert("Content-Type", "application/json".parse().unwrap());

    let client = Client::new();
    let json_data = r#"
    {
        "method": "simulateTransaction",
        "params": [
            "ENTER_ENCODED_TRANSACTION_ID"
        ],
        "id": 1,
        "jsonrpc": "2.0"
    }
    "#;
    let response = client
        .post("https://docs-demo.solana-mainnet.quiknode.pro/")
        .headers(headers)
        .body(json_data)
        .send()
        .await?; 

    let body = response.text().await?;
    println!("{}", body);

    Ok(())
}

Response

{
  "jsonrpc": "2.0",
  "result": {
    "context": {
      "slot": 218
    },
    "value": {
      "err": null,
      "accounts": null,
      "logs": [
        "Program 83astBRguLMdt2h5U1Tpdq5tjFoJ6noeGwaY3mDLVcri invoke [1]",
        "Program 83astBRguLMdt2h5U1Tpdq5tjFoJ6noeGwaY3mDLVcri consumed 2366 of 1400000 compute units",
        "Program return: 83astBRguLMdt2h5U1Tpdq5tjFoJ6noeGwaY3mDLVcri KgAAAAAAAAA=",
        "Program 83astBRguLMdt2h5U1Tpdq5tjFoJ6noeGwaY3mDLVcri success"
      ],
      "returnData": {
        "data": [
          "Kg==",
          "base64"
        ],
        "programId": "83astBRguLMdt2h5U1Tpdq5tjFoJ6noeGwaY3mDLVcri"
      },
      "unitsConsumed": 2366
    }
  },
  "id": 1
}

Don't have an account yet?

Create your QuickNode endpoint in seconds and start building

Get started for free