simulateTransaction

curl https://fra.rpc.orbitflare.com?api_key=YOUR-API-KEY -X POST -H "Content-Type: application/json" -d '{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "simulateTransaction",
  "params": [
    "4hXTCkRzt9WyecNzV1XPgCDfGAZzQKNxLXgynz5QDuWWPSAZBZSHptvWRL3BjCvzUXRdKvHL2b7yGrRQcWyaqsaBCncVG7BFggS8w9snUts67BSh3EqKpXLUm5UMHfD7ZBe9GhARjbNQMLJ1QD3Spr6oMTFNhyKNMr3WNFCrXgDS7uV7u",
    {
      "sigVerify": false,
      "commitment": "confirmed",
      "encoding": "base64"
    }
  ]
}'

import { Connection, Transaction, PublicKey, SystemProgram } from '@solana/web3.js';

const connection = new Connection('https://fra.rpc.orbitflare.com?api_key=YOUR-API-KEY');

// Create and simulate transaction
const transaction = new Transaction().add(
  SystemProgram.transfer({
    fromPubkey: new PublicKey('83astBRguLMdt2h5U1Tpdq5tjFoJ6noeGwaY3mDLVcri'),
    toPubkey: new PublicKey('J7rBdM6AecPDEZp8aPq5tPmsPzPhQG4HD6YtAcQBDfJj'),
    lamports: 1000000000
  })
);

const simulation = await connection.simulateTransaction(transaction);
console.log('Simulation result:', simulation);