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Last updated on January 1, 1970

3 min read

Method simulateTransaction Solana (SOL)
connect with JSON-RPC protocol



Simulate sending a transaction


transaction - string

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

Config - object


Configuration object containing the following fields: - sigVerify: bool - if true the transaction signatures will be verified (default: false, conflicts with replaceRecentBlockhash) - commitment: string (optional) - Commitment level to simulate the transaction at (default: "finalized"). - encoding: string (optional) - Encoding used for the transaction data. Either "base58" (slow, DEPRECATED), or "base64". (default: "base58"). - replaceRecentBlockhash: bool (optional) - if true the transaction recent blockhash will be replaced with the most recent blockhash. (default: false, conflicts with sigVerify) - accounts: object (optional) - Accounts configuration object containing the following fields: - encoding: string (optional) - encoding for returned Account data, either "base64" (default), "base64+zstd" or "jsonParsed". "jsonParsed" encoding attempts to use program-specific state parsers to return more human-readable and explicit account state data. If "jsonParsed" is requested but a parser cannot be found, the field falls back to binary encoding, detectable when the data field is type string. - addresses: array - an array of accounts to return, as base-58 encoded strings


curl --location --request POST '' \ 
--header 'x-api-key: YOUR-API-KEY' \ 
--header 'Content-Type: application/json' \ 
--data-raw '{"jsonrpc": "2.0",
"method": "simulateTransaction",
"params": ["4hXTCkRzt9WyecNzV1XPgCDfGAZzQKNxLXgynz5QDuWWPSAZBZSHptvWRL3BjCvzUXRdKvHL2b7yGrRQcWyaqsaBCncVG7BFggS8w9snUts67BSh3EqKpXLUm5UMHfD7ZBe9GhARjbNQMLJ1QD3Spr6oMTBU6EhdB4RD8CP2xUxr2u3d6fos36PD98XS6oX8TQjLpsMwncs5DAMiD4nNnR8NBfyghGCWvCVifVwvA8B8TJxE1aiyiv2L429BCWfyzAme5sZW8rDb14NeCQHhZbtNqfXhcp2tAnaAT", null],
"id": ""}'


    "id": "",
    "jsonrpc": "2.0",
    "result": {
        "context": {
            "slot": 123032941
        "value": {
            "accounts": null,
            "err": "BlockhashNotFound",
            "logs": []
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