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

# simulateTransaction on Solana

> simulateTransaction simulates sending a transaction without submitting it on Solana, via GoldRush JSON-RPC.

> [card] 0.01 credits per call

`simulateTransaction` on **Solana**: Simulates sending a transaction without submitting it.

## Endpoint

```
https://rpc.goldrushdata.com/v1/solana-mainnet
```

Authenticate with `Authorization: Bearer <GOLDRUSH_API_KEY>`. See [authentication](https://goldrush.dev/docs/goldrush-json-rpc/authentication.md).

## Parameters

| Name | Type | Required | Description | Example |
| - | - | - | - | - |
| `transaction` | `string` | yes | Transaction to simulate, `base64` or `base58` encoded. May be unsigned when `sigVerify` is false. | `"AR4KbO6uYPS5PKSh8u1ah2Jq1pHeXwaojuxdDGbSSumHcCM1bukbYaDt5/wiqiIwP156mLvzJxk3ILQocD3W8wcBAAIEwS6EMxyDU3PzY4L5Q52OIthyvkPczZiNOrY0kYo1V1oNwwgfIhv6odn2qTUu/gOisDtaeCW1qlwW/gx3ccr/4wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAwZGb+UhFzL/7K26csOb57yM5bvF9xJrLEObOkAAAACmNAYg3PP4Wwb6+EaGmhEew4gOOjQBZwBCR73i+EDMaAMDAAkDgNHwCAAAAAADAAUC9AEAAAICAAEMAgAAAKCGAQAAAAAA"` |
| `config` | `object` | no | `{encoding?, sigVerify?, replaceRecentBlockhash?, commitment?, accounts?, minContextSlot?}`. `accounts` requests post-simulation account state. | `{"encoding":"base64","sigVerify":false,"replaceRecentBlockhash":true,"commitment":"confirmed"}` |

## Returns

`object`: `{context, value: {err, logs, accounts, unitsConsumed, returnData}}`.

```json theme={null}
{"context":{"slot":372877175},"value":{"err":null,"logs":["Program 11111111111111111111111111111111 invoke [1]"],"unitsConsumed":2100}}
```

## Examples

```bash curl theme={null}
curl https://rpc.goldrushdata.com/v1/solana-mainnet \
  -H "Authorization: Bearer $GOLDRUSH_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "simulateTransaction",
    "params": ["AR4KbO6uYPS5PKSh8u1ah2Jq1pHeXwaojuxdDGbSSumHcCM1bukbYaDt5/wiqiIwP156mLvzJxk3ILQocD3W8wcBAAIEwS6EMxyDU3PzY4L5Q52OIthyvkPczZiNOrY0kYo1V1oNwwgfIhv6odn2qTUu/gOisDtaeCW1qlwW/gx3ccr/4wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAwZGb+UhFzL/7K26csOb57yM5bvF9xJrLEObOkAAAACmNAYg3PP4Wwb6+EaGmhEew4gOOjQBZwBCR73i+EDMaAMDAAkDgNHwCAAAAAADAAUC9AEAAAICAAEMAgAAAKCGAQAAAAAA", {"encoding":"base64","sigVerify":false,"replaceRecentBlockhash":true,"commitment":"confirmed"}]
  }'
```

```typescript @solana/kit theme={null}
import {
  createDefaultRpcTransport,
  createSolanaRpcFromTransport,
} from "@solana/kit";

const transport = createDefaultRpcTransport({
  url: "https://rpc.goldrushdata.com/v1/solana-mainnet",
  headers: { Authorization: `Bearer ${process.env.GOLDRUSH_API_KEY}` },
});
const rpc = createSolanaRpcFromTransport(transport);

const result = await rpc.simulateTransaction("AR4KbO6uYPS5PKSh8u1ah2Jq1pHeXwaojuxdDGbSSumHcCM1bukbYaDt5/wiqiIwP156mLvzJxk3ILQocD3W8wcBAAIEwS6EMxyDU3PzY4L5Q52OIthyvkPczZiNOrY0kYo1V1oNwwgfIhv6odn2qTUu/gOisDtaeCW1qlwW/gx3ccr/4wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAwZGb+UhFzL/7K26csOb57yM5bvF9xJrLEObOkAAAACmNAYg3PP4Wwb6+EaGmhEew4gOOjQBZwBCR73i+EDMaAMDAAkDgNHwCAAAAAADAAUC9AEAAAICAAEMAgAAAKCGAQAAAAAA", {"encoding":"base64","sigVerify":false,"replaceRecentBlockhash":true,"commitment":"confirmed"}).send();
console.log(result);
```

```python python theme={null}
import os
import requests

resp = requests.post(
    "https://rpc.goldrushdata.com/v1/solana-mainnet",
    headers={
        "Authorization": f"Bearer {os.environ['GOLDRUSH_API_KEY']}",
        "Content-Type": "application/json",
    },
    json={"jsonrpc": "2.0", "id": 1, "method": "simulateTransaction", "params": ["AR4KbO6uYPS5PKSh8u1ah2Jq1pHeXwaojuxdDGbSSumHcCM1bukbYaDt5/wiqiIwP156mLvzJxk3ILQocD3W8wcBAAIEwS6EMxyDU3PzY4L5Q52OIthyvkPczZiNOrY0kYo1V1oNwwgfIhv6odn2qTUu/gOisDtaeCW1qlwW/gx3ccr/4wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAwZGb+UhFzL/7K26csOb57yM5bvF9xJrLEObOkAAAACmNAYg3PP4Wwb6+EaGmhEew4gOOjQBZwBCR73i+EDMaAMDAAkDgNHwCAAAAAADAAUC9AEAAAICAAEMAgAAAKCGAQAAAAAA", {"encoding":"base64","sigVerify":false,"replaceRecentBlockhash":true,"commitment":"confirmed"}]},
)
print(resp.json()["result"])
```

## Errors

Standard JSON-RPC errors: `-32600` invalid request, `-32601` method not found, `-32602` invalid params.

## Related Transactions info methods on Solana

* [`getTransaction` on Solana](https://goldrush.dev/docs/api-reference/json-rpc/solana/gettransaction)
* [`sendTransaction` on Solana](https://goldrush.dev/docs/api-reference/json-rpc/solana/sendtransaction)
* [`getSignaturesForAddress` on Solana](https://goldrush.dev/docs/api-reference/json-rpc/solana/getsignaturesforaddress)
* [`getSignatureStatuses` on Solana](https://goldrush.dev/docs/api-reference/json-rpc/solana/getsignaturestatuses)
* [`getTransactionCount` on Solana](https://goldrush.dev/docs/api-reference/json-rpc/solana/gettransactioncount)


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