# JSON-RPC

The standard way to send transactions through Nozomi. Compatible with any Solana client — just replace your RPC URL with the Nozomi endpoint.

## Request

| Field        | Value                          |
| ------------ | ------------------------------ |
| Method       | `POST`                         |
| Path         | `/?c=<YOUR_API_KEY>`           |
| Content-Type | `application/json`             |
| Encoding     | **base64** (must be specified) |

**Important:** Solana defaults to base58 encoding. You must explicitly set `"encoding": "base64"` or you will get malformed transaction errors.

## Request Body

```json
{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "sendTransaction",
    "params": [
        "<YOUR_BASE_64_ENCODED_TXN_BYTES>",
        { "encoding": "base64" }
    ]
}
```

## Response

Returns the transaction signature as a JSON-RPC result on success.

```json
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": "<TRANSACTION_SIGNATURE>"
}
```

## When to Use

Use JSON-RPC when you want a drop-in replacement for your existing Solana RPC. It returns a transaction signature and works with standard Solana client libraries.

For lower latency in browser clients or performance-sensitive backends, consider [API v2](/nozomi/transaction-submission-api-v2.md) instead.


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