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

# RPC Proxy

> JSON-RPC calls through PolyNode's optimized Polygon RPC endpoint

Both SDKs include a method to send JSON-RPC requests through `rpc.polynode.dev`. Transaction submission goes directly to the current block-producing validator for optimal inclusion. Read calls are served from our P2P infrastructure.

## Usage

<Tabs>
  <Tab title="TypeScript">
    ```typescript theme={null}
    // Block number (served locally, no external call)
    const blockNum = await pn.rpc('eth_blockNumber');

    // Gas price (from PolyNode's gas oracle)
    const gasPrice = await pn.rpc('eth_gasPrice');

    // Read calls (proxied to public RPC)
    const balance = await pn.rpc('eth_getBalance', ['0xabc...', 'latest']);
    const block = await pn.rpc('eth_getBlockByNumber', ['latest', false]);
    ```
  </Tab>

  <Tab title="Rust">
    ```rust theme={null}
    let block_num = client.rpc_call("eth_blockNumber", serde_json::json!([])).await?;
    let gas_price = client.rpc_call("eth_gasPrice", serde_json::json!([])).await?;
    let balance = client.rpc_call("eth_getBalance",
        serde_json::json!(["0xabc...", "latest"])).await?;
    ```
  </Tab>
</Tabs>

See the [RPC documentation](/rpc/overview) for the full list of supported methods and limitations.