# Robinhood RPC & WebSocket

> Standard Ethereum JSON-RPC and WebSocket on Robinhood Chain (Arbitrum L2, chain ID 4663): HTTPS and WSS endpoints, x-token auth, debug tracing, logs from genesis. Backend use, token in a header.

Robinhood Chain is an Ethereum-compatible **Arbitrum Layer 2**, chain ID `4663`, using ETH for gas. Our node speaks standard Ethereum JSON-RPC over HTTPS and `eth_subscribe` over WebSocket, so ethers, viem and web3.py work after you change the URL and add one header.

<Note>
**Token auth, one header.** Send your token as `x-token` on every HTTPS request and on the WebSocket handshake. Nothing else is accepted: `Authorization: Bearer`, `x-api-key` and a token in the URL all return `401`.
</Note>

## Endpoints

| Transport | URL |
|---|---|
| HTTPS JSON-RPC | `https://ny01.rh.supanode.xyz:8545` |
| WebSocket | `wss://ny01.rh.supanode.xyz:8546` |

US East (New York). TLS only: plain `http://` is not served. Keep the port in the URL, it is required. One token covers both transports.

## What you get

- **Standard Ethereum JSON-RPC:** `eth_*`, `net_version`, `web3_clientVersion`, filters, `eth_simulateV1`, `eth_getProof`, batch requests up to 1,000 calls.
- **Debug tracing:** `debug_traceTransaction`, `debug_traceBlockByNumber`, `debug_traceBlockByHash`, `debug_traceCall` with `callTracer` and `prestateTracer`, plus `debug_getRaw*`.
- **WebSocket subscriptions:** `newHeads` at the chain's ~10 blocks per second, and `logs` filtered by address and topics. Plain JSON-RPC calls work on the same connection.
- **Full history of blocks, transactions, receipts and logs** since the chain started on 30 April 2026.
- **Recent state:** `eth_call`, `eth_getBalance` and `eth_getStorageAt` at a past block reach back about 5 days. See [What's available](https://supanode.xyz/docs/robinhood/rpc/whats-available#history-depth).
- **Latency:** the node adds 1-7 ms on top of network round-trip time.

<Warning>
**Server-side only for now.** A browser cannot send the `x-token` header on a WebSocket handshake, and the HTTPS endpoint does not answer CORS preflight requests. Call the node from your backend and serve your frontend from there.
</Warning>

## Quick check

```bash
curl -s https://ny01.rh.supanode.xyz:8545 \
  -H "x-token: YOUR_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_chainId","params":[]}'
```

Expected answer: `{"jsonrpc":"2.0","id":1,"result":"0x1237"}` (`0x1237` is 4663). The `Content-Type: application/json` header is mandatory: without it the node returns `415`.

## Errors you may see

| Response | Meaning |
|---|---|
| `401` `{"error": "Header x-token is missing"}` | No `x-token` header. Bearer, `x-api-key` and URL tokens land here too. |
| `403` `{"error": "Invalid x-token"}` | The header is there, the token is not valid. |
| `415` `invalid content type, only application/json is supported` | `Content-Type: application/json` is missing. |

These errors come from the gateway, not the node: `401` and `403` are plain JSON without `jsonrpc` or `id`, and `415` is plain text.

## Pricing

**$389 / mo**, flat, one token for HTTPS and WebSocket. Crypto-only, monthly and prepaid. See [Robinhood pricing](https://supanode.xyz/docs/robinhood/pricing).

## Free trial

**24 hours, no card.** Start it in the portal before you subscribe.

## Getting access

Start in the [portal](https://stg.portal.supanode.xyz), signed in with a Solana wallet, and you get your token. Questions? [Telegram support](https://telegram.me/supanode_tgs).

## Where to next

<CardGroup cols={2}>
  <Card title="What's available" icon="list" href="https://supanode.xyz/docs/robinhood/rpc/whats-available">
    Methods, subscriptions, history depth and Arbitrum specifics.
  </Card>
  <Card title="Limits" icon="gauge" href="https://supanode.xyz/docs/robinhood/rpc/limits">
    Batches, timeouts, eth_getLogs ranges, connection habits.
  </Card>
  <Card title="Examples" icon="code" href="https://supanode.xyz/docs/robinhood/rpc/examples">
    curl, ethers, viem, web3.py and wscat, all run against the node.
  </Card>
  <Card title="Indexer" icon="database" href="https://supanode.xyz/docs/robinhood/indexer">
    Decoded Uniswap and launchpad history in SQL.
  </Card>
</CardGroup>