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

# L4 Order Book

> Full depth order book with individual orders and wallet addresses

<Note>
  **Exclusive to hypernode.** The public HyperLiquid API only provides L2 order books (top 20 aggregated price levels, no addresses). hypernode gives you **L4**: every individual resting order on every market, with the wallet address that placed it.
</Note>

## What is L4?

| Level               | What you see                                                             | Source                |
| ------------------- | ------------------------------------------------------------------------ | --------------------- |
| **L2** (public API) | Top 20 price levels, aggregated sizes, no addresses                      | `api.hyperliquid.xyz` |
| **L4** (hypernode)  | Every individual order: price, size, wallet address, order ID, timestamp | hypernode             |

## Why it matters

* **See who is providing liquidity** at every price level
* **Track specific wallets** across their entire order book
* **Detect spoofing** — large orders placed and pulled
* **Measure real depth** — not just aggregated levels but individual order sizes
* **Build your own L2/L3** by aggregating L4 data however you want

## Scale

On mainnet right now:

* **699 markets** with L4 data
* **380,000–400,000 individual orders** across all markets
* **BTC alone: \~33,000 bids, \~15,000 asks (\~48,000 total)**
* **Refreshed every second** from our local node
* **Cached** — responses served instantly, no per-request computation

## Endpoints

| Endpoint                                     | Description                   | Rate limit        |
| -------------------------------------------- | ----------------------------- | ----------------- |
| [`GET /v2/l4book?coin=BTC`](/rest/l4/book)   | Full L4 book for one asset    | Per-tier L4 limit |
| [`GET /v2/l4book/summary`](/rest/l4/summary) | All markets with order counts | Per-tier L4 limit |

## Quick example

```bash theme={null}
curl -H "x-api-key: YOUR_KEY" \
  "https://hyper.polynode.dev/v2/l4book?coin=BTC"
```

Each order in the response:

```json theme={null}
{
  "user": "0xcde682fc64f38967b71cfd00803d4ba3d60e49d1",
  "coin": "ETH",
  "side": "A",
  "limitPx": "2385.5",
  "sz": "3.6932",
  "oid": 380856822611,
  "orderType": "Limit",
  "tif": "Alo",
  "timestamp": 1776156995426,
  "reduceOnly": false
}
```

Every field you need: who placed it, at what price, what size, when, and whether it is reduce-only or a trigger order.

## Rate limits

L4 data has its own rate limit, separate from general REST queries:

| Tier       | L4 queries/sec | Price    |
| ---------- | -------------- | -------- |
| free       | 0 (blocked)    | \$0      |
| starter    | 1              | \$50/mo  |
| growth     | 5              | \$200/mo |
| pro        | 20             | custom   |
| enterprise | 100            | \$750/mo |

## Authentication

Same API keys as all hypernode endpoints. Pass via `x-api-key` header or `?key=` query parameter.

[Sign up at polynode.dev](https://polynode.dev) — Growth plan and above includes L4 access.