Perp order book

Level-2 order book for one perpetual: best bid/ask, mid, spread (absolute and bps), up to 20 levels per side with size and order count, cumulative depth in coins and USD on each side, and the bid/ask imbalance within the requested depth. Hyperliquid public data, no key.

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Input

Example output

{
  "source": "hyperliquid",
  "coin": "BTC",
  "time": "2026-08-22T12:00:00.000Z",
  "bestBid": 77279,
  "bestAsk": 77280,
  "mid": 77279.5,
  "spread": 1,
  "spreadBps": 0.129,
  "bids": [
    {
      "px": 77279,
      "sz": 3.13,
      "n": 10
    }
  ],
  "asks": [
    {
      "px": 77280,
      "sz": 1.2,
      "n": 4
    }
  ],
  "bidDepth": {
    "levels": 5,
    "size": 6.1,
    "notionalUsd": 471000
  },
  "askDepth": {
    "levels": 5,
    "size": 4.2,
    "notionalUsd": 324000
  },
  "imbalance": 0.185,
  "fetchedAt": "2026-08-22T12:00:00.000Z"
}

Try it - see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/perp-orderbook \
  -H "Content-Type: application/json" \
  -d '{"coin":"BTC","depth":5}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/perp-orderbook", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "coin": "BTC",
    "depth": 5
  }),
});

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