Crypto order book

L2 order-book snapshot for a spot pair: best bid/ask, mid price, spread (absolute + %), and the top N aggregated price levels per side (default 25, max 100). Send GET /api/crypto-orderbook with the required field pair and pay $0.001 per call over x402 or MPP (there is no free tier). It returns a JSON object with pair, time, sequence, bestBid, bestAsk and 8 more.

Pairs use BASE-QUOTE format (BTC-USD, ETH-USD, SOL-USDC). Backed by Coinbase Exchange's public market-data API - keyless; coverage is Coinbase-listed markets.

Category: Crypto & onchain data · Tags: crypto orderbook depth spread trading market-data

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Parameters

Example request

curl -i "https://agent402.tools/api/crypto-orderbook?pair=BTC-USD"

Without payment this returns HTTP 402 Payment Required with the exact price for crypto-orderbook; any x402 v2 or MPP client pays it and retries.

Example response

{
  "pair": "BTC-USD",
  "time": "2026-07-14T02:40:51Z",
  "sequence": 132601080491,
  "bestBid": 62489.29,
  "bestAsk": 62490.01,
  "midPrice": 62489.65,
  "spread": 0.72,
  "spreadPct": 0.0012,
  "bids": [
    {
      "price": 62489.29,
      "size": 0.81109777,
      "orders": 8
    }
  ],
  "asks": [
    {
      "price": 62490.01,
      "size": 0.5,
      "orders": 3
    }
  ],
  "depth": 1,
  "totalBidLevels": 15653,
  "totalAskLevels": 27473
}

From an MCP client

catalog.call {
  "slug": "crypto-orderbook",
  "params": {
    "pair": "BTC-USD"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for crypto-orderbook; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• pair is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A POST with a JSON body to /api/crypto-orderbook is served as this GET, with the body as the input.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

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();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/crypto-orderbook?pair=BTC-USD");

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