GET /orderbook/:instrument_name

Aggregated order book (open and partially filled orders).

GEThttps://arc-testnet-api.realtime.exchange/orderbook/{instrument_name}Server network

No authentication

Path parameters

instrument_namestringrequired

Instrument name, e.g. BTC-PERP, or its 0x id.

Response

200

{bids: [{price, amount, orders}], asks: [...], last_updated_timestamp, checksum}

price and amount are raw on-chain integers as strings. Divide price by 10^quote_decimals and amount by 10^base_decimals from GET /markets to get human values.
At most 500 orders per side are read before aggregation.
checksum is the server time in hex, not a checksum of the book. last_updated_timestamp is the response time in milliseconds.
Unknown instrument → 404.

GET /orderbook/{instrument_name}Language

curl "https://arc-testnet-api.realtime.exchange/orderbook/AAPL-PERP"

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	req, err := http.NewRequest("GET", "https://arc-testnet-api.realtime.exchange/orderbook/AAPL-PERP", nil)
	if err != nil {
		panic(err)
	}
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	data, _ := io.ReadAll(res.Body)
	fmt.Println(res.StatusCode, string(data))
}

<?php
$ch = curl_init('https://arc-testnet-api.realtime.exchange/orderbook/AAPL-PERP');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
]);
$response = curl_exec($ch);
echo curl_getinfo($ch, CURLINFO_HTTP_CODE), ' ', $response, PHP_EOL;

Response

{
  "asks": [],
  "bids": [],
  "checksum": "1a0e7e14859",
  "last_updated_timestamp": "1790596696153"
}

Real response to GET /orderbook/AAPL-PERP from arc-testnet-api.realtime.exchange. Addresses and hashes are replaced by placeholders.