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r="1"></circle></svg>RSS</a></div><article class="mt-8"><header><time dateTime="2026-07-07T14:00:00.000Z" class="text-sm text-fd-muted-foreground">July 7, 2026</time><h1 class="mt-2 text-4xl font-bold">Stop polling: your trading bot is acting on stale prices</h1><p class="mt-3 text-lg text-fd-muted-foreground">Stop polling. How to stream tickers, order books, trades, and your own orders over WebSockets with CCXT — and what the library does for you under the hood.</p><p class="mt-4 border-b pb-6 text-sm text-fd-muted-foreground">By <span class="font-medium text-fd-foreground">CCXT Team</span></p></header><div class="prose mt-8 min-w-0"><div data-state="closed" class="not-prose rounded-lg border bg-fd-card text-fd-card-foreground"><button type="button" aria-expanded="false" data-state="closed" class="group inline-flex w-full items-center justify-between px-4 py-2.5 font-medium">Table of Contents<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-chevron-down size-4 transition-transform duration-200 group-data-[state=open]:rotate-180" aria-hidden="true"><path d="m6 9 6 6 6-6"></path></svg></button><div data-state="closed" id="radix-_R_qav5uiuqivb_" hidden="" class="overflow-hidden"></div></div><p>The first version of every bot polls: call <code>fetchTicker</code> in a loop, sleep, repeat. It works —
until you want more than one symbol, or faster reactions, or you hit the exchange&#x27;s rate
limit. Polling gives you a snapshot per request; markets move between your requests.</p>
<p>Exchanges solve this with WebSocket streams: you subscribe once and the exchange pushes every
update to you. CCXT ships WebSocket support in the same package you already have, in all six
languages, behind an API that mirrors the REST one: where REST has <code>fetchOrderBook</code>,
WebSockets have <code>watchOrderBook</code>.</p>
<h2 id="the-watch-loop" class="group/heading flex scroll-m-28 flex-row items-center gap-1"><a data-card="" href="#the-watch-loop">The watch loop</a><button aria-label="Copy Anchor Link" class="inline-flex items-center justify-center rounded-md text-sm font-medium duration-100 disabled:pointer-events-none disabled:opacity-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-fd-ring hover:bg-fd-accent hover:text-fd-accent-foreground p-1 [&amp;_svg]:size-4 not-prose shrink-0 text-fd-muted-foreground opacity-0 transition-opacity group-hover/heading:opacity-100"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-link" aria-hidden="true"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path></svg></button></h2>
<p>A <code>watch*</code> method resolves every time a new update arrives, so real-time code is just a loop:</p>
<div dir="ltr" data-orientation="horizontal" class="bg-fd-card rounded-xl border my-4"><div role="tablist" aria-orientation="horizontal" class="flex flex-row px-2 overflow-x-auto text-fd-muted-foreground" tabindex="-1" data-orientation="horizontal" style="outline:none"><button type="button" role="tab" aria-selected="true" aria-controls="radix-_R_jaav5uiuqivb_-content-JavaScript" data-state="active" id="radix-_R_jaav5uiuqivb_-trigger-JavaScript" class="relative group inline-flex text-sm font-medium text-nowrap items-center transition-colors gap-2 px-2 py-1.5 hover:text-fd-accent-foreground data-[state=active]:text-fd-primary [&amp;_svg]:size-3.5" tabindex="-1" data-orientation="horizontal" data-radix-collection-item=""><div class="absolute inset-x-2 bottom-0 h-px group-data-[state=active]:bg-fd-primary"></div>JavaScript</button><button type="button" role="tab" aria-selected="false" aria-controls="radix-_R_jaav5uiuqivb_-content-Python" data-state="inactive" 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overflow-hidden text-sm shiki shiki-themes github-light github-dark" style="--shiki-light:#24292e;--shiki-dark:#e1e4e8;--shiki-light-bg:#fff;--shiki-dark-bg:#24292e" tabindex="-1"><div class="empty:hidden absolute top-3 right-2 z-2 backdrop-blur-lg rounded-lg text-fd-muted-foreground"><button type="button" class="inline-flex items-center justify-center rounded-md text-sm font-medium transition-colors duration-100 disabled:pointer-events-none disabled:opacity-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-fd-ring p-1 [&amp;_svg]:size-4 hover:text-fd-accent-foreground data-checked:text-fd-accent-foreground" aria-label="Copy Text"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-clipboard" aria-hidden="true"><rect width="8" height="4" x="8" y="2" rx="1" ry="1"></rect><path d="M16 4h2a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h2"></path></svg></button></div><div role="region" tabindex="0" class="text-[0.8125rem] py-3.5 overflow-auto max-h-[600px] fd-scroll-container focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-fd-ring" style="--padding-right:calc(var(--spacing) * 8)"><pre class="min-w-full w-max *:flex *:flex-col"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8"> ccxt </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF"> &#x27;ccxt&#x27;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">;</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF"> exchange</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583"> new</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8"> ccxt.pro.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0">binance</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">();</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583">while</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8"> (</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF">true</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">) {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583">    const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF"> orderbook</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583"> await</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8"> exchange.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0">watchOrderBook</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF">&#x27;BTC/USDT&#x27;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">    console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">(orderbook.bids[</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF">0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">], orderbook.asks[</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF">0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">]);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">}</span></span></code></pre></div></figure></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_jaav5uiuqivb_-trigger-Python" hidden="" id="radix-_R_jaav5uiuqivb_-content-Python" tabindex="0"></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_jaav5uiuqivb_-trigger-PHP" hidden="" id="radix-_R_jaav5uiuqivb_-content-PHP" tabindex="0"></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_jaav5uiuqivb_-trigger-C#" hidden="" id="radix-_R_jaav5uiuqivb_-content-C#" tabindex="0"></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_jaav5uiuqivb_-trigger-Go" hidden="" id="radix-_R_jaav5uiuqivb_-content-Go" tabindex="0"></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_jaav5uiuqivb_-trigger-Java" hidden="" id="radix-_R_jaav5uiuqivb_-content-Java" tabindex="0"></div></div>
<p>The first call opens the connection and subscribes; every following call just waits for the
next update. The same pattern works for <code>watchTicker</code>, <code>watchTrades</code>, <code>watchOHLCV</code>, and — with
API keys — <code>watchBalance</code>, <code>watchOrders</code>, and <code>watchMyTrades</code> for your own fills.</p>
<h2 id="what-ccxt-does-for-you-under-the-hood" class="group/heading flex scroll-m-28 flex-row items-center gap-1"><a data-card="" href="#what-ccxt-does-for-you-under-the-hood">What CCXT does for you under the hood</a><button aria-label="Copy Anchor Link" class="inline-flex items-center justify-center rounded-md text-sm font-medium duration-100 disabled:pointer-events-none disabled:opacity-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-fd-ring hover:bg-fd-accent hover:text-fd-accent-foreground p-1 [&amp;_svg]:size-4 not-prose shrink-0 text-fd-muted-foreground opacity-0 transition-opacity group-hover/heading:opacity-100"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-link" aria-hidden="true"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path></svg></button></h2>
<p>Raw exchange WebSocket APIs are messy, and this is where most hand-rolled integrations go
wrong. When you call <code>watchOrderBook</code>, CCXT:</p>
<ul>
<li><strong>Maintains the book from deltas.</strong> Most exchanges send an initial snapshot and then
incremental updates. CCXT applies them in order, checks sequence numbers, and hands you a
complete, sorted order book every time — not a raw diff message.</li>
<li><strong>Manages connections.</strong> One WebSocket per stream group, shared across your subscriptions.
Subscribe to fifty symbols and CCXT multiplexes them properly for that exchange.</li>
<li><strong>Reconnects and resubscribes.</strong> Exchanges drop connections routinely (Binance, for
example, cuts every connection after 24 hours). CCXT reconnects, re-authenticates, and
re-subscribes automatically; your loop just keeps receiving updates.</li>
<li><strong>Handles keepalives</strong> — ping/pong frames, heartbeat messages, and the exchange-specific
quirks you&#x27;d otherwise discover at 3 a.m.</li>
</ul>
<h2 id="many-symbols-many-exchanges" class="group/heading flex scroll-m-28 flex-row items-center gap-1"><a data-card="" href="#many-symbols-many-exchanges">Many symbols, many exchanges</a><button aria-label="Copy Anchor Link" class="inline-flex items-center justify-center rounded-md text-sm font-medium duration-100 disabled:pointer-events-none disabled:opacity-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-fd-ring hover:bg-fd-accent hover:text-fd-accent-foreground p-1 [&amp;_svg]:size-4 not-prose shrink-0 text-fd-muted-foreground opacity-0 transition-opacity group-hover/heading:opacity-100"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-link" aria-hidden="true"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path></svg></button></h2>
<p>For dashboards, scanners, and market making you rarely want a single stream. <code>watchTickers</code>
subscribes to a list of symbols in one shot and returns a structure keyed by symbol, updated
as events arrive:</p>
<div dir="ltr" data-orientation="horizontal" class="bg-fd-card rounded-xl border my-4"><div role="tablist" aria-orientation="horizontal" class="flex flex-row px-2 overflow-x-auto text-fd-muted-foreground" tabindex="-1" data-orientation="horizontal" style="outline:none"><button type="button" role="tab" aria-selected="true" aria-controls="radix-_R_1faav5uiuqivb_-content-JavaScript" data-state="active" id="radix-_R_1faav5uiuqivb_-trigger-JavaScript" class="relative group inline-flex text-sm font-medium text-nowrap items-center transition-colors gap-2 px-2 py-1.5 hover:text-fd-accent-foreground data-[state=active]:text-fd-primary [&amp;_svg]:size-3.5" tabindex="-1" data-orientation="horizontal" data-radix-collection-item=""><div class="absolute inset-x-2 bottom-0 h-px group-data-[state=active]:bg-fd-primary"></div>JavaScript</button><button type="button" role="tab" aria-selected="false" aria-controls="radix-_R_1faav5uiuqivb_-content-Python" data-state="inactive" 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overflow-hidden text-sm shiki shiki-themes github-light github-dark" style="--shiki-light:#24292e;--shiki-dark:#e1e4e8;--shiki-light-bg:#fff;--shiki-dark-bg:#24292e" tabindex="-1"><div class="empty:hidden absolute top-3 right-2 z-2 backdrop-blur-lg rounded-lg text-fd-muted-foreground"><button type="button" class="inline-flex items-center justify-center rounded-md text-sm font-medium transition-colors duration-100 disabled:pointer-events-none disabled:opacity-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-fd-ring p-1 [&amp;_svg]:size-4 hover:text-fd-accent-foreground data-checked:text-fd-accent-foreground" aria-label="Copy Text"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-clipboard" aria-hidden="true"><rect width="8" height="4" x="8" y="2" rx="1" ry="1"></rect><path d="M16 4h2a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h2"></path></svg></button></div><div role="region" tabindex="0" class="text-[0.8125rem] py-3.5 overflow-auto max-h-[600px] fd-scroll-container focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-fd-ring" style="--padding-right:calc(var(--spacing) * 8)"><pre class="min-w-full w-max *:flex *:flex-col"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF"> symbols</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8"> [</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF">&#x27;BTC/USDT&#x27;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF">&#x27;ETH/USDT&#x27;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF">&#x27;SOL/USDT&#x27;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">];</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583">while</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8"> (</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF">true</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">) {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583">    const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF"> tickers</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583"> await</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8"> exchange.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0">watchTickers</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">(symbols);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">    console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">(tickers[</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF">&#x27;BTC/USDT&#x27;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">].last);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">}</span></span></code></pre></div></figure></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_1faav5uiuqivb_-trigger-Python" hidden="" id="radix-_R_1faav5uiuqivb_-content-Python" tabindex="0"></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_1faav5uiuqivb_-trigger-PHP" hidden="" id="radix-_R_1faav5uiuqivb_-content-PHP" tabindex="0"></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_1faav5uiuqivb_-trigger-C#" hidden="" id="radix-_R_1faav5uiuqivb_-content-C#" tabindex="0"></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_1faav5uiuqivb_-trigger-Go" hidden="" id="radix-_R_1faav5uiuqivb_-content-Go" tabindex="0"></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_1faav5uiuqivb_-trigger-Java" hidden="" id="radix-_R_1faav5uiuqivb_-content-Java" tabindex="0"></div></div>
<p>There are <code>...ForSymbols</code> variants (<code>watchTradesForSymbols</code>, <code>watchOrderBookForSymbols</code>,
<code>watchOHLCVForSymbols</code>) when you need one loop over many markets, and running several
exchanges concurrently is just multiple loops — one async task per exchange in
JavaScript/Python/PHP/C#/Java, one goroutine per exchange in Go.</p>
<h2 id="watching-your-own-orders" class="group/heading flex scroll-m-28 flex-row items-center gap-1"><a data-card="" href="#watching-your-own-orders">Watching your own orders</a><button aria-label="Copy Anchor Link" class="inline-flex items-center justify-center rounded-md text-sm font-medium duration-100 disabled:pointer-events-none disabled:opacity-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-fd-ring hover:bg-fd-accent hover:text-fd-accent-foreground p-1 [&amp;_svg]:size-4 not-prose shrink-0 text-fd-muted-foreground opacity-0 transition-opacity group-hover/heading:opacity-100"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-link" aria-hidden="true"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path></svg></button></h2>
<p>The same mechanism covers private data, which is how bots track fills without polling
<code>fetchOrder</code>:</p>
<div dir="ltr" data-orientation="horizontal" class="bg-fd-card rounded-xl border my-4"><div role="tablist" aria-orientation="horizontal" class="flex flex-row px-2 overflow-x-auto text-fd-muted-foreground" tabindex="-1" data-orientation="horizontal" style="outline:none"><button type="button" role="tab" aria-selected="true" aria-controls="radix-_R_1vaav5uiuqivb_-content-JavaScript" data-state="active" id="radix-_R_1vaav5uiuqivb_-trigger-JavaScript" class="relative group inline-flex text-sm font-medium text-nowrap items-center transition-colors gap-2 px-2 py-1.5 hover:text-fd-accent-foreground data-[state=active]:text-fd-primary [&amp;_svg]:size-3.5" tabindex="-1" data-orientation="horizontal" data-radix-collection-item=""><div class="absolute inset-x-2 bottom-0 h-px group-data-[state=active]:bg-fd-primary"></div>JavaScript</button><button type="button" role="tab" aria-selected="false" aria-controls="radix-_R_1vaav5uiuqivb_-content-Python" data-state="inactive" 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overflow-hidden text-sm shiki shiki-themes github-light github-dark" style="--shiki-light:#24292e;--shiki-dark:#e1e4e8;--shiki-light-bg:#fff;--shiki-dark-bg:#24292e" tabindex="-1"><div class="empty:hidden absolute top-3 right-2 z-2 backdrop-blur-lg rounded-lg text-fd-muted-foreground"><button type="button" class="inline-flex items-center justify-center rounded-md text-sm font-medium transition-colors duration-100 disabled:pointer-events-none disabled:opacity-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-fd-ring p-1 [&amp;_svg]:size-4 hover:text-fd-accent-foreground data-checked:text-fd-accent-foreground" aria-label="Copy Text"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-clipboard" aria-hidden="true"><rect width="8" height="4" x="8" y="2" rx="1" ry="1"></rect><path d="M16 4h2a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h2"></path></svg></button></div><div role="region" tabindex="0" class="text-[0.8125rem] py-3.5 overflow-auto max-h-[600px] fd-scroll-container focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-fd-ring" style="--padding-right:calc(var(--spacing) * 8)"><pre class="min-w-full w-max *:flex *:flex-col"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF"> exchange</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583"> new</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8"> ccxt.pro.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0">binance</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">({ apiKey: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF">KEY</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">, secret: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF">SECRET</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8"> });</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583">while</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8"> (</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF">true</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">) {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583">    const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF"> orders</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583"> =</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583"> await</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8"> exchange.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0">watchOrders</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">();</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583">    for</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8"> (</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF"> order</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583"> of</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8"> orders) {</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">        console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">(order.id, order.status, order.filled);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">    }</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8">}</span></span></code></pre></div></figure></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_1vaav5uiuqivb_-trigger-Python" hidden="" id="radix-_R_1vaav5uiuqivb_-content-Python" tabindex="0"></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_1vaav5uiuqivb_-trigger-PHP" hidden="" id="radix-_R_1vaav5uiuqivb_-content-PHP" tabindex="0"></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_1vaav5uiuqivb_-trigger-C#" hidden="" id="radix-_R_1vaav5uiuqivb_-content-C#" tabindex="0"></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_1vaav5uiuqivb_-trigger-Go" hidden="" id="radix-_R_1vaav5uiuqivb_-content-Go" tabindex="0"></div><div data-state="inactive" data-orientation="horizontal" role="tabpanel" aria-labelledby="radix-_R_1vaav5uiuqivb_-trigger-Java" hidden="" id="radix-_R_1vaav5uiuqivb_-content-Java" tabindex="0"></div></div>
<h2 id="practical-notes" class="group/heading flex scroll-m-28 flex-row items-center gap-1"><a data-card="" href="#practical-notes">Practical notes</a><button aria-label="Copy Anchor Link" class="inline-flex items-center justify-center rounded-md text-sm font-medium duration-100 disabled:pointer-events-none disabled:opacity-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-fd-ring hover:bg-fd-accent hover:text-fd-accent-foreground p-1 [&amp;_svg]:size-4 not-prose shrink-0 text-fd-muted-foreground opacity-0 transition-opacity group-hover/heading:opacity-100"><svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="lucide lucide-link" aria-hidden="true"><path d="M10 13a5 5 0 0 0 7.54.54l3-3a5 5 0 0 0-7.07-7.07l-1.72 1.71"></path><path d="M14 11a5 5 0 0 0-7.54-.54l-3 3a5 5 0 0 0 7.07 7.07l1.71-1.71"></path></svg></button></h2>
<ul>
<li><strong>Check support first.</strong> Not every exchange implements every stream. Capability flags tell
you at runtime: <code>exchange.has[&#x27;watchOrderBook&#x27;]</code>, <code>exchange.has[&#x27;watchOrders&#x27;]</code>, and so on.</li>
<li><strong>Always <code>close()</code> on shutdown.</strong> WebSocket connections hold sockets and background tasks;
call <code>await exchange.close()</code> when your program exits.</li>
<li><strong>REST still has a job.</strong> Placing and canceling orders, fetching history, and one-shot
queries are REST&#x27;s territory. The standard architecture is: WebSockets for state you watch
(prices, books, fills), REST for actions you take.</li>
<li><strong>Throughput beats latency for most people.</strong> The realistic win of WebSockets is not
microseconds — it&#x27;s watching hundreds of markets simultaneously without touching a rate
limit, which is simply impossible with polling.</li>
</ul>
<p>If you&#x27;re building toward strategies that need this — scanners, market making — the follow-up
posts pick up exactly here: <a href="/blog/crypto-arbitrage-strategies">arbitrage strategies</a> and
<a href="/blog/market-making-with-ccxt">market making</a>.</p></div></article></main><!--$--><!--/$--></main><footer class="mt-auto border-t py-6 text-sm text-fd-muted-foreground"><div class="mx-auto flex w-full max-w-5xl items-center justify-center px-4"><p>© <!-- -->2026<!-- --> CCXT ·<!-- --> <a class="transition-colors hover:text-fd-foreground" href="/about-us">About</a> <!-- -->·<!-- --> <a class="transition-colors hover:text-fd-foreground" href="/contact">Contact</a></p></div></footer><script src="/_next/static/chunks/28flaeabfo316.js" id="_R_" 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