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href="/docs/v5/event/websocket/public/orderbook">Event Trading</a></div></li></ul></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="/docs/v5/rate-limit">Rate Limit</a></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/v5/enum">Enums Definitions</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/docs/v5/error">Error Codes</a></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="/docs/v5/abandon/asset-info">Abandoned Endpoints</a></div></li></ul></nav><button type="button" title="Collapse sidebar" aria-label="Collapse sidebar" class="button button--secondary button--outline collapseSidebarButton_PEFL"><svg width="20" height="20" aria-hidden="true" class="collapseSidebarButtonIcon_kv0_"><g fill="#7a7a7a"><path d="M9.992 10.023c0 .2-.062.399-.172.547l-4.996 7.492a.982.982 0 01-.828.454H1c-.55 0-1-.453-1-1 0-.2.059-.403.168-.551l4.629-6.942L.168 3.078A.939.939 0 010 2.528c0-.548.45-.997 1-.997h2.996c.352 0 .649.18.828.45L9.82 9.472c.11.148.172.347.172.55zm0 0"></path><path d="M19.98 10.023c0 .2-.058.399-.168.547l-4.996 7.492a.987.987 0 01-.828.454h-3c-.547 0-.996-.453-.996-1 0-.2.059-.403.168-.551l4.625-6.942-4.625-6.945a.939.939 0 01-.168-.55 1 1 0 01.996-.997h3c.348 0 .649.18.828.45l4.996 7.492c.11.148.168.347.168.55zm0 0"></path></g></svg></button></div></aside><main class="docMainContainer_gTbr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_BDYx"><div class="docItemContainer_oq1c"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/docs/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_OVgt"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">WebSocket Stream</span><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Public</span><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Orderbook</span><meta itemprop="position" content="3"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_VWUt"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown theme-api-markdown markdown"><header><h1>Orderbook</h1></header><div class="row"><div class="col col--12"><p>Subscribe to the orderbook stream. Supports different depths.</p><div class="theme-admonition theme-admonition-info alert alert--info admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>info</div><div class="admonitionContent_S0QG"><p><a href="https://www.bybit.com/en/help-center/article/Retail-Price-Improvement-RPI-Order" target="_blank" rel="noopener noreferrer">Retail Price Improvement (RPI)</a> orders will not be included in the messages.</p></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="depths">Depths<a class="hash-link" href="#depths" title="Direct link to heading">​</a></h3><p><strong>Linear &amp; inverse:</strong><br>
Level 1 data, push frequency: <strong>10ms</strong><br>
Level 50 data, push frequency: <strong>20ms</strong><br>
Level 200 data, push frequency: <strong>100ms</strong><br>
Level 1000 data, push frequency: <strong>200ms</strong><br></p><p><strong>Spot:</strong><br>
Level 1 data, push frequency: <strong>10ms</strong><br>
Level 50 data, push frequency: <strong>20ms</strong><br>
Level 200 data, push frequency: <strong>100ms</strong><br>
Level 1000 data, push frequency: <strong>200ms</strong><br></p><p><strong>Option:</strong><br>
Level 25 data, push frequency: <strong>20ms</strong><br>
Level 100 data, push frequency: <strong>100ms</strong><br></p><p><strong>Topic:</strong><br>
<code>orderbook.{depth}.{symbol}</code> e.g., orderbook.1.BTCUSDT</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="process-snapshotdelta">Process snapshot/delta<a class="hash-link" href="#process-snapshotdelta" title="Direct link to heading">​</a></h3><p>To process <code>snapshot</code> and <code>delta</code> messages, please follow these rules:</p><p>Once you have subscribed successfully, you will receive a <code>snapshot</code>. The WebSocket will keep pushing <code>delta</code> messages every time the orderbook changes. If you receive a new <code>snapshot</code> message, you will have to reset your local orderbook. If there is a problem on Bybit&#x27;s end, a <code>snapshot</code> will be re-sent, which is guaranteed to contain the latest data.</p><p>To apply <code>delta</code> updates:</p><ul><li>If you receive an amount that is <code>0</code>, delete the entry</li><li>If you receive an amount that does not exist, insert it</li><li>If the entry exists, you simply update the value</li></ul><p>See working code examples of this logic in the <a href="https://bybit-exchange.github.io/docs/faq#how-can-i-process-websocket-snapshot-and-delta-messages" target="_blank" rel="noopener noreferrer">FAQ</a>.</p><div class="theme-admonition theme-admonition-info alert alert--info admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"></path></svg></span>info</div><div class="admonitionContent_S0QG"><ul><li>Linear, inverse, spot level 1 data: if 3 seconds have elapsed without a change in the orderbook, a <code>snapshot</code> message will be pushed again, and the field <code>u</code> will be the
same as that in the previous message.</li><li><strong>Linear, inverse, spot level 1 data has <code>snapshot</code> message only</strong></li><li><strong>PreLaunch contracts</strong>: there is no feed until <code>ContinuousTrading</code> stage</li></ul></div></div><div class="theme-admonition theme-admonition-note alert alert--secondary admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>reminder</div><div class="admonitionContent_S0QG"><ul><li>Spot (all levels) &amp; Futures (Level 1): the &quot;ts&quot; field appears <strong>before</strong> the &quot;type&quot; field in the JSON message, e.g., <code>{&quot;toptic&quot;: &quot;orderbook.1.BTCUSDT&quot;, &quot;ts&quot;: &quot;1772694601512&quot;, &quot;type&quot;: &quot;snapshot&quot;, ...}</code></li><li>Futures (all other levels): the &quot;ts&quot; field appears <strong>after</strong> the &quot;type&quot; field in the JSON message, e.g., <code>{&quot;toptic&quot;: &quot;orderbook.50.BTCUSDT&quot;, &quot;type&quot;: &quot;delta&quot;, &quot;ts&quot;: &quot;1772694601512&quot;, ...}</code></li></ul></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="response-parameters">Response Parameters<a class="hash-link" href="#response-parameters" title="Direct link to heading">​</a></h3><table><thead><tr><th align="left">Parameter</th><th align="left">Type</th><th>Comments</th></tr></thead><tbody><tr><td align="left">topic</td><td align="left">string</td><td>Topic name</td></tr><tr><td align="left">type</td><td align="left">string</td><td>Data type. <code>snapshot</code>,<code>delta</code></td></tr><tr><td align="left">ts</td><td align="left">number</td><td>The timestamp (ms) that the system generates the data</td></tr><tr><td align="left">data</td><td align="left">map</td><td>Object</td></tr><tr><td align="left">&gt; s</td><td align="left">string</td><td>Symbol name</td></tr><tr><td align="left">&gt; b</td><td align="left">array</td><td>Bids. For <code>snapshot</code> stream. Sorted by price in descending order</td></tr><tr><td align="left">&gt;&gt; b<!-- -->[0]</td><td align="left">string</td><td>Bid price</td></tr><tr><td align="left">&gt;&gt; b<!-- -->[1]</td><td align="left">string</td><td>Bid size <ul><li>The delta data has size=0, which means that all quotations for this price have been filled or cancelled</li></ul></td></tr><tr><td align="left">&gt; a</td><td align="left">array</td><td>Asks. For <code>snapshot</code> stream. Sorted by price in ascending order</td></tr><tr><td align="left">&gt;&gt; a<!-- -->[0]</td><td align="left">string</td><td>Ask price</td></tr><tr><td align="left">&gt;&gt; a<!-- -->[1]</td><td align="left">string</td><td>Ask size <ul><li>The delta data has size=0, which means that all quotations for this price have been filled or cancelled</li></ul></td></tr><tr><td align="left">&gt; u</td><td align="left">integer</td><td>Update ID<ul><li>Occasionally, you&#x27;ll receive &quot;u&quot;=1, which is a snapshot data due to the restart of the service. So please overwrite your local orderbook</li><li>For level 1 of linear, inverse Perps and Futures, the snapshot data will be pushed again when there is no change in 3 seconds, and the &quot;u&quot; will be the same as that in the previous message</li></ul></td></tr><tr><td align="left">&gt; seq</td><td align="left">integer</td><td>Cross sequence <ul><li>You can use this field to compare different levels orderbook data, and for the smaller seq, then it means the data is generated earlier. </li></ul></td></tr><tr><td align="left">cts</td><td align="left">number</td><td>The timestamp from the matching engine when this orderbook data is produced. It can be correlated with <code>T</code> from <a href="/docs/v5/websocket/public/trade">public trade channel</a></td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_LWe7" id="subscribe-example">Subscribe Example<a class="hash-link" href="#subscribe-example" title="Direct link to heading">​</a></h3><div class="language-python codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-python codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">from</span><span class="token plain"> pybit</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">unified_trading </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">import</span><span class="token plain"> WebSocket</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">from</span><span class="token plain"> time </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">import</span><span class="token plain"> sleep</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">ws </span><span class="token operator">=</span><span class="token plain"> WebSocket</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    testnet</span><span class="token operator">=</span><span class="token boolean">True</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    channel_type</span><span class="token operator">=</span><span class="token string" style="color:rgb(255, 121, 198)">&quot;linear&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">def</span><span class="token plain"> </span><span class="token function" style="color:rgb(80, 250, 123)">handle_message</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">message</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">print</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain">message</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">ws</span><span class="token punctuation" style="color:rgb(248, 248, 242)">.</span><span class="token plain">orderbook_stream</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    depth</span><span class="token operator">=</span><span class="token number">50</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    symbol</span><span class="token operator">=</span><span class="token string" style="color:rgb(255, 121, 198)">&quot;BTCUSDT&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    callback</span><span class="token operator">=</span><span class="token plain">handle_message</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token keyword" style="color:rgb(189, 147, 249);font-style:italic">while</span><span class="token plain"> </span><span class="token boolean">True</span><span class="token punctuation" style="color:rgb(248, 248, 242)">:</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    sleep</span><span class="token punctuation" style="color:rgb(248, 248, 242)">(</span><span class="token number">1</span><span class="token punctuation" style="color:rgb(248, 248, 242)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="response-example">Response Example<a class="hash-link" href="#response-example" title="Direct link to heading">​</a></h3><div class="tabs-container tabList__CuJ"><ul role="tablist" aria-orientation="horizontal" class="tabs"><li role="tab" tabindex="0" aria-selected="true" class="tabs__item tabItem_LNqP tabs__item--active">Snapshot</li><li role="tab" tabindex="-1" aria-selected="false" class="tabs__item tabItem_LNqP">Delta</li></ul><div class="margin-top--md"><div role="tabpanel" class="tabItem_Ymn6"><div class="language-json codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-json codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token property">&quot;topic&quot;</span><span class="token operator">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;orderbook.50.BTCUSDT&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token property">&quot;type&quot;</span><span class="token operator">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;snapshot&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token property">&quot;ts&quot;</span><span class="token operator">:</span><span class="token plain"> </span><span class="token number">1672304484978</span><span class="token punctuation" style="color:rgb(248, 248, 242)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">    </span><span class="token property">&quot;data&quot;</span><span class="token operator">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">        </span><span class="token property">&quot;s&quot;</span><span class="token operator">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">&quot;BTCUSDT&quot;</span><span class="token punctuation" style="color:rgb(248, 248, 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