更新文档，添加和修改多个API接口的描述，确保文档内容的准确性和完整性，提升开发者使用体验。

2026-09-12 17:58:07 +00:00 · 2025-09-27 02:10:28 +08:00
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+!!! info "[WSTickerFeedSelectorV1](/../../schemas/ws_ticker_feed_selector_v1)"
+    Subscribes to a ticker feed for a single instrument. The `ticker.s` channel offers simpler integration. To experience higher publishing rates, please use the `ticker.d` channel.<br>Unlike the `ticker.d` channel which publishes an initial snapshot, then only streams deltas after, the `ticker.s` channel publishes full snapshots at each feed.<br><br>The Delta feed will work as follows:<ul><li>On subscription, the server will send a full snapshot of the ticker.</li><li>After the snapshot, the server will only send deltas of the ticker.</li><li>The server will send a delta if any of the fields in the ticker have changed.</li></ul><br><br>Field Semantics:<ul><li>[DeltaOnly] If a field is not updated, {}</li><li>If a field is updated, {field: '123'}</li><li>If a field is set to zero, {field: '0'}</li><li>If a field is set to null, {field: ''}</li></ul><br>
+
+    |Name<br>`Lite`|Type|Required<br>`Default`| Description |
+    |-|-|-|-|
+    |instrument<br>`i` |string|True|The readable instrument name:<ul><li>Perpetual: `ETH_USDT_Perp`</li><li>Future: `BTC_USDT_Fut_20Oct23`</li><li>Call: `ETH_USDT_Call_20Oct23_2800`</li><li>Put: `ETH_USDT_Put_20Oct23_2800`</li></ul>|
+    |rate<br>`r` |integer|True|The minimal rate at which we publish feeds (in milliseconds)<br>Delta (100, 200, 500, 1000, 5000)<br>Snapshot (500, 1000, 5000)|