> For the complete documentation index, see [llms.txt](https://docs.koinbay.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.koinbay.com/api/websocket-market-streams.md).

# WebSocket (market streams)

Spot: **wss\://ws.koinbay.com/kline-api/ws**

Futures: **wss\://futuresws.koinbay.com/kline-api/ws**. 

Transport is binary, gzip-compressed (except ping/pong text frames). 

## Channel symbol format

* **Spot**: REST symbol as-is, lowercase — 'btcusdt' -> market\_btcusdt\_depth\_step0.
* **Futures**: {type}\_{pair} — lowercase margin-type prefix + '\_' + stripped pair. E-BTC-USDT -> 'e\_btcusdt'; S-BTC-USDT -> 's\_btcusdt'. So market\_e\_btcusdt\_depth\_step0.

## Heartbeat

Server sends ping; client must reply pong or be disconnected.

```
{"ping": 1535975085052}   ->   {"pong": 1535975085052}
```

## Subscribe frame

```
{
  "event": "sub|unsub|req",
  "params": { "channel": "...", "cb_id": "1" }
}
```

## Channels

| Channel                             | Description                  | Notes (                                                                                                                 |
| ----------------------------------- | ---------------------------- | ----------------------------------------------------------------------------------------------------------------------- |
| market\_$symbol\_depth\_step0       | Order book depth             | tick has 'asks' and 'buys' (NOT 'bids' like REST). Each level \[price, volume] as numbers.                              |
| market\_$symbol\_trade\_ticker      | Real-time trades             | tick.data\[] of trades; each has amount, ds (datetime str), price, side, ts, vol.                                       |
| market\_$symbol\_kline\_\<interval> | Kline                        | Adds amount, ds (datetime str),                                                                                         |
| market\_$symbol\_ticker             | 24h ticker                   | Spot adds bidPrice/bidVolume/askPrice/askVolume; futures tick is only vol/rose/open/low/high/close/amount (no bid/ask). |
| mark\_price\_$symbol                | Futures mark price + funding | Futures-only; NOT 'market\_' prefixed. All values strings. Has nextSettlementTime (REST /index does not).               |


---

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