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

# BBO

Push the best bid and ask whenever the BBO changes for `symbol_id`.

{% hint style="info" %}
**No auth.** Quiet markets produce no push — events are change-driven, not periodic.
{% endhint %}

## Subscribe

```json
{ "channel": "bbo", "symbol_id": 100001 }
```

## Payload

| Field | Type         | REST equivalent     |
| :---: | ------------ | ------------------- |
|  `bp` | string       | `best_bid_price`    |
|  `bq` | string       | `best_bid_quantity` |
|  `ap` | string       | `best_ask_price`    |
|  `aq` | string       | `best_ask_quantity` |
|  `t`  | integer (ms) | `time`              |

## Example Push

```json
{
  "channel": "bbo",
  "symbol_id": 100001,
  "ts": 1719500000125,
  "finality": "final",
  "data": { "bp": "67499.50", "bq": "2.4", "ap": "67500.50", "aq": "1.8", "t": 1719500000120 }
}
```


---

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