> ## Documentation Index
> Fetch the complete documentation index at: https://alltick.co/apis/llms.txt
> Use this file to discover all available pages before exploring further.

# Latest order book

### Endpoint description

Query the maximum available order-book depth for each product type.

```http theme={null}
GET /v1/depth/{queryData}
```

| Product type                                                                      | Request URL                                                       |
| --------------------------------------------------------------------------------- | ----------------------------------------------------------------- |
| US stocks, Hong Kong stocks, A-shares, and major indices                          | `https://quote.alltick.co/quote-stock-b-api/v1/depth/{queryData}` |
| Forex, precious metals, cryptocurrencies, crude oil, CFD indices, and commodities | `https://quote.alltick.co/quote-b-api/v1/depth/{queryData}`       |

### Request parameters

| Parameter   | Type   | Required | Description          |
| ----------- | ------ | -------- | -------------------- |
| `X-API-Key` | string | Yes      | Authentication token |
| `queryData` | string | Yes      | Request content      |

### queryData

```json theme={null}
{
  "trace": "edd5df80-df7f-4acf-8f67-68fd2f096426",
  "data": {
    "symbol_list": [{"code": "857.HK"}, {"code": "UNH.US"}]
  }
}
```

### Response example

```json theme={null}
{
  "ret": 200,
  "msg": "ok",
  "trace": "edd5df80-df7f-4acf-8f67-68fd2f096426",
  "data": {
    "tick_list": [{"code":"857.HK","seq":"30686349","tick_time":"1677830357227","bids":[{"price":"136.424","volume":"100000.00"}],"asks":[{"price":"136.427","volume":"400000.00"}]}]
  }
}
```

### Response fields

`tick_list` contains `code`, `seq`, `tick_time`, `bids`, and `asks`; each bid or ask level has `price` and `volume`. Some CFD indices do not provide `volume`; forex, precious metals, energy, stocks, and cryptocurrencies do.