> For the complete documentation index, see [llms.txt](https://docs.21x.eu/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.21x.eu/websocket-api/ticker.md).

# Ticker

## Ticker data

This guide explains how to use the WebSocket API to subscribe to market data updates via the `/ticker` channel.

***

### Overview

The WebSocket API allows clients to receive real-time market data updates. Subscribing to the `/ticker` channel provides updates for market ticker data, including prices, bids, asks, and quantities.

***

### Channel

#### `/ticker/*`

* Subscribe to get ticker data from all active markets.

#### `/ticker/bytradingpair/{market symbol}`

* Subscribe to get ticker data from specific markets
* Client may be subscribed to many markets at the same time.

***

### Subscription

```json
{
    "id": "94c68f6e-44ba-46ec-b9fb-4eb7addfe5ea",
    "type": "subscribe",
    "channel": "ticker/*",
    "authorization": {
        "host": "vfqqino6svadzoqkann4355in4.appsync-api.eu-central-1.amazonaws.com",
        "x-amz-date": "20250117T133706Z",
        "x-api-key": "da2-vjlcb7rsira4bggsctnmzcjvwe"
    }
}
```

```
{"id":"94c68f6e-44ba-46ec-b9fb-4eb7addfe5ea","type":"subscribe_success"}
```

***

### Market Data Model

When subscribed to the `/ticker` channel, the server sends market data updates in the following format:

Content type: application/json

#### Example message

```json
{
  "channel": "ticker",
  "data": [
    {
      "symbol": "AMDIIIAX/EUROe",
      "lastPrice": 120.2,
      "bestBid": 120.05,
      "bestBidQuantity": 36,
      "bestAsk": 120.2,
      "bestAskQuantity": 150.5,
      "time": "2024-12-16T12:28:22.462Z"
    }
  ]
}
```

#### Field Descriptions

| Field             | Type     | Description                                       |
| ----------------- | -------- | ------------------------------------------------- |
| `channel`         | `string` | The name of the channel (`ticker`).               |
| `data`            | `array`  | An array of market data objects.                  |
| `symbol`          | `string` | The trading pair symbol (e.g., `AMDIIIAX/EUROe`). |
| `lastPrice`       | `number` | The last traded price.                            |
| `bestBid`         | `number` | The best bid price available.                     |
| `bestBidQuantity` | `number` | Quantity available at the best bid price.         |
| `bestAsk`         | `number` | The best ask price available.                     |
| `bestAskQuantity` | `number` | Quantity available at the best ask price.         |
| `time`            | `string` | Timestamp of the data update (ISO 8601 format).   |

***


---

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