> ## Documentation Index
> Fetch the complete documentation index at: https://whitebit-mintlify-convert-estimation-tip-1774625811.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Market Trades

## Subscription Behavior

<Warning>
  For each WebSocket connection, subscribe to either specific markets or all markets. **Every new subscription replaces the existing one.**
</Warning>

### Subscribe to Specific Markets

To receive trade updates for specific markets, provide market names in the `params` array:

```json theme={null}
{
    "id": 9,
    "method": "trades_subscribe",
    "params": [
        "ETH_BTC",
        "BTC_USDT"
    ]
}
```

### Subscribe to All Markets

To receive trade updates for all available markets, send an empty `params` array:

```json theme={null}
{
    "id": 9,
    "method": "trades_subscribe",
    "params": []
}
```

## RPI Field

Trade updates may include an `rpi` field:

* `rpi: true` - The trade involved a Retail Price Improvement (RPI) order
* `rpi: false` or absent - Regular trade

<Note>
  RPI orders provide better execution prices than the current best bid/ask for retail traders.
</Note>

<Note>
  Public trade updates can include executions originating from RPI orders.

  Public market data feeds do not expose RPI orders as visible liquidity in `depth` or `bookTicker`. RPI orders remain visible only in private active orders and in the exchange UI order book (web and mobile).
</Note>