# CoinMetricsClient.get\_stream\_market\_open\_interest

```python
coinmetrics.api_client.CoinMetricsClient.get_stream_market_open_interest(
    markets,
    backfill=None,
)
```

Returns a websocket stream of market open interest for the requested markets.

* **Parameters:**
  * **markets** (*Union* *\[*[*str*](https://docs.python.org/3/library/stdtypes.html#str) *,* *List* *\[*[*str*](https://docs.python.org/3/library/stdtypes.html#str) *]* *]*) -- Comma separated list of markets or market patterns like exchange-\* or exchange-\*-spot or \*USDT-future. Use the /catalog-all/markets endpoint for the full list of supported markets.
  * **backfill** (*Optional* *\[*[*str*](https://docs.python.org/3/library/stdtypes.html#str) *]*) -- What data should be sent upon a connection. By default the latest values are sent just before real-time data.
* **Returns:**

**Returns:**

* [CmStream](https://gitbook-docs.coinmetrics.io/python-api-client/reference/coinmetricsclient/timeseries/pages/bqX2N1JuIuxQlz60rVmB#coinmetrics.api_client.CmStream)


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