# How To Find Which Metrics A Chain Supports

Use `master.json` to discover which metrics a chain supports before you query exports or generate code. This avoids invalid assumptions and lets you exclude unsupported combinations up front.

## Explore It Live

* Live platform: <https://www.growthepie.com/>

## API Path

* `https://api.growthepie.com/v1/master.json`

## Example Request

```bash
curl -s https://api.growthepie.com/v1/master.json
```

## Real Task Example

```python
import requests

master = requests.get("https://api.growthepie.com/v1/master.json", timeout=30).json()
print(master["chains"]["arbitrum"]["supported_metrics"])
```

## Caveats

* Check `deployment` or `deployment_flag` as well as `supported_metrics`.
* Use the live metadata instead of hardcoding support tables.

## Related Pages

* [Endpoint: master.json](/api-reference/api/master-json.md)
* [How To Identify Chains With Stale Data](https://github.com/growthepie/wiki/blob/master/gitbook/use-cases/how-to-identify-chains-with-stale-data.md)


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