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

# Tag Metrics

> Fire a webhook when a tag's aggregated metrics cross your thresholds within a timeframe.

<Note>
  **Event:** `tag_metrics` \
  **Cost:** 0.1 credits per delivery
</Note>

The `tag_metrics` callback fires when a tag's aggregated metrics across all tagged markets cross your thresholds within a timeframe. The full payload schema is in the auto-generated [Tag Metrics callback](/api-reference/webhook-callbacks/tag-metrics-callback) reference; this page documents the filters and matching behavior.

## When to use this

* Detect when total volume across every market under a tag crosses a threshold inside a rolling window.
* Track category-level fee accrual or transaction count for tags like Politics or Sports.
* Power "trending category" alerts driven by aggregated activity across tagged markets.

## Subscription filters

Add these to the `filters` object when you create the subscription.

| Filter               | Type      | Description                                                                         |
| -------------------- | --------- | ----------------------------------------------------------------------------------- |
| `tags`               | string\[] | Restrict to specific market tags (max 500).                                         |
| `min_volume_usd`     | number    | Minimum traded volume in USD.                                                       |
| `max_volume_usd`     | number    | Maximum traded volume in USD.                                                       |
| `min_fees`           | number    | Minimum fees accrued in USD.                                                        |
| `min_txns`           | integer   | Minimum transaction count.                                                          |
| `min_unique_traders` | integer   | Minimum number of unique traders.                                                   |
| `timeframes`         | string\[] | One or more windows: `1m`, `5m`, `30m`, `1h`, `6h`, `24h`, `7d`, `30d`, `lifetime`. |

## Example

```json theme={null}
{
  "url": "https://your-server.com/webhooks",
  "event": "tag_metrics",
  "filters": {
    "tags": ["politics", "elections"],
    "min_volume_usd": 100000,
    "timeframes": ["24h"]
  }
}
```

## Notes

* `timeframes` selects which rolling windows are evaluated; the event fires when the thresholds are met in any listed window.
* Metrics are aggregated across all markets carrying the listed tags.