> ## 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.

# Event Metrics

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

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

The `event_metrics` callback fires when an event's aggregated metrics cross your thresholds within a timeframe. The full payload schema is in the auto-generated [Event Metrics callback](/api-reference/webhook-callbacks/event-metrics-callback) reference; this page documents the filters and matching behavior.

## When to use this

* Detect when total volume across all markets in an event crosses a threshold inside a rolling window.
* Track fee accrual or transaction count at the event level rather than per market.
* Drive "hot event" alerts while excluding noisy short-term Up/Down markets.

## Subscription filters

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

| Filter                      | Type      | Description                                                                         |
| --------------------------- | --------- | ----------------------------------------------------------------------------------- |
| `event_slugs`               | string\[] | Restrict to specific events by slug (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`. |
| `exclude_shortterm_markets` | boolean   | Exclude short-term Up/Down markets.                                                 |

## Example

```json theme={null}
{
  "url": "https://your-server.com/webhooks",
  "event": "event_metrics",
  "filters": {
    "min_volume_usd": 250000,
    "timeframes": ["24h"],
    "exclude_shortterm_markets": true
  }
}
```

## Notes

* `timeframes` selects which rolling windows are evaluated; the event fires when the thresholds are met in any listed window.
* Set `exclude_shortterm_markets` to drop high-churn Up/Down markets from the aggregation.