> ## 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 Volume Milestone

> Get notified when an event's aggregated volume crosses a USD milestone.

<Note>
  **Event:** `event_volume_milestone` \
  **Endpoint:** `wss://api.struct.to/ws/alerts` \
  **Cost:** 0.2 credits per event
</Note>

Get notified when an event's aggregated volume crosses a USD milestone. You must specify at least one timeframe to subscribe.

## Filters

| Filter                      | Type       | Required | Description                                                                           |
| --------------------------- | ---------- | -------- | ------------------------------------------------------------------------------------- |
| `timeframes`                | string\[]  | Yes      | Timeframe windows: `1m`, `5m`, `30m`, `1h`, `6h`, `24h`, `7d`, `30d` (max 500)        |
| `milestone_amounts`         | integer\[] | No       | USD milestone amounts to watch, positive integers (max 500). If empty, no events fire |
| `event_slugs`               | string\[]  | No       | Restrict to specific events (max 500)                                                 |
| `exclude_shortterm_markets` | boolean    | No       | Exclude short-term markets from results                                               |

## Subscribe

```json theme={null}
{
  "op": "subscribe",
  "event": "event_volume_milestone",
  "timeframes": ["1h", "24h"],
  "milestone_amounts": [50000, 100000]
}
```

## Response

```json theme={null}
{
  "event": "event_volume_milestone",
  "timestamp": 1775913505260,
  "data": {
    "event_slug": "us-presidential-election-2028",
    "timeframe": "24h",
    "milestone_usd": 100000,
    "current_volume_usd": 103450.60,
    "fees": 1034.50,
    "txns": 287
  }
}
```