Event Metrics

Room ID: polymarket_event_metrics
Endpoint: wss://api.struct.to/ws
Rate: 0.025 credits per message

Stream aggregated metric updates at the event level. This room provides volume, fee, and activity data rolled up across all markets within an event. The event_slugs filter is required. You may optionally specify timeframes to limit which windows you receive.

Filters

Filter	Type	Required	Description
`event_slugs`	`string[]`	Yes	Events to track by slug
`timeframes`	`string[]`	No	Timeframe windows to receive updates for
`subscribe_all`	`boolean`	No	Firehose: receive every event’s metrics. `event_slugs` are ignored when set; the `timeframes` filter still applies

Example

{
  "type": "join_room",
  "payload": {
    "room_id": "polymarket_event_metrics"
  }
}

{
  "type": "room_message",
  "payload": {
    "room_id": "polymarket_event_metrics",
    "message": {
      "action": "subscribe",
      "event_slugs": ["us-presidential-election-2026"]
    }
  }
}

Response

{
  "type": "event_metrics_stream_subscribe_response",
  "room_id": "polymarket_event_metrics",
  "data": {
    "event_slugs": ["us-presidential-election-2026"],
    "timeframes": [],
    "rejected": []
  }
}

Events

`event_metrics_update`

Volume on Polymarket vs. Struct. Polymarket’s UI reports “volume” as notional (the count of shares or contracts traded), which corresponds to shares_volume in Struct payloads. usd_volume is the dollar value of those trades. Use shares_volume to match figures shown on Polymarket and usd_volume for true USD throughput.

USD and shares volumes are decimal strings to preserve precision. Builder-attributed fields cover the subset of activity routed through builder-signed orders.

{
  "type": "event_metrics_update",
  "room_id": "polymarket_event_metrics",
  "data": {
    "event_slug": "us-presidential-election-2026",
    "timeframe": "1h",
    "timestamp": 1743500000,
    "usd_volume": "2500000.00",
    "shares_volume": "3850000.00",
    "builder_usd_volume": "620000.00",
    "builder_shares_volume": "955000.00",
    "fees": 5000.0,
    "builder_fees": 1240.0,
    "txns": 12400,
    "builder_txns": 3100,
    "unique_traders": 3200,
    "unique_builder_traders": 820
  }
}

Last modified on July 13, 2026

Market Metrics

Position Metrics

Introduction

Rooms

Alerts

Filters

Example

Response

Events

`event_metrics_update`

​Subscribe

​Filters

​Example

​Response

​Events

​event_metrics_update

Subscribe

Filters

Example

Response

Events

`event_metrics_update`