GA4 Realtime API The Realtime API is GA4's "what's happening right now" endpoint. Different from : | | (Data API) | (Realtime) | |---|---|---| | Freshness | 24-48h lag, stable | Last 30 min, rolling | | Window | Any date range | Implicit — last 30 min | | Metrics | 50 supported | 10 supported (subset) | | Dimensions | 150 supported | 15 supported (subset) | | Quota | Per-property daily | Separate Realtime quota | | Use case | Reports, dashboards, trend analysis | Live dashboards, monitoring, "are we down?" | Don't try to use for now-data — its freshest data point is yesterday. Use . Minimum v…