Geofencing API for last-mile delivery in the US

US delivery operations live and die by ETA accuracy. Whether it's a regional courier network, a gig-delivery fleet, or a retailer running its own last-mile fulfillment, the operational question is the same: does the system know the moment a driver enters, exits, or lingers near a delivery zone — and can it act on that instantly, without a human watching a map.

Fencemaker is built around that trigger layer. You define delivery zones as polygons or radii, and the moment a tracked device crosses one, a webhook fires. No dashboard to keep open, no polling job checking positions on an interval and missing events that happen between checks.

Where geofencing actually pays off in US delivery ops

Volume without cost surprises. Many hosted geofencing platforms price per API call or per tracked device, which turns predictable at low volume into unpredictable at scale — exactly when a delivery operation is succeeding. Fencemaker runs on self-hosted infrastructure you control, so scaling event volume doesn't mean scaling your bill in the same direction.

Compliance posture. With state-level privacy regimes like the CCPA shaping how location data can be collected, stored, and retained, self-hosting the geofencing layer means you control retention policy directly rather than trusting a third party's data-handling terms.

How the trigger flow works

POST https://your-app.com/webhooks/fencemaker
{
  "event": "geofence.exit",
  "zone_id": "zone_downtown_dallas_hub",
  "device_id": "driver_2214",
  "timestamp": "2026-08-18T14:02:19Z",
  "coordinates": { "lat": 32.7767, "lng": -96.7970 }
}

Route that event wherever your ops team actually works — a Slack channel, a Telegram alert, or straight into a dispatch or TMS integration to advance a delivery status automatically.

What you get out of the box

• Polygon-based zone definitions for accurate coverage of irregular delivery territories
• Native Slack and Telegram webhook delivery
• Dwell-time detection for flagging stalled deliveries or unexpected stops
• Self-hosted deployment for predictable cost and full data control
• An ops portal for non-engineering teams to manage zones directly

If you're currently duct-taping a mapping SDK to a cron job to detect zone entry and exit, Fencemaker replaces that layer with something built specifically for it — and scales with delivery volume instead of against it.