Geofencing API for last-mile delivery in the UK

UK courier and delivery platforms operate in some of the densest urban delivery environments anywhere — tight postcode clusters, high-rise residential drops, and delivery windows measured in minutes, not hours. That density is exactly where geofencing infrastructure earns its place: knowing the instant a driver crosses into a delivery zone, or the instant they've been parked outside one longer than expected, without a dispatcher watching a live map.

Fencemaker gives you that trigger layer directly. Define zones as precise polygons matching real delivery boundaries, and a webhook fires the moment a tracked device enters, exits, or dwells — pushed to you, not polled by you.

Why this matters for UK delivery operations

Boundary precision in dense urban areas. Circular radius-based geofencing breaks down fast in UK cities, where adjacent streets and postcodes sit meters apart. Polygon-based zones let you match actual delivery catchment areas instead of approximating them.

Data protection posture. Under UK GDPR and the Data Protection Act 2018, location tracking data carries real compliance weight — retention limits, purpose limitation, subject access considerations. Running geofencing infrastructure self-hosted means your data retention and processing decisions stay under your control rather than a third-party vendor's default policy.

How the trigger flow works

POST https://your-app.com/webhooks/fencemaker
{
  "event": "geofence.enter",
  "zone_id": "zone_shoreditch_e2",
  "device_id": "courier_5502",
  "timestamp": "2026-08-18T11:47:33Z",
  "coordinates": { "lat": 51.5257, "lng": -0.0798 }
}

Send that event to a Slack channel for live ops visibility, a Telegram bot for driver-facing alerts, or straight into your dispatch system to automatically progress a delivery's status.

What you get out of the box

Polygon-based zone definitions for accurate coverage of dense, irregular urban delivery areas
Native Slack and Telegram webhook delivery
Dwell-time detection for flagging stalled or delayed drops
Self-hosted deployment, keeping location data and retention policy under your control
An ops portal for defining and adjusting zones without engineering involvement

If your delivery stack is currently approximating zone detection with a mapping library and a scheduled job, Fencemaker replaces that with infrastructure built specifically for continuous, high-density delivery trigger detection.