What is an isochrone?
A polygon of everything you can reach from a point within a given time: 20 minutes by bike, say. Ask for several times at once and you get nested bands. Ask by distance instead of time and you get an isodistance, which the same endpoint also does.
What is it for?
Delivery and service zones, catchment areas for a shop or a school, 'which of our customers can a courier reach in 30 minutes', and any question about many points that would otherwise need one route per point. Draw the polygon on a map, or keep it server-side and test coordinates against it.
How much does an isochrone cost?
Five units per contour per origin, from the same monthly pool as maps, geocoding and routing. Three bands from one origin is fifteen units. A contour is heavier than a route because it explores the whole road network out to the limit rather than one path through it.
How many bands or origins can one request have?
Up to four contours and up to four origins, as long as origins times contours is at most four. So one origin with four bands, two origins with two bands each, or four origins with one band.
Which travel profiles are supported?
Car, bicycle and pedestrian, each with its own rules. A 20-minute bike band follows cycleways and stops at the motorway; the car band runs down it.
Are the bands traffic-aware?
No. Reach is computed from the road graph (speed limits, road class, surface and turn costs), not from live traffic. Rijwind Traffic is a separate live layer for your map and does not feed into these polygons today.
What shape do the results come back in?
A GeoJSON FeatureCollection with one feature per contour, largest first so they stack when drawn in order. Each feature carries its minutes (or distance) in properties. Ask for polygons to fill an area, or lines if you only want the outline.
Is there a free tier?
Yes. The free plan includes 10,000 units a month with no card and no sales call, which is 2,000 single-band isochrones if that is all you spend them on. It is a hard cap, so a runaway loop cannot produce a bill.
Where are my requests processed?
In the European Union, end to end. No part of the request path touches a US-controlled provider, which is what makes the GDPR and data-residency conversation short. We publish a DPA and a full sub-processor list.