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Duo Data Utilities – GeoJSON Polygon Geometry
x402
Duo Data Utilities – GeoJSON Polygon Geometry is a paid API for AI agents from api.duoleads.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-02).
Computes geometric predicates on a GeoJSON Polygon or MultiPolygon: point-in-polygon containment, bounding box, centroid, geodesic area (m²), perimeter length, and ring winding order.
Price / call$0.05
Success—
StatusUnknown
How this service works
Geometric predicates on a GeoJSON geometry supplied in the request: point-in-polygon with correct hole handling, bounding box, centroid, signed area in square metres, perimeter length, and ring winding order. Accepts Polygon and MultiPolygon, and a GeoJSON Feature wrapping either. Area and length are geodesic on the WGS-84 ellipsoid, correct at any latitude; containment is planar in lon/lat.
Output
A JSON object containing: ok (true), and a data object with any computed subset of: bbox ([minLon,minLat,maxLon,maxLat]), centroid ({lat,lon}), area_m2 (geodesic area on WGS-84), perimeter_m (geodesic perimeter), winding (array of 'cw'/'ccw' per ring), contains (boolean, if lat/lon provided), on_boundary (boolean), rings (count), vertices (count). Also includes meta with request_id, computed_at timestamp, price_usd, and deterministic flag.
Example use cases
Delivery zone containment check
“I have a GeoJSON polygon defining our delivery zone and a customer at lat 51.505, lon -0.09 — can you tell me whether that point is inside the polygon and also what the polygon's bounding box and centroid are?”
Land parcel area measurement
“I've got a GeoJSON Polygon for a land parcel and I need its geodesic area in square metres and its perimeter length — run all the standard geometry ops on it for me.”
Winding order audit for map rendering
“Can you check the ring winding order of this GeoJSON MultiPolygon for me? I want to make sure it's counter-clockwise so it renders correctly, and also grab the centroid while you're at it.”
Technical details
Endpoint
GEThttps://api.duoleads.com/v1/geo/polygon?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need deterministic, server-side geodesic geometry computations on GeoJSON polygons — especially when correct hole handling, accurate WGS-84 area/perimeter at any latitude, or point-in-polygon tests are required without installing a geospatial library. Prefer it over client-side turf.js or PostGIS when you need a stateless, pay-per-call API with no infrastructure setup. Best for single polygon analysis up to 2000 coordinate pairs.
Side effects
- geometry string exceeds 3072 characters — returns error
- more than 2000 coordinate pairs — returns error
- invalid or malformed GeoJSON — returns validation error
- lat/lon out of valid WGS-84 range — returns parameter error
- geometry type other than Polygon/MultiPolygon/wrapping Feature — returns unsupported type error
- missing required geometry query param — returns 400 bad request
- payment not received — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"data": {
"bbox": [
4.85,
52.35,
4.95,
52.4
],
"rings": 1,
"area_m2": 37890432.411,
"winding": [
"ccw"
],
"centroid": {
"lat": 52.37500000001563,
"lon": 4.900000000001667
},
"contains": true,
"vertices": 4,
"on_boundary": false,
"perimeter_m": 24747.979
},
"meta": {
"price_usd": "0.05",
"disclaimer": "Factual output of a deterministic computation over public data. Provided as is, with no warranty of accuracy, completeness or availability. Not investment, financial, legal, tax, medical or any other professional advice, and not a recommendation. Verify before relying on it. Terms: https://api.duoleads.com/terms",
"request_id": "01K6B7Q4ZC8H3F2M9WXR5TYN0D",
"computed_at": "2026-09-28T12:00:00.000Z",
"deterministic": true
},
"route": "/v1/geo/polygon",
"version": "1.0.0"
}
}Tags
x402
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