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Duo Data Utilities – Geodesic Distance & Navigation
x402
Duo Data Utilities – Geodesic Distance & Navigation 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 geodesic distance (Vincenty/haversine), initial and final bearing, midpoint, and destination point between WGS-84 coordinates, plus cumulative path length, in metres, km, nautical miles, and miles.
Price / call$0.05
Success—
StatusUnknown
How this service works
Distance and direction between WGS-84 coordinates: geodesic distance by Vincenty with a haversine fallback, initial and final bearing, the midpoint, and the destination point reached from a start point on a given bearing and distance. Also computes the cumulative length of a supplied coordinate path. Results in metres, kilometres, nautical miles and miles.
Output
Returns a JSON object with an 'ok' flag, a 'data' object containing the computed results (distance in m/km/mi/nmi, midpoint lat/lon, initial and final bearings, convergence status for Vincenty), and a 'meta' object with request ID, timestamp, price, and disclaimer. The exact fields in 'data' vary by operation (distance, midpoint, destination, or path).
Example use cases
Flight route distance estimation
“Calculate the geodesic distance in kilometres and nautical miles from Sydney (lat -33.8688, lon 151.2093) to Dubai (lat 25.2048, lon 55.2708) using the Vincenty method, and tell me the initial bearing.”
GPS path total length
“I have a GPS track with these points: 48.8566,2.3522 then 51.5074,-0.1278 then 53.4808,-2.2426 — can you compute the total cumulative distance of this path in kilometres?”
Find destination from bearing and distance
“Starting from coordinates 40.7128, -74.0060, if I travel on a bearing of 90 degrees for 500,000 metres, what are the destination coordinates?”
Technical details
Endpoint
GEThttps://api.duoleads.com/v1/geo/distance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need precise ellipsoidal (WGS-84) geodesic computations — especially Vincenty accuracy for long-distance navigation, aviation, or maritime routing. Prefer it over simple flat-earth or haversine-only services when accuracy over thousands of kilometres matters, or when you need bearings, midpoints, and destination points together in one call with multi-unit output.
Side effects
- Missing required lat1/lon1/lat2/lon2 for distance or midpoint operations returns a validation error
- Vincenty algorithm fails to converge for nearly antipodal points — haversine fallback is used automatically
- Invalid or out-of-range coordinate values (e.g. latitude > 90) return a 400 error
- Path string malformed or exceeds 200 points returns a validation error
- Missing bearing or distance_m for op=destination returns a parameter error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"data": {
"method": "vincenty",
"distance": {
"m": 5878232.354,
"km": 5878.232354,
"mi": 3652.564246,
"nmi": 3173.991552
},
"midpoint": {
"lat": 53.7242681,
"lon": -39.60892324
},
"converged": true,
"bearing_final": 228.8713,
"bearing_initial": 290.8461
},
"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/distance",
"version": "1.0.0"
}
}Tags
x402
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