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Great-Circle Distance Calculator (km, miles, bearing, midpoint)
x402
Great-Circle Distance Calculator (km, miles, bearing, midpoint) is a paid API for AI agents from agent-data-tools.revmesh2074.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Computes the great-circle distance between two lat/lon points in km, miles, and nautical miles, plus the initial compass bearing and geographic midpoint using the haversine formula.
Price / call$0.01
Success—
StatusUnknown
How this service works
Great-circle distance between two latitude/longitude points (haversine on the mean earth radius) in kilometres, miles and nautical miles, plus the initial compass bearing and the midpoint. Accurate to about 0.5% against the ellipsoid. Use for delivery radius, travel and proximity checks, or sorting places by distance; for coordinates of a place name use geocode first.
Output
Returns a JSON object containing the distance in kilometres (km), miles, and nautical miles, the initial compass bearing as a decimal degree number and a human-readable compass direction string (e.g. 'NNE'), and the geographic midpoint as a lat/lon object. Accurate to approximately 0.5% relative to the WGS-84 ellipsoid.
Example use cases
Delivery radius eligibility check
“Can you tell me whether a customer at 37.7749° N, 122.4194° W is within 15 miles of our warehouse at 37.3382° N, 121.8863° W? Give me the exact distance in miles.”
Flight path bearing and midpoint
“What's the great-circle distance, initial compass bearing, and geographic midpoint between London (51.5074, -0.1278) and Dubai (25.2048, 55.2708)? I need it in both km and nautical miles.”
Sorting nearby venues by distance
“I have a user at coordinates 48.8566, 2.3522 and a venue at 48.8738, 2.2950 — what's the distance in kilometres and the compass direction from the user to the venue?”
Technical details
Endpoint
GEThttps://agent-data-tools.revmesh2074.workers.dev/geo/distance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need fast, accurate great-circle distance calculations between two known coordinate pairs without the overhead of a full mapping API. Ideal for delivery radius checks, proximity sorting, travel distance estimates, and navigation bearing — especially when coordinates are already known. If you need to convert a place name to coordinates first, use a geocoding endpoint before calling this. Prefer this over a full routing API when you need straight-line (as-the-crow-flies) distance rather than road distance.
Side effects
- Missing required parameter (lat1, lon1, lat2, or lon2) returns an error
- Latitude values outside -90 to 90 or longitude outside -180 to 180 cause validation errors
- Non-numeric coordinate values result in a parse or type error
- Identical coordinates return zero distance with an undefined or zero bearing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| lat1required | number | Latitude of the first point (-90 to 90) |
| lat2required | number | Latitude of the second point |
| lon1required | number | Longitude of the first point (-180 to 180) |
| lon2required | number | Longitude of the second point |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| km | number | |
| miles | number | |
| bearing | number | |
| compass | string | |
| midpoint | object | |
| nauticalMiles | number |
Tags
x402
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