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Haversine Great-Circle Distance Calculator
x402
Haversine Great-Circle Distance Calculator is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.0022/call, status unknown (last checked 2026-09-13).
Calculates the haversine great-circle distance and bearing between two geographic coordinates, returning results in km, miles, and bearing degrees.
Price / call$0.0022
Success—
StatusUnknown
How this service works
Haversine great-circle distance between two coordinates. Returns km, miles, bearing degrees. Use ?lat1=X and lng1=Y and lat2=A and lng2=B. Built for AI agents for proximity checks and routing pre-filters.
Output
Returns an object containing the great-circle distance in kilometers, distance in miles, and the bearing in degrees between the two input coordinate pairs.
Example use cases
Field service dispatch optimization
“Before sending our repair technician to the next job, tell me how far they'll need to travel from their current location and what direction to head.”
Location-based alert filtering
“We're getting alerts from sensors all over the city. Filter down to only the ones within 5 kilometers of our warehouse, and tell me which direction each one is from us.”
Real-time ride matching proximity
“A rider just requested a pickup at coordinates 40.7505, -73.9972. Show me the straight-line distance to our three nearest available drivers so we can send the closest one.”
Technical details
Endpoint
GEThttps://api.x402node.dev/maps/distanceWhen to prefer
Use this endpoint when you need a fast, lightweight great-circle distance calculation between two known coordinate pairs — especially for proximity checks, routing pre-filters, or deciding whether two points are within a threshold distance. Prefer this over full routing APIs when you only need straight-line distance and bearing without turn-by-turn directions or road network data.
Side effects
- Missing or invalid lat/lng parameters — endpoint may return an error or unexpected result
- Coordinates out of valid range (lat outside -90 to 90, lng outside -180 to 180) causing computation errors
- Payment failure due to insufficient USDC balance (x402 payment required at $0.0022 per call)
- Malformed request body causing a 400-level error
Input
{
"lat1": 40.7128,
"lat2": 51.5074,
"lng1": -74.006,
"lng2": -0.1278
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"to": {
"lat": 51.5074,
"lng": -0.1278
},
"from": {
"lat": 40.7128,
"lng": -74.006
},
"_hint": "x402 paid endpoints for AI agents — x402node.dev (utilities) · cn402.com (Chinese culture)",
"bearing_deg": 51.21,
"distance_km": 5570.222,
"distance_miles": 3461.175
}Tags
x402
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