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geo402 Great-Circle Distance
x402
geo402 Great-Circle Distance is a paid API for AI agents from geo402.alogos.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Calculates the great-circle (shortest spherical) distance between two geographic coordinates, returning the result in the specified unit.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call geolocation utility for AI agents: geocoding, reverse geocoding, timezone lookup, and great-circle distance. No API key, no subscription — agents pay per request via x402 (Base/USDC) or MPP (Tempo/pathUSD).
Output
Returns the computed great-circle distance between the two coordinate pairs, expressed in the requested unit (e.g., kilometers, miles, or nautical miles). The response is a numeric distance value along the shortest spherical path between the two points.
Example use cases
Example prompt
“What's the great-circle distance in kilometers between New York City (40.7128° N, 74.0060° W) and London (51.5074° N, 0.1278° W)?”
Technical details
Endpoint
GEThttps://geo402.alogos.xyz/v1/distanceWhen to prefer
Use this endpoint when an AI agent needs a fast, lightweight, pay-per-call computation of the straight-line (great-circle) distance between two known coordinate pairs, without needing geocoding or address resolution. Ideal for scenarios where coordinates are already known and only the distance metric is needed. Prefer over subscription-based geospatial APIs when usage is occasional or cost-per-call billing is preferred.
Side effects
- Missing required parameters (lat1, lon1, lat2, lon2) returns a 400 error
- Out-of-range latitude (outside -90 to 90) or longitude (outside -180 to 180) may return a validation error
- Invalid or unsupported unit string may fall back to a default unit or return an error
- Payment not provided or insufficient USDC/pathUSD triggers a 402 Payment Required response
- Network timeout or server unavailability returns a 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| lat1required | number | Start latitude in decimal degrees. |
| lat2required | number | Destination latitude in decimal degrees. |
| lon1required | number | Start longitude in decimal degrees. |
| lon2required | number | Destination longitude in decimal degrees. |
| unit | string | Distance unit: kilometers, miles, meters, or nautical miles. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| lat1 | number | |
| lat2 | number | |
| lon1 | number | |
| lon2 | number | |
| unit | string | |
| bearing | number | |
| distance | number | |
| distanceKm | number | |
| distanceMi | number |
Tags
x402
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