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FastX402 Haversine Distance Calculator
x402
FastX402 Haversine Distance Calculator is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-27).
Calculates the great-circle distance and initial bearing between two geographic coordinates using the Haversine formula
Price / call$0.001
Success—
StatusUnknown
How this service works
200 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
Returns a JSON object with the computed distance as a decimal number, the unit used (km, mi, or nm), and the initial bearing in degrees from point A toward point B.
Example use cases
Delivery radius eligibility check
“Is a customer at 37.7749° N, 122.4194° W within 50 km of our warehouse at 37.3382° N, 121.8863° W? Give me the distance in kilometers.”
Flight distance between cities
“How many nautical miles is it from Los Angeles (34.0522, -118.2437) to Tokyo (35.6762, 139.6503)? Use nautical miles as the unit.”
Hiking trail segment length
“What's the distance in miles between the trailhead at latitude 36.4864, longitude -118.5658 and the summit at latitude 36.5785, longitude -118.2923?”
Technical details
Endpoint
GEThttps://fastx402.tools/haversine-distance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, accurate great-circle distance computation between two lat/lon pairs without setting up an account or API key. It is ideal for lightweight geospatial calculations in agent workflows where you want pay-per-use pricing ($0.001 USDC) and no subscription overhead. Prefer this over full mapping APIs when you only need distance and bearing, not routing, geocoding, or map rendering.
Side effects
- Missing required query parameters (lat1, lon1, lat2, lon2) returns an error
- Invalid coordinate values (out of range lat/lon) may produce incorrect results or an error
- Invalid unit enum value returns an error
- Payment failure via x402 prevents the request from being processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"unit": "km",
"distance": 349.356,
"initial_bearing": 108.73
}
}Tags
x402
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