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Agent402 UK Haversine Great-Circle Distance
x402
Agent402 UK Haversine Great-Circle Distance is a paid API for AI agents from agent402.co.uk, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).
Computes the straight-line great-circle distance between two lat/lon coordinate pairs using the Haversine formula, returning the result in km or miles.
Price / call$0.001
Success—
StatusUnknown
How this service works
Don't burn tokens on deterministic work. Go/no-go jobs first: payout preflight, text firewall (PII/secrets), budget check — then rails, calendars, finmath. x402 USDC on Base. UK + global. agent402.co.uk — not agent402.tools. $0.001–$0.002 USDC on Base. No API keys.
Output
A JSON object containing the numeric distance value, the unit used (km or mi), and a validity flag indicating whether the input coordinates were valid and the computation succeeded.
Example use cases
Logistics route pre-screening
“What's the as-the-crow-flies distance in kilometers between our warehouse in Chicago (41.8781, -87.6298) and the delivery destination in Detroit (42.3314, -83.0458)? I need a quick aerial estimate before we check road routing.”
Shipping zone classification
“Can you calculate the straight-line distance in miles between New York (40.7128, -74.0060) and Miami (25.7617, -80.1918)? I want to know if it falls within our 1500-mile shipping tier.”
Flight distance estimation
“How many kilometers is the great-circle distance between Sydney (-33.8688, 151.2093) and Singapore (1.3521, 103.8198)? I need the aerial distance, not the flight path.”
Technical details
Endpoint
GEThttps://agent402.co.uk/v1/geo/distance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, cheap, mathematically exact great-circle (as-the-crow-flies) distance between two lat/lon points for logistics pre-screening, zone classification, or geographic filtering. Prefer it over road-routing APIs when road distance is not needed and over manual Haversine implementations when you want a reliable, hosted computation. Not suitable when turn-by-turn or road-network distance is required.
Side effects
- Missing required query parameter (lat1, lon1, lat2, lon2) returns an error response
- Invalid or out-of-range coordinate values (e.g. lat > 90) may return valid:false
- Unrecognized unit value may default to km or return an error
- Network or service unavailability returns a non-200 HTTP status
- Payment failure (402) if USDC micropayment is not resolved
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"unit": "km",
"valid": true,
"distance": 343
}
}Tags
x402
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