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Almanac Earth Magnetic Field API
x402
Almanac Earth Magnetic Field API is a paid API for AI agents from almanac.locomot.io, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Returns Earth's geomagnetic field components (declination, inclination, intensity) for a given latitude/longitude using the World Magnetic Model (WMM)
Price / call$0.002
Success—
StatusUnknown
How this service works
Deterministic WMM2025 magnetic field (one location/date). Free sample, no payment required: GET /play/field
Output
Returns a JSON object with geomagnetic field components including declination (degrees), inclination/dip angle (degrees), total field intensity (nanoTeslas), horizontal intensity, north/east/down vector components, secular variation rates, the WMM model epoch and valid range, and a human-readable compass note explaining the magnetic offset from true north.
Example use cases
Example prompt
“What's the magnetic declination and total field intensity at latitude 37.7749, longitude -122.4194 right now, at ground level?”
Technical details
Endpoint
GEThttps://almanac.locomot.io/fieldWhen to prefer
Use this endpoint when you need precise geomagnetic field data (declination, inclination, intensity) derived from the authoritative World Magnetic Model — ideal for compass calibration, navigation correction, drone/aviation systems, surveying, or any application requiring the difference between true north and magnetic north at a specific point on Earth. Prefer this over lookup tables or approximations when accuracy and current secular variation matter.
Side effects
- Missing required lat or lon parameters returns a 400 error
- Latitude out of range [-90,90] or longitude out of range [-180,180] returns validation error
- Invalid ISO date string for 'when' parameter causes parse error
- Altitude outside WMM valid range [-1, 850 km] may return warning or error
- Unpaid or insufficient x402 payment returns 402 Payment Required
- Date outside WMM model valid range returns an out-of-range error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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