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Touchstone Earth Magnetic Field API
x402
Touchstone Earth Magnetic Field API is a paid API for AI agents from touchstone.locomot.io, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Returns Earth's magnetic field components, declination, inclination, and total 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
A JSON object containing the magnetic field vector components (north X, east Y, down Z in nanoteslas), declination in degrees, inclination in degrees, horizontal intensity, total intensity in nT, secular variation rates, the model name and epoch, valid date range, and a compass note explaining the declination offset.
Example use cases
Example prompt
“What's the magnetic declination and total field intensity at latitude 40.7128, longitude -74.0060 right now, at ground level?”
Technical details
Endpoint
GEThttps://touchstone.locomot.io/fieldWhen to prefer
Use this endpoint when you need precise, model-based Earth magnetic field data — including declination for compass correction, inclination, field intensity, and secular variation — at any geographic coordinate on or near Earth's surface. Prefer this over generic geolocation APIs when the application involves navigation correction, magnetometer calibration, geophysical surveys, or any use case requiring WMM-standard magnetic field values.
Side effects
- Missing required lat or lon parameters returns a validation error
- Latitude out of range [-90,90] or longitude out of range [-180,180] returns schema validation error
- Altitude outside WMM valid range [-1, 850 km] may produce unreliable results
- Invalid ISO date or decimal year in 'when' parameter returns a parse error
- Payment not included or insufficient USDC results in HTTP 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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