# HALOWERK Atlantic Land – France Surface Elevation

> HALOWERK Atlantic Land – France Surface Elevation is a paid API for AI agents from atlantikland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns bilinear-interpolated surface elevation in meters for a WGS84 coordinate within France, sourced from Copernicus DEM GLO-30, with boundary validation against Natural Earth France polygon.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/fr-elevation
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-atlantic-land-france-surface-elevation-84e1ae51
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2-Jf-1YT-V5ib2zr-7pAL

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability halowerk-atlantic-land-france-surface-elevation-84e1ae51 -d '<json body>'
```

Example prompt: What is the surface elevation at latitude 45.8326 and longitude 6.8652 in France using the Copernicus DEM GLO-30 data?

## When to prefer this

Use this endpoint when you need a precise, single-point surface elevation for a coordinate confirmed to be within France, sourced from the high-resolution Copernicus DEM GLO-30 (30 m posting). It is preferable over generic elevation APIs when France-specific boundary validation is required, when Copernicus DEM provenance matters (e.g. for regulatory or environmental workflows), or when bilinear interpolation quality is needed. It is NOT suitable for coordinates outside France or for batch/gridded elevation queries.

## Known failure modes

- Coordinate outside France boundary: request is rejected before payment with a boundary validation error
- Latitude or longitude out of the published European coverage range (lat 34–72.5, lon -31.5–40.5): schema validation error
- Missing latitude or longitude parameter: request fails with a parameter validation error
- DEM data gap or no-data cell at the exact coordinate: may return null or an error value
- Network or payment failure: x402 payment not settled, request not processed

## How this service works

Bilinear surface elevation from Copernicus DEM GLO-30. The coordinate is validated against the Natural Earth boundary for France; results outside it are rejected before payment.

## Output

A numeric surface elevation value in meters derived from bilinear interpolation of the Copernicus DEM GLO-30 raster at the requested coordinate. The response is only returned if the coordinate falls within the Natural Earth boundary for France; out-of-bounds coordinates are rejected before any charge is applied.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "latitude": {
   "type": "number",
   "maximum": 72.5,
   "minimum": 34,
   "description": "WGS84 latitude inside the published European coverage."
  },
  "longitude": {
   "type": "number",
   "maximum": 40.5,
   "minimum": -31.5,
   "description": "WGS84 longitude inside the published European coverage."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-atlantic-land-france-surface-elevation-84e1ae51/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from atlantikland.halowerk.com](https://www.zero.xyz/host/atlantikland.halowerk.com/llms.txt)