# HALOWERK Atlantic Land – France Local Relief (Elevation Range)

> HALOWERK Atlantic Land – France Local Relief (Elevation Range) 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 the difference between maximum and minimum sampled surface elevation (local relief) for a given coordinate within France.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/fr-local-relief
- 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-local-relief-elevation-range-c6f41de0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_b2ZtZkev0Dsa0GKUzUDYB

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-local-relief-elevation-range-c6f41de0 -d '<json body>'
```

Example prompt: What's the local relief — the difference between the highest and lowest surface elevation — at latitude 45.75, longitude 4.85 in France?

## When to prefer this

Use this endpoint when you need a quick, per-point local relief metric (elevation range) for a specific coordinate within France, especially for terrain ruggedness screening, site suitability, hydrology, or agricultural assessments. It is pre-validated against France's boundary, so invalid out-of-country requests are rejected without charge. Prefer it over general DEM APIs when you specifically need the France-scoped local relief computation at low cost ($0.003/call).

## Known failure modes

- Coordinate outside France boundary: request rejected before payment, with a boundary validation error
- Latitude or longitude out of the accepted European coverage range (lat 34–72.5, lon -31.5–40.5): validation error
- Malformed or missing coordinate fields: schema validation error
- Service unavailable or upstream elevation data error: 5xx response

## How this service works

Difference between maximum and minimum sampled surface elevation. The coordinate is validated against the Natural Earth boundary for France; results outside it are rejected before payment.

## Output

A numeric value representing the local relief (difference between maximum and minimum sampled surface elevation) at the specified coordinate within France. Coordinates outside the Natural Earth boundary for France 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-local-relief-elevation-range-c6f41de0/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)