# HALOWERK Atlantic Land – France Depression Depth

> HALOWERK Atlantic Land – France Depression Depth 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 positive elevation difference between a neighborhood mean and the center point elevation (depression depth) for a given coordinate within France.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/fr-depression-depth
- 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-depression-depth-29c02107
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_v25tS6LeTDEf04AMqYN8P

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-depression-depth-29c02107 -d '<json body>'
```

Example prompt: What is the topographic depression depth at latitude 48.8566, longitude 2.3522 in France — specifically the positive difference between the neighborhood mean elevation and the center point elevation?

## When to prefer this

Choose this endpoint when you need localized depression depth — the positive elevation gap between a neighborhood mean and a center point — specifically for coordinates within France. It is validated against the Natural Earth France boundary before charging, making it safe to call without pre-filtering. Prefer this over generic elevation APIs when you need this specific terrain morphology metric rather than raw elevation or slope.

## Known failure modes

- Coordinate outside France boundary: request is rejected before payment with a validation error
- Latitude or longitude out of published European coverage range (lat 34–72.5, lon -31.5–40.5): rejected with schema validation error
- Invalid coordinate types (non-numeric values): schema validation failure
- Network timeout or service unavailability: HTTP 5xx error

## How this service works

Positive difference between the neighborhood mean and center 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 positive difference (in meters) between the mean elevation of the surrounding neighborhood and the center-point elevation at the queried coordinate, indicating how deep a topographic depression is at that location. Coordinates outside the France Natural Earth boundary 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-depression-depth-29c02107/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)