# HALOWERK Atlantic Land – Netherlands Depression Depth

> HALOWERK Atlantic Land – Netherlands 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 difference between a neighborhood mean elevation and the center point elevation, indicating topographic depression depth for a coordinate in the Netherlands.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/nl-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-netherlands-depression-depth-c8a0fdd9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_c_ftMFXYBRmssIFXh_Hve

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-netherlands-depression-depth-c8a0fdd9 -d '<json body>'
```

Example prompt: What is the topographic depression depth at latitude 52.37 and longitude 4.89 in the Netherlands — how much lower is that point compared to its surrounding terrain?

## When to prefer this

Choose this endpoint when you need a precise, point-level topographic depression depth metric specifically for Netherlands coordinates, particularly for flood risk assessment, drainage planning, or land suitability analysis. It is ideal for agents that need a validated, boundary-checked elevation sink metric rather than raw DEM data. Prefer this over generic elevation APIs when the Netherlands boundary validation and neighborhood-relative depression computation are required.

## Known failure modes

- Coordinate outside Netherlands Natural Earth boundary — request rejected before payment
- Latitude or longitude out of European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Invalid or missing coordinate fields — schema validation failure
- No depression present (flat or elevated point) — may return zero or near-zero value
- Service unavailable or payment processing error — HTTP 402 or 5xx response

## How this service works

Positive difference between the neighborhood mean and center elevation. The coordinate is validated against the Natural Earth boundary for Netherlands; results outside it are rejected before payment.

## Output

A numeric value representing the positive elevation difference (in metres) between the neighborhood mean elevation and the center point elevation at the given coordinate, indicating how much of a topographic depression exists at that location. Coordinates outside the Netherlands boundary are rejected before processing.

## 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-netherlands-depression-depth-c8a0fdd9/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)