# HALOWERK Southern Land – Spain Depression Depth

> HALOWERK Southern Land – Spain Depression Depth is a paid API for AI agents from suedland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the positive elevation difference between the neighborhood mean and center cell elevation (depression depth) for a given coordinate within Spain.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/es-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-southern-land-spain-depression-depth-f4856f97
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__sm9BJZ5HY0XSYvDtUC_7

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-southern-land-spain-depression-depth-f4856f97 -d '<json body>'
```

Example prompt: What's the terrain depression depth at latitude 37.42, longitude -5.88 in Spain — I need to know how much lower that center point is compared to the surrounding neighborhood elevation.

## When to prefer this

Choose this endpoint when you need a precise terrain depression depth metric (positive neighborhood-mean minus center elevation) for a specific coordinate within Spain, particularly for land assessment use cases such as agriculture site selection, drainage analysis, or topographic profiling. It is the right choice when you need a single-point Spain-validated computation rather than a generic DEM query or multi-country terrain service.

## Known failure modes

- Coordinate outside Spain's Natural Earth boundary — request rejected before payment is charged
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Invalid or missing latitude/longitude values — input validation failure
- Payment failure via x402 protocol — call not processed

## How this service works

Positive difference between the neighborhood mean and center elevation. The coordinate is validated against the Natural Earth boundary for Spain; 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 cells and the center cell elevation at the queried coordinate, indicating how much the center point is depressed relative to its surroundings. Returns an error if the coordinate falls outside Spain's Natural Earth boundary.

## 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-southern-land-spain-depression-depth-f4856f97/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suedland.halowerk.com](https://www.zero.xyz/host/suedland.halowerk.com/llms.txt)