# HALOWERK Southern Land – Greece Depression Depth

> HALOWERK Southern Land – Greece 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 the center cell elevation (depression depth) for a given coordinate within Greece.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/gr-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-greece-depression-depth-8a452579
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wnfmqFcXAj5k3fosTzs4n

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-greece-depression-depth-8a452579 -d '<json body>'
```

Example prompt: What's the depression depth — how much lower the center is compared to its surrounding neighborhood elevation — at latitude 37.97, longitude 23.72 in Greece?

## When to prefer this

Choose this endpoint when you need a precise, per-point depression depth metric for a location within Greece, particularly for land evaluation, drainage analysis, flood risk screening, or ecological surveys where knowing how much lower a point is than its surroundings is critical. It is preferable over generic DEM APIs when you need Greece-validated, pay-per-call precision without managing elevation tile downloads.

## Known failure modes

- Coordinate outside Greece boundary — request rejected, no charge applied
- Latitude or longitude out of published European coverage range — validation error
- Missing required latitude or longitude parameters — schema validation error
- Payment failure via x402 protocol — request 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 Greece; 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, indicating how much lower the target point sits relative to its immediate terrain context. Coordinates outside the Greece 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-southern-land-greece-depression-depth-8a452579/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)