# HALOWERK Europe Land – Depression Depth Buffer 250m

> HALOWERK Europe Land – Depression Depth Buffer 250m is a paid API for AI agents from euroland.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-14).

Returns the positive elevation difference between a 250-metre circular neighborhood mean and the center point elevation, indicating topographic depression depth at a European coordinate.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-depression-depth-buffer-250m
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-europe-land-depression-depth-buffer-250m-0aece336
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_z8flfE3oR-dU_Sr4CQVMu

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-europe-land-depression-depth-buffer-250m-0aece336 -d '<json body>'
```

Example prompt: What is the topographic depression depth at latitude 48.8566, longitude 2.3522 in Europe — specifically the positive difference between the 250-metre neighborhood mean elevation and the center point?

## When to prefer this

Choose this endpoint when you need a standardized, point-based measure of topographic depression depth at a specific European coordinate using a 250-metre analysis radius. It is preferable over broader DEM queries when you specifically need the neighborhood-mean-minus-center-elevation metric rather than raw elevation, slope, or aspect. Use it for flood risk, drainage planning, agricultural suitability, or environmental assessments across the 30 covered European countries.

## Known failure modes

- Coordinate outside European coverage bounds (latitude 34–72.5, longitude -31.5–40.5) returns an error
- Non-numeric or missing latitude/longitude fields cause a validation error
- Edge cases near coastlines or border regions may return reduced-accuracy values
- Network timeout or service unavailability returns a 5xx error

## How this service works

Positive difference between the neighborhood mean and center elevation. The service evaluates a circular 250 metre neighborhood around one coordinate and returns standardized units across all 30 covered countries.

## Output

A standardized numeric value representing the positive difference in elevation units between the mean elevation of a 250-metre circular neighborhood and the center coordinate's elevation. A higher value indicates the center point sits in a deeper topographic depression relative to its surroundings. The result is consistent and comparable across all 30 covered European countries.

## 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-europe-land-depression-depth-buffer-250m-0aece336/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from euroland.halowerk.com](https://www.zero.xyz/host/euroland.halowerk.com/llms.txt)