# HALOWERK Europe Land – Aspect (250m Buffer)

> HALOWERK Europe Land – Aspect (250m Buffer) is a paid API for AI agents from euroland.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Returns the circular direction of the dominant surface gradient (aspect), clockwise from north, computed over a 250-metre neighbourhood around a European coordinate.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-aspect-buffer-250m
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-europe-land-aspect-250m-buffer-d4106edc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eo7k5uoFjF3O3fAUER3cy

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-aspect-250m-buffer-d4106edc -d '<json body>'
```

Example prompt: What direction does the terrain face at latitude 48.85, longitude 2.35 in Europe — give me the aspect in degrees clockwise from north using a 250-metre neighbourhood?

## When to prefer this

Choose this endpoint when you need terrain aspect (slope-facing direction) for a specific European point location and want a 250-metre neighbourhood analysis for a moderate spatial context — larger than a local 60m buffer but not as broad as a 1km+ area. Ideal for environmental siting, agriculture, renewable energy prospecting, or ecological assessments across Europe where slope orientation matters and standardized cross-country units are required.

## Known failure modes

- Coordinate outside European coverage bounds (latitude 34–72.5°N, longitude -31.5–40.5°E) returns an error or no data
- Invalid or missing latitude/longitude fields return a validation error
- Flat terrain with no dominant gradient may return ambiguous or undefined aspect
- Payment failure (x402 protocol) prevents the call from completing
- Internal service error if the underlying DEM data has gaps at the queried location

## How this service works

Circular direction of the dominant surface gradient, clockwise from north. The service evaluates a circular 250 metre neighborhood around one coordinate and returns standardized units across all 30 covered countries.

## Output

A single numeric value representing the circular direction of the dominant surface gradient in degrees, measured clockwise from north (0–360°), derived from a 250-metre circular neighbourhood analysis around the supplied WGS84 coordinate. Units are standardized 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-aspect-250m-buffer-d4106edc/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)