# HALOWERK Central Land – CZ Terrain Aspect

> HALOWERK Central Land – CZ Terrain Aspect is a paid API for AI agents from mitteleuropa.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the circular direction (0–360°, clockwise from north) of the dominant surface gradient at a given coordinate within Czechia, derived from Copernicus DEM data.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/cz-aspect
- 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-central-land-cz-terrain-aspect-c0d11765
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BCSbOW3ta0oyqVLzqPhAZ

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-central-land-cz-terrain-aspect-c0d11765 -d '<json body>'
```

Example prompt: What direction does the slope face at latitude 49.8175, longitude 15.473 in Czechia — give me the aspect angle clockwise from north.

## When to prefer this

Choose this endpoint when you need the terrain aspect (slope-facing direction) specifically for a point within Czechia and want boundary pre-validation to avoid wasted payments. It is optimized for the Czech Republic coverage zone using Copernicus DEM GLO-30 data, making it more authoritative for CZ than a generic global terrain API. Prefer it for agriculture, solar siting, hydrology, or ecological analysis workflows scoped to Czechia.

## Known failure modes

- Coordinate outside Czechia boundary — rejected with error before payment
- Latitude or longitude outside published European coverage bounds (lat 34–72.5, lon -31.5–40.5) — validation error
- Flat terrain with no dominant gradient may produce undefined or zero aspect
- Network timeout or service unavailability returns error response
- Malformed or missing coordinate fields return schema validation error

## How this service works

Circular direction of the dominant surface gradient, clockwise from north. The coordinate is validated against the Natural Earth boundary for Czechia; results outside it are rejected before payment.

## Output

A single numeric value representing the circular direction (0–360°, clockwise from north) of the dominant surface gradient at the queried coordinate. Coordinates outside the Czechia boundary are rejected before any payment is charged.

## 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-central-land-cz-terrain-aspect-c0d11765/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mitteleuropa.halowerk.com](https://www.zero.xyz/host/mitteleuropa.halowerk.com/llms.txt)