# HALOWERK Central Land – Maximum Surface Slope (Liechtenstein)

> HALOWERK Central Land – Maximum Surface Slope (Liechtenstein) 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 maximum adjacent-cell surface gradient across a local analysis grid for a coordinate within Liechtenstein, derived from Copernicus DEM GLO-30 data.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/li-max-slope
- 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-maximum-surface-slope-liechtenstein-06418ad1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oo1A_xyQ7stioz_KYtJAG

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-maximum-surface-slope-liechtenstein-06418ad1 -d '<json body>'
```

Example prompt: What's the maximum surface slope at the coordinate 47.14° N, 9.52° E in Liechtenstein — I need the steepest adjacent-cell gradient value for that location.

## When to prefer this

Use this endpoint when you need the maximum adjacent-cell surface slope for a specific point within Liechtenstein, as opposed to mean slope or slope direction. It is ideal for terrain steepness analysis, risk assessment, and land suitability workflows scoped specifically to Liechtenstein. Prefer this over general DEM APIs when boundary validation against Liechtenstein is required.

## Known failure modes

- Coordinate outside Liechtenstein boundary — rejected with an error before payment
- Latitude or longitude out of valid European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Malformed or missing coordinate fields — request rejected
- Network timeout or service unavailability — no result returned

## How this service works

Maximum adjacent-cell surface gradient across the analysis grid. The coordinate is validated against the Natural Earth boundary for Liechtenstein; results outside it are rejected before payment.

## Output

A numerical value representing the maximum adjacent-cell surface gradient (steepest slope) across the local analysis grid at the queried coordinate, expressed as a gradient measure. Coordinates outside the Liechtenstein boundary are rejected before processing.

## 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-maximum-surface-slope-liechtenstein-06418ad1/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)