# HALOWERK Central Land – Slovenia Maximum Slope

> HALOWERK Central Land – Slovenia Maximum Slope is a paid API for AI agents from mitteleuropa.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Returns the maximum adjacent-cell surface gradient across a local analysis grid for a given WGS84 coordinate within Slovenia.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/si-max-slope
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-central-land-slovenia-maximum-slope-6c3e8320
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ePSy5x-uEHV96h3kyxAOI

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-slovenia-maximum-slope-6c3e8320 -d '<json body>'
```

Example prompt: What is the maximum adjacent-cell surface slope at latitude 46.05, longitude 14.50 in Slovenia?

## When to prefer this

Choose this endpoint when you need the peak (maximum) slope gradient at a specific point within Slovenia, as opposed to mean slope (available on a sibling endpoint). It is ideal for worst-case terrain steepness assessments such as erosion modelling, landslide risk screening, trail difficulty evaluation, or construction suitability — where the steepest micro-gradient in the neighborhood matters most.

## Known failure modes

- Coordinate outside Slovenia boundary — request rejected before payment with a boundary validation error
- Latitude or longitude outside the European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Missing required latitude or longitude parameter — input validation error
- Payment failure via x402 protocol — request not processed
- Temporary service unavailability — HTTP 5xx error

## How this service works

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

## Output

A numeric value representing the maximum adjacent-cell surface gradient (slope) across the local analysis grid centered on the provided coordinate, derived from high-resolution DEM data. Coordinates outside Slovenia's Natural Earth boundary are rejected before any charge is incurred.

## 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-slovenia-maximum-slope-6c3e8320/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)