# HALOWERK Central Land – Slovakia Maximum Surface Slope

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

Returns the maximum adjacent-cell surface gradient (steepest slope) across the analysis grid for a given coordinate within Slovakia.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/sk-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-slovakia-maximum-surface-slope-1b3ac229
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8_MzmkcwMGvWxhjkug0tO

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-slovakia-maximum-surface-slope-1b3ac229 -d '<json body>'
```

Example prompt: What's the maximum surface slope at latitude 48.85, longitude 19.20 in Slovakia — I need the steepest adjacent-cell gradient across the analysis grid for that point.

## When to prefer this

Use this endpoint when you specifically need the maximum (steepest) adjacent-cell slope gradient for a location within Slovakia, as opposed to mean slope or elevation. Prefer this over generic elevation services when terrain steepness extremes matter — e.g. erosion risk, construction feasibility, or route planning — and when the target coordinate falls within Slovakia.

## Known failure modes

- Coordinates outside Slovakia boundary rejected before payment — returns a boundary validation error
- Coordinates outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) are invalid
- Malformed or missing latitude/longitude fields return a schema validation error
- Ambiguous or non-numeric coordinate values result in a parse error

## How this service works

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

## Output

A numeric value representing the maximum adjacent-cell surface gradient (slope) across the analysis grid centered on the given coordinate. The coordinate is validated against the Natural Earth boundary for Slovakia, and requests outside this boundary are rejected before any charge is made.

## 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-slovakia-maximum-surface-slope-1b3ac229/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)