# HALOWERK Baltic Land – Maximum Surface Slope (Germany)

> HALOWERK Baltic Land – Maximum Surface Slope (Germany) is a paid API for AI agents from baltikum.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 the analysis grid for a given coordinate within Germany.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/de-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-baltic-land-maximum-surface-slope-germany-1e6dfc8b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fyCOUxGXSsMjLciIgjuVR

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-baltic-land-maximum-surface-slope-germany-1e6dfc8b -d '<json body>'
```

Example prompt: What is the maximum surface slope gradient at latitude 48.137, longitude 11.576 in Germany? I need the steepest adjacent-cell terrain gradient for that location.

## When to prefer this

Choose this endpoint when you need a precise maximum adjacent-cell slope gradient specifically for a point location within Germany, particularly for site assessments, erosion analysis, hydrological modeling, or construction planning. It is preferable when Germany-bounded validation is required and you need a single scalar gradient metric rather than a full elevation profile or multi-country dataset.

## Known failure modes

- Coordinate outside Germany boundary — rejected before payment with a validation error
- Latitude or longitude out of the accepted European coverage range (lat 34–72.5, lon -31.5–40.5) — returns a 400-class error
- Malformed or missing input parameters — returns a schema validation error
- Payment failure via x402 protocol — request not fulfilled

## How this service works

Maximum adjacent-cell surface gradient across the analysis grid. The coordinate is validated against the Natural Earth boundary for Germany; 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 queried coordinate within Germany. Coordinates outside the German 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-baltic-land-maximum-surface-slope-germany-1e6dfc8b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from baltikum.halowerk.com](https://www.zero.xyz/host/baltikum.halowerk.com/llms.txt)