# HALOWERK Atlantic Land – Luxembourg Maximum Surface Slope

> HALOWERK Atlantic Land – Luxembourg Maximum Surface Slope is a paid API for AI agents from atlantikland.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 an analysis grid for a given coordinate within Luxembourg.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/lu-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-atlantic-land-luxembourg-maximum-surface-slope-b1338ca4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_N174glgKxHwqwfxg9p9wp

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-atlantic-land-luxembourg-maximum-surface-slope-b1338ca4 -d '<json body>'
```

Example prompt: What is the maximum surface slope gradient at latitude 49.6116, longitude 6.1319 in Luxembourg? I need the steepest adjacent-cell terrain gradient for that location.

## When to prefer this

Choose this endpoint when you need the maximum (worst-case) slope gradient at a specific location within Luxembourg, particularly for terrain ruggedness, construction feasibility, agricultural suitability, or runoff risk assessments. Use this over mean slope endpoints when the steepest local gradient matters more than the average slope — for example in safety-critical engineering or erosion studies.

## Known failure modes

- Coordinate outside Luxembourg boundary — request rejected with validation error before payment
- Latitude or longitude out of European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Malformed or missing coordinate parameters — 400-level error
- Network timeout or service unavailability — 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 Luxembourg; results outside it are rejected before payment.

## Output

Returns the maximum adjacent-cell surface slope gradient value across the analysis grid centered on the submitted coordinate. The coordinate must fall within the Natural Earth boundary of Luxembourg; requests outside this boundary are rejected before any charge is applied.

## 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-atlantic-land-luxembourg-maximum-surface-slope-b1338ca4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from atlantikland.halowerk.com](https://www.zero.xyz/host/atlantikland.halowerk.com/llms.txt)