# HALOWERK Atlantic Land – Belgium Maximum Surface Slope

> HALOWERK Atlantic Land – Belgium 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 the analysis grid for a given coordinate within Belgium.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/be-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-belgium-maximum-surface-slope-9afffcfd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gqnC94d1nz7hV_sKUmt5k

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-belgium-maximum-surface-slope-9afffcfd -d '<json body>'
```

Example prompt: What's the maximum surface slope gradient at latitude 50.65 and longitude 5.57 in Belgium? I need the steepest adjacent-cell terrain value for that location.

## When to prefer this

Use this endpoint when you need the peak (maximum) slope gradient rather than the mean slope at a Belgian location. Prefer it for worst-case terrain assessments such as construction feasibility, erosion risk, or machinery access evaluation where the steepest local gradient is the critical variable. Use the sibling mean-slope endpoint when you need average terrain steepness instead.

## Known failure modes

- Coordinate outside Belgium boundary — request rejected before payment with a validation error
- Latitude or longitude out of European coverage bounds (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Network timeout or service unavailability — no result returned
- Malformed or missing input parameters — request rejected with an error response

## How this service works

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

## Output

A numeric value representing the maximum adjacent-cell surface gradient (steepest slope) across the analysis grid centered on the provided coordinate, validated to fall within Belgian territory. Coordinates outside Belgium 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-atlantic-land-belgium-maximum-surface-slope-9afffcfd/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)