# HALOWERK Southern Land – Greece Maximum Slope

> HALOWERK Southern Land – Greece Maximum Slope is a paid API for AI agents from suedland.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 Greece.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/gr-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-southern-land-greece-maximum-slope-cf2e769b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__0A3vQ8_HTGPj1jon0FiL

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-southern-land-greece-maximum-slope-cf2e769b -d '<json body>'
```

Example prompt: What's the maximum surface slope at latitude 37.98, longitude 23.73 in Greece? I need the steepest adjacent-cell gradient for that location.

## When to prefer this

Use this endpoint when you need the steepest slope value at a specific point within Greece, particularly for land suitability assessments, agricultural planning, erosion risk analysis, or construction feasibility checks. It is specifically validated against the Greek boundary, so it is more appropriate than generic slope APIs when Greece-specific results and boundary enforcement are required.

## Known failure modes

- Coordinate outside Greece boundary — request rejected before payment with a validation error
- Latitude or longitude outside the published European coverage range — schema validation failure
- Invalid or missing coordinates — 400-level error returned
- Service unavailability or timeout — 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 Greece; 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. Coordinates outside the Natural Earth boundary for Greece 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-southern-land-greece-maximum-slope-cf2e769b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suedland.halowerk.com](https://www.zero.xyz/host/suedland.halowerk.com/llms.txt)