# HALOWERK Southern Land – Malta Mean Slope

> HALOWERK Southern Land – Malta Mean 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 mean first-order surface gradient (slope) across an analysis grid for a coordinate point in Malta.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/mt-mean-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-malta-mean-slope-81d1fd3c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Y2nCfdsD-wsPADh83ymk4

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-malta-mean-slope-81d1fd3c -d '<json body>'
```

Example prompt: What is the mean surface slope at latitude 35.92, longitude 14.45 in Malta? I need the average first-order gradient for that location.

## When to prefer this

Use this endpoint when you specifically need mean terrain slope at a point location within Malta, such as for land suitability analysis, agricultural planning, solar siting, civil engineering, or erosion modeling. It is preferable over general-purpose elevation APIs when you need a precomputed mean gradient rather than raw elevation, and when your analysis is scoped to Malta.

## Known failure modes

- Coordinate outside Malta boundary — rejected with validation error before payment
- Coordinate within European coverage range but outside Malta polygon — rejected
- Missing or invalid latitude/longitude values — schema validation error
- Coordinate at sea or non-land area — may be rejected or return null
- Service unavailable / payment failure via x402 protocol

## How this service works

Mean first-order surface gradient across the analysis grid. The coordinate is validated against the Natural Earth boundary for Malta; results outside it are rejected before payment.

## Output

A numeric value representing the mean first-order surface gradient (slope) computed across an analysis grid centered on the provided coordinate within Malta. Coordinates outside the Malta boundary are rejected before the call is billed.

## 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-malta-mean-slope-81d1fd3c/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)