# HALOWERK Southern Land – Portugal South-Facing Slope Orientation Index

> HALOWERK Southern Land – Portugal South-Facing Slope Orientation Index 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 a south-facing slope orientation index derived from aspect and slope for a given coordinate within Portugal.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/pt-solar-orientation
- 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-portugal-south-facing-slope-orientation-index-fc9bfc24
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rqdIzp_SlDNtAt9EZBEbV

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-portugal-south-facing-slope-orientation-index-fc9bfc24 -d '<json body>'
```

Example prompt: What's the south-facing slope orientation index for a plot at latitude 38.72, longitude -9.14 in Portugal — I want to know how well it faces south for solar exposure.

## When to prefer this

Use this endpoint when you need a Portugal-specific south-facing slope orientation index derived from aspect and slope data for a precise coordinate, particularly for solar energy siting, agricultural land selection, vineyard planning, or passive solar architecture within Portugal. It validates coordinates against the Natural Earth Portugal boundary before charging, making it safe for automated screening workflows.

## Known failure modes

- Coordinate outside Portugal boundary (Natural Earth) — request rejected before payment, error returned
- Latitude or longitude out of published European coverage range (34–72.5°N, -31.5–40.5°E) — validation error
- Malformed input JSON — schema validation error
- Service unavailability — HTTP 5xx error

## How this service works

South-facing slope orientation index derived from aspect and slope. The coordinate is validated against the Natural Earth boundary for Portugal; results outside it are rejected before payment.

## Output

A numeric south-facing slope orientation index derived from terrain aspect and slope at the submitted coordinate, indicating how strongly the terrain faces south. Coordinates outside the Portugal boundary per Natural Earth 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-southern-land-portugal-south-facing-slope-orientation-index-fc9bfc24/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)