# HALOWERK Southern Land – South-Facing Slope Orientation Index (Spain)

> HALOWERK Southern Land – South-Facing Slope Orientation Index (Spain) is a paid API for AI agents from suedland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Returns a south-facing slope orientation index derived from terrain aspect and slope for a given coordinate within Spain.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/es-solar-orientation
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-southern-land-south-facing-slope-orientation-index-spain-b71d1282
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NX4jGH4_6XAMAHxWFkTdB

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-south-facing-slope-orientation-index-spain-b71d1282 -d '<json body>'
```

Example prompt: What's the south-facing slope orientation index for the plot at latitude 40.2 and longitude -3.7 in Spain? I want to know how suitable it is for solar exposure.

## When to prefer this

Choose this endpoint when you need a terrain solar orientation index specifically for coordinates within Spain, particularly for site suitability assessments involving south-facing slopes (solar farms, vineyards, orchards, or reforestation). It is ideal for land evaluation workflows that require aspect-slope characterisation without running full GIS pipelines. The pre-payment boundary validation for Spain ensures you are not charged for out-of-scope coordinates.

## Known failure modes

- Coordinate outside Spain's Natural Earth boundary — request rejected before payment, validation error returned
- Latitude or longitude out of accepted European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Malformed or missing coordinate fields — input validation error
- Network or 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 Spain; results outside it are rejected before payment.

## Output

A numeric south-facing slope orientation index computed from the terrain's aspect and slope at the specified coordinate, indicating how strongly the land faces south. Coordinates outside the Spain boundary (validated against 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-south-facing-slope-orientation-index-spain-b71d1282/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)