# HALOWERK Southern Land – Greece Solar Orientation Index

> HALOWERK Southern Land – Greece Solar 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 Greece.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/gr-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-greece-solar-orientation-index-ae35a31a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Xozscmhk8zB2qsKTM0qZr

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-solar-orientation-index-ae35a31a -d '<json body>'
```

Example prompt: What's the south-facing slope orientation index for the site at latitude 37.98, longitude 23.73 in Greece? I need to assess it for solar panel placement.

## When to prefer this

Use this endpoint when you need a fast, affordable per-point solar orientation index specifically for locations within Greece. It is ideal for site screening workflows involving solar energy, agriculture, or land assessment where south-facing slope quality matters and coordinates are already known. Prefer this over general elevation APIs when you specifically need an aspect-and-slope composite oriented toward solar exposure within the Greece coverage area.

## Known failure modes

- Coordinate outside Greece boundary — rejected with validation error before payment
- Latitude or longitude outside published European range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Malformed or missing latitude/longitude — 400 bad request
- Service unavailable or upstream DEM data error — 5xx response

## How this service works

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

## Output

A numerical south-facing slope orientation index derived from the aspect and slope of the terrain at the given coordinate. Coordinates are validated against the Natural Earth boundary for Greece; requests outside Greece 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-greece-solar-orientation-index-ae35a31a/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)