# HALOWERK Europe Land – Solar Orientation Index (250m Buffer)

> HALOWERK Europe Land – Solar Orientation Index (250m Buffer) is a paid API for AI agents from euroland.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Returns a south-facing slope orientation index for a 250-metre circular neighborhood around a given European coordinate, derived from terrain aspect and slope data.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-solar-orientation-buffer-250m
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-europe-land-solar-orientation-index-250m-buffer-21b96477
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aPKd_O2rl45LPIhSy6j1n

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-europe-land-solar-orientation-index-250m-buffer-21b96477 -d '<json body>'
```

Example prompt: What's the south-facing slope orientation index for the 250-metre area around latitude 47.5, longitude 8.2 in Europe — I need to know if this site has good solar exposure.

## When to prefer this

Choose this endpoint when you need a standardized, aspect-and-slope-derived solar orientation metric for a specific European point at 250-metre neighborhood resolution. It is ideal for site suitability scoring, solar energy feasibility, and terrain analysis tasks across any of the 30 covered European countries. Prefer the 60m buffer sibling endpoint when finer local resolution is needed.

## Known failure modes

- Coordinates outside the European coverage bounds (lat 34–72.5, lon -31.5–40.5) return an error or empty result
- Invalid or non-numeric latitude/longitude values cause a validation error
- Coordinates in the ocean or non-land areas may return null or no-data values
- Payment failure via x402 protocol prevents response
- Service unavailability returns a 5xx error

## How this service works

South-facing slope orientation index derived from aspect and slope. The service evaluates a circular 250 metre neighborhood around one coordinate and returns standardized units across all 30 covered countries.

## Output

A standardized numeric south-facing slope orientation index representing the degree to which terrain within a 250-metre circular buffer around the supplied coordinate faces south, derived from aspect and slope data. Covers all 30 European countries in uniform units.

## 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-europe-land-solar-orientation-index-250m-buffer-21b96477/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from euroland.halowerk.com](https://www.zero.xyz/host/euroland.halowerk.com/llms.txt)