# HALOWERK Nordic Land – SE Solar Orientation Index

> HALOWERK Nordic Land – SE Solar Orientation Index is a paid API for AI agents from nordland.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 data for a given coordinate within Sweden.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/se-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-nordic-land-se-solar-orientation-index-1df4f4ea
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BI-wGfieSsZrUZNg2d9BF

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-nordic-land-se-solar-orientation-index-1df4f4ea -d '<json body>'
```

Example prompt: What's the south-facing solar orientation index for the hillside at latitude 59.85, longitude 17.63 in Sweden — I want to know how well-oriented it is for solar panels.

## When to prefer this

Choose this endpoint when you need a quantitative solar orientation metric specifically for coordinates within Sweden, derived from aspect and slope. It is ideal for site-selection workflows, solar energy feasibility assessments, and land-use planning within the Nordic region. The built-in Sweden boundary validation ensures charges are only incurred for valid queries. Prefer this over generic elevation or aspect APIs when a single aggregated south-facing orientation index is needed for Swedish terrain.

## Known failure modes

- Coordinate outside Sweden's Natural Earth boundary — request rejected with boundary validation error, no charge applied
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Missing required latitude or longitude fields — request rejected with input validation error
- Coordinate in a data-sparse terrain area — may return null or low-confidence index
- Network timeout 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 Sweden; results outside it are rejected before payment.

## Output

A numeric south-facing slope orientation index derived from terrain aspect and slope at the queried coordinate. Coordinates outside Sweden's Natural Earth boundary are rejected before any charge is applied. The index indicates how optimally the slope faces south, useful for solar energy, agriculture, and land use planning.

## 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-nordic-land-se-solar-orientation-index-1df4f4ea/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nordland.halowerk.com](https://www.zero.xyz/host/nordland.halowerk.com/llms.txt)