# HALOWERK Nordic Land – South-Facing Slope Orientation Index

> HALOWERK Nordic Land – South-Facing Slope 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 terrain aspect and slope for a given coordinate within Norway.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/no-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-south-facing-slope-orientation-index-7ba75f77
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pY9cSBUdG6gSxpRcTUN3p

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-south-facing-slope-orientation-index-7ba75f77 -d '<json body>'
```

Example prompt: What's the south-facing slope orientation index for the location at latitude 60.35, longitude 8.75 in Norway? I need to know how well-oriented this hillside is for solar exposure.

## When to prefer this

Choose this endpoint when you need a terrain-derived solar orientation metric specifically for Norwegian coordinates. It is ideal for renewable energy siting, agricultural planning, or any land analysis workflow where south-facing slope matters in Norway. It is distinct from raw DEM elevation or land cover endpoints and includes built-in boundary validation to prevent charges for out-of-scope coordinates.

## Known failure modes

- Coordinate outside Norway boundary – request rejected before payment, no charge incurred
- Latitude or longitude outside published European coverage range (lat 34–72.5, lon -31.5–40.5) – validation error
- Malformed or missing coordinate fields – 400 bad request
- Payment failure via x402 protocol – 402 payment required

## How this service works

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

## Output

A numeric south-facing slope orientation index derived from the terrain's aspect and slope at the given coordinate. Higher values indicate stronger south-facing orientation. Coordinates outside Norway's Natural Earth boundary 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-nordic-land-south-facing-slope-orientation-index-7ba75f77/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)