# HALOWERK Nordic Land – Solar Orientation Index (Iceland)

> HALOWERK Nordic Land – Solar Orientation Index (Iceland) 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 for a given coordinate in Iceland, validated against the Natural Earth Iceland boundary.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/is-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-solar-orientation-index-iceland-6cd7cef1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pp2u4W-S9wErLgMHxU9I4

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-solar-orientation-index-iceland-6cd7cef1 -d '<json body>'
```

Example prompt: What's the south-facing solar orientation index for the location at 64.13°N, 21.94°W in Iceland? I want to know how well-oriented that slope is for capturing sunlight.

## When to prefer this

Choose this endpoint when you need a terrain-derived solar orientation score specifically for locations within Iceland. It is ideal for solar site assessment, land-use planning, agricultural suitability analysis, or passive solar building siting in Iceland. Unlike generic elevation or aspect APIs, it combines aspect and slope into a single south-facing orientation index and enforces Iceland-boundary validation, making it reliable and cost-efficient for Iceland-scoped workflows.

## Known failure modes

- Coordinate outside Iceland boundary — request rejected before payment with a boundary validation error
- Latitude or longitude out of the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Malformed or missing coordinate parameters — input validation error
- Network or service timeout — retry recommended
- Payment failure via x402 protocol — transaction not completed, result not returned

## How this service works

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

## Output

A numeric south-facing slope orientation index derived from terrain aspect and slope angle for the queried Icelandic coordinate. Returns a computed score indicating how favorably oriented the surface is toward the south for solar exposure. Coordinates outside the Natural Earth boundary for Iceland are rejected before any payment is processed.

## 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-solar-orientation-index-iceland-6cd7cef1/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)