# HALOWERK Nordic Land – Sweden Surface Aspect

> HALOWERK Nordic Land – Sweden Surface Aspect is a paid API for AI agents from nordland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Returns the circular direction of the dominant surface gradient (aspect) at a given coordinate within Sweden, measured clockwise from north in degrees.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/se-aspect
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-nordic-land-sweden-surface-aspect-c6b07794
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eP3AGj7xRfWM9XIXoJhWw

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-sweden-surface-aspect-c6b07794 -d '<json body>'
```

Example prompt: What direction does the slope face at latitude 63.2 longitude 18.4 in Sweden — give me the aspect angle clockwise from north.

## When to prefer this

Choose this endpoint when you need terrain aspect (slope-facing direction) specifically for coordinates within Sweden. It is pre-validated against Sweden's boundary so charges are only incurred for valid in-country queries. Prefer it over generic DEM APIs when working in a Nordic/Scandinavian geospatial pipeline that already uses HALOWERK's suite of soil and terrain endpoints.

## Known failure modes

- Coordinate outside Sweden's Natural Earth boundary — rejected before payment with a validation error
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — rejected with input validation error
- No-data areas (e.g. flat terrain with undefined aspect) may return null or a special code
- Network timeout or service unavailability returns a 5xx error

## How this service works

Circular direction of the dominant surface gradient, clockwise from north. The coordinate is validated against the Natural Earth boundary for Sweden; results outside it are rejected before payment.

## Output

A numeric value representing the dominant surface gradient direction in degrees, measured clockwise from north (0–360°), for the specified coordinate within Sweden. Coordinates outside Sweden's Natural Earth boundary are rejected before any charge is made.

## 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-sweden-surface-aspect-c6b07794/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)