# HALOWERK Nordic Land – DK Surface Aspect

> HALOWERK Nordic Land – DK 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 2026-09-15).

Returns the dominant surface aspect (circular slope direction, clockwise from north) for a given coordinate within Denmark, validated against the Natural Earth boundary.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/dk-aspect
- 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-dk-surface-aspect-19e4923a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bNZEtcWLgVtPh5gC_9jws

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-dk-surface-aspect-19e4923a -d '<json body>'
```

Example prompt: What's the dominant surface aspect — the slope direction clockwise from north — at latitude 55.85 and longitude 9.72 in Denmark?

## When to prefer this

Choose this endpoint when you need terrain aspect (slope orientation) specifically for coordinates within Denmark, especially when boundary validation before billing is important. Prefer it over generic elevation APIs when you need the directional gradient (not just slope magnitude) and need Danish-boundary enforcement built in. Complements sibling endpoints on the same platform for full terrain and soil characterisation.

## Known failure modes

- Coordinate outside Denmark's Natural Earth boundary — rejected with an error before payment is charged
- Latitude or longitude outside the accepted European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Invalid or missing latitude/longitude — schema validation failure
- Network timeout or service unavailability — HTTP 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 Denmark; results outside it are rejected before payment.

## Output

Returns the dominant surface aspect as a circular direction in degrees (0–360), measured clockwise from north, representing the orientation of the steepest downslope gradient at the queried coordinate. Coordinates outside Denmark'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-dk-surface-aspect-19e4923a/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)