# HALOWERK Nordic Land – Iceland Surface Aspect

> HALOWERK Nordic Land – Iceland 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 circular direction (clockwise from north) of the dominant surface gradient for a given coordinate within Iceland.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/is-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-iceland-surface-aspect-401e676b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_K4X-1KBJOstHCFcZqb-rV

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-iceland-surface-aspect-401e676b -d '<json body>'
```

Example prompt: What direction does the slope face at latitude 64.9, longitude -19.1 in Iceland — give me the aspect angle clockwise from north.

## When to prefer this

Choose this endpoint when you need terrain aspect data specifically for coordinates within Iceland, and you require pre-payment boundary validation to avoid wasteful charges for out-of-bounds points. Prefer it over generic terrain APIs when working within the HALOWERK Nordic Land ecosystem alongside sibling endpoints for slope, soil, and wetland data.

## Known failure modes

- Coordinate outside Iceland boundary: request rejected pre-payment with a boundary validation error
- Latitude or longitude outside published European coverage range: schema validation error
- Invalid coordinate format (non-numeric, null): input validation error
- 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 Iceland; results outside it are rejected before payment.

## Output

A numeric value representing the circular direction of the dominant surface gradient at the queried coordinate, measured in degrees clockwise from north (0–360°). Coordinates outside the Iceland boundary validated by Natural Earth are rejected before 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-iceland-surface-aspect-401e676b/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)