# HALOWERK Nordic Land – Finland Surface Aspect

> HALOWERK Nordic Land – Finland 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 gradient direction (aspect) in degrees clockwise from north for a given coordinate within Finland.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/fi-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-finland-surface-aspect-88d1f61d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ESJkgRqrpkvglPqoSuwAg

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-finland-surface-aspect-88d1f61d -d '<json body>'
```

Example prompt: What direction does the terrain face at latitude 61.5, longitude 25.3 in Finland? I need the surface aspect angle clockwise from north.

## When to prefer this

Use this endpoint when you need terrain aspect (slope-facing direction) specifically for coordinates within Finland. It is ideal when you need precise, validated geospatial terrain data for Finnish locations without risk of paying for out-of-boundary queries. Prefer it over general-purpose DEM services when Finland-specific boundary validation and micropayment-per-call pricing are acceptable.

## Known failure modes

- Coordinate outside Finland boundary: rejected before payment, returns validation error
- Coordinate within Europe but outside Finland: boundary check fails, no result returned
- Malformed or out-of-range latitude/longitude values: schema validation error
- Network or service unavailability: HTTP error response

## How this service works

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

## Output

A numeric value representing the circular direction of the dominant surface gradient in degrees clockwise from north (0–360°) for the queried Finnish coordinate. Coordinates outside Finland'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-finland-surface-aspect-88d1f61d/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)