# HALOWERK Nordic Land – Terrain Ruggedness (Iceland)

> HALOWERK Nordic Land – Terrain Ruggedness (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 the standard deviation of sampled surface elevations as a terrain ruggedness index for a WGS84 coordinate within Iceland's boundary.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/is-ruggedness
- 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-terrain-ruggedness-iceland-586601cf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tdwqYqph85AdQLQdeqAVR

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-terrain-ruggedness-iceland-586601cf -d '<json body>'
```

Example prompt: What's the terrain ruggedness score for the point at latitude 64.9, longitude -18.1 in Iceland? I need the elevation standard deviation from the surface sampling.

## When to prefer this

Choose this endpoint when you need a precise, pay-per-call terrain ruggedness metric (elevation standard deviation) for a specific point within Iceland, especially when working within an agentic pipeline that already handles x402 micropayments. It is purpose-built for Iceland coordinates with boundary validation, making it more reliable than general-purpose DEM APIs that may not enforce geographic scope or charge only for valid results.

## Known failure modes

- Coordinate outside Iceland's Natural Earth boundary — request rejected before payment, error returned
- Latitude or longitude out of the accepted European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed input (missing or non-numeric coordinates) — schema validation error
- Service unavailable or timeout — HTTP 5xx response

## How this service works

Standard deviation of sampled surface elevations. The coordinate is validated against the Natural Earth boundary for Iceland; results outside it are rejected before payment.

## Output

A numeric value representing the standard deviation of sampled surface elevations at the given coordinate, serving as a terrain ruggedness index. Coordinates outside Iceland's Natural Earth boundary are rejected before the computation and payment is not charged.

## 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-terrain-ruggedness-iceland-586601cf/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)