# HALOWERK Nordic Land – Denmark Local Relief

> HALOWERK Nordic Land – Denmark Local Relief 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 local relief (max minus min surface elevation) for a WGS84 coordinate within Denmark, computed from sampled elevation data.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/dk-local-relief
- 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-denmark-local-relief-3da7c4c2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qXHDxcPb-MDKPZAF6bV4-

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-denmark-local-relief-3da7c4c2 -d '<json body>'
```

Example prompt: What's the local terrain relief — the difference between the highest and lowest sampled elevation — at latitude 55.68 and longitude 12.57 in Denmark?

## When to prefer this

Choose this endpoint when you need a single-point local terrain relief metric specifically within Denmark and want a pre-validated, pay-per-call service that rejects out-of-boundary coordinates before charging. Prefer it over general-purpose elevation APIs when you need the elevation range (max minus min) rather than a single elevation value, and when working within the Nordic/Denmark geographic scope covered by the HALOWERK Nordic Land dataset.

## Known failure modes

- Coordinate outside Denmark boundary — request rejected before payment with a validation error
- Latitude or longitude out of European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- No elevation data available for the coordinate — possible sparse coverage error
- Network timeout or service unavailability — HTTP 5xx response
- Invalid JSON body or missing required fields — HTTP 400 bad request

## How this service works

Difference between maximum and minimum sampled surface elevation. The coordinate is validated against the Natural Earth boundary for Denmark; results outside it are rejected before payment.

## Output

A numeric value representing the local relief in metres — the difference between the maximum and minimum sampled surface elevation within the analysis grid centred on the provided coordinate. Coordinates outside Denmark's Natural Earth boundary are rejected before any charge is incurred.

## 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-denmark-local-relief-3da7c4c2/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)