# HALOWERK Nordic Land – Local Relief (Sweden)

> HALOWERK Nordic Land – Local Relief (Sweden) 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 difference between maximum and minimum surface elevation (local relief) for a given WGS84 coordinate within Sweden.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/se-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-local-relief-sweden-9e5c1c55
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5jG3pv3dG3CAkj0vVYn4Y

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-local-relief-sweden-9e5c1c55 -d '<json body>'
```

Example prompt: What's the local relief — the difference between the highest and lowest surface elevation — at latitude 63.8, longitude 20.3 in Sweden?

## When to prefer this

Choose this endpoint when you need a fast, paid, per-point local relief value specifically for coordinates within Sweden. It is ideal when you need topographic roughness/amplitude as a scalar metric for site assessment, land classification, or environmental modeling. Prefer it over general elevation APIs when you specifically need the max-minus-min relief metric (not just elevation), and when your workflow requires Sweden-specific boundary validation before billing.

## Known failure modes

- Coordinate outside Sweden's Natural Earth boundary — request rejected before charge, returns a validation error
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Malformed or missing coordinate fields — returns a 400-level error
- Network timeout or service unavailability — returns a 5xx error

## How this service works

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

## Output

A numeric value representing the local relief in meters — the difference between the maximum and minimum sampled surface elevations within the analysis grid centered on the provided coordinate. Coordinates outside the Natural Earth boundary for Sweden 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-local-relief-sweden-9e5c1c55/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)