# HALOWERK Nordic Land – Sweden Surface Elevation

> HALOWERK Nordic Land – Sweden Surface Elevation 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 bilinear-interpolated surface elevation (meters) for a WGS84 coordinate inside Sweden, derived from Copernicus DEM GLO-30, with boundary validation against Natural Earth Sweden polygon.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/se-elevation
- 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-sweden-surface-elevation-a8eca2aa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7qv2Ft1ESlSjMqu2RPVge

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-sweden-surface-elevation-a8eca2aa -d '<json body>'
```

Example prompt: What's the surface elevation at latitude 59.33 and longitude 18.07 in Sweden — I need it in meters from the Copernicus DEM data.

## When to prefer this

Choose this endpoint when you need precise point-level surface elevation data specifically within Sweden, backed by the high-resolution Copernicus DEM GLO-30 (~30m posting). It is ideal when boundary enforcement (rejecting non-Sweden coordinates before billing) is important, and when bilinear interpolation quality is preferred over nearest-neighbor. Use over generic global DEM APIs when Sweden-specific validation and per-call micropayment via x402 fit your workflow.

## Known failure modes

- Coordinate outside Sweden boundary: rejected before payment with a boundary validation error
- Coordinate outside overall European coverage range (lat 34–72.5, lon -31.5–40.5): rejected with validation error
- Malformed or missing latitude/longitude fields: returns schema validation error
- DEM data gap at queried location: may return null or error for the elevation value
- Network timeout or service unavailability: returns 5xx error

## How this service works

Bilinear surface elevation from Copernicus DEM GLO-30. The coordinate is validated against the Natural Earth boundary for Sweden; results outside it are rejected before payment.

## Output

Returns the bilinearly interpolated surface elevation in meters for the given WGS84 coordinate, sourced from the Copernicus DEM GLO-30 dataset. Coordinates outside the Natural Earth boundary for Sweden 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-sweden-surface-elevation-a8eca2aa/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)