# HALOWERK Central Land – Slovakia Surface Elevation

> HALOWERK Central Land – Slovakia Surface Elevation is a paid API for AI agents from mitteleuropa.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Returns bilinear-interpolated surface elevation from Copernicus DEM GLO-30 for a WGS84 coordinate within Slovakia's boundaries.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/sk-elevation
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-central-land-slovakia-surface-elevation-164016e1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FADlfdtLN3JNPpfXPBfsO

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-central-land-slovakia-surface-elevation-164016e1 -d '<json body>'
```

Example prompt: What is the surface elevation at latitude 48.71 and longitude 19.15 in Slovakia, using the Copernicus DEM data?

## When to prefer this

Choose this endpoint when you need precise, satellite-derived surface elevation data specifically for coordinates within Slovakia. It is ideal when you require Copernicus GLO-30 quality (approximately 30-meter resolution) with built-in boundary validation so out-of-country requests are rejected cheaply. Prefer it over generic elevation APIs when working with Slovak geospatial pipelines, land analysis, agriculture, or infrastructure projects where DEM accuracy and boundary enforcement matter.

## Known failure modes

- Coordinate outside Slovakia's Natural Earth boundary — request rejected, no charge applied
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed or missing latitude/longitude fields — input schema validation failure
- Payment failure via x402 protocol — request not processed
- Service unavailable or upstream DEM data unreachable — server error

## How this service works

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

## Output

Returns a bilinear-interpolated surface elevation value in meters derived from the Copernicus DEM GLO-30 dataset for the queried coordinate. Coordinates outside Slovakia's Natural Earth boundary are rejected before any charge is applied.

## 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-central-land-slovakia-surface-elevation-164016e1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mitteleuropa.halowerk.com](https://www.zero.xyz/host/mitteleuropa.halowerk.com/llms.txt)