# HALOWERK Central Land – Slovakia Built-Up Land Share

> HALOWERK Central Land – Slovakia Built-Up Land Share 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 the share of ESA WorldCover 2021 pixels classified as built-up (urban/impervious surface) for a given coordinate within Slovakia.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/sk-built-up-share
- 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-built-up-land-share-685daa09
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_i4d75wTUtqYbdve7zkA6e

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-built-up-land-share-685daa09 -d '<json body>'
```

Example prompt: What share of ESA WorldCover 2021 pixels around latitude 48.1486 and longitude 17.1077 in Slovakia are classified as built-up?

## When to prefer this

Use this endpoint when you need ESA WorldCover 2021–derived built-up land share specifically for a point within Slovakia, with built-in boundary validation ensuring the coordinate is inside the country before any charge is incurred. Prefer it over generic land-cover APIs when you need satellite-derived impervious surface fractions with per-call micropayment pricing and guaranteed Slovak territorial scope.

## Known failure modes

- Coordinate outside Slovakia boundary rejected before payment — returns an error indicating the point failed the Natural Earth Slovakia boundary check
- Coordinate outside the broader European coverage range (lat 34–72.5, lon -31.5–40.5) returns a validation error
- Malformed or missing latitude/longitude fields return a schema validation error
- Service unavailable or upstream WorldCover data access failure returns a 5xx error

## How this service works

Share of ESA WorldCover 2021 pixels classified as built-up. The coordinate is validated against the Natural Earth boundary for Slovakia; results outside it are rejected before payment.

## Output

A numeric share (fraction or percentage) representing the proportion of ESA WorldCover 2021 raster pixels within the analysis neighborhood classified as built-up (impervious/urban), for the validated coordinate inside Slovakia.

## 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-built-up-land-share-685daa09/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)