# HALOWERK Eastern Land – Hungary Built-Up Area Share

> HALOWERK Eastern Land – Hungary Built-Up Area Share is a paid API for AI agents from ostland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the share of ESA WorldCover 2021 pixels classified as built-up (urban/developed land) for a given coordinate within Hungary.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/hu-built-up-share
- 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-eastern-land-hungary-built-up-area-share-467dfb17
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wAzpazCUuaDX2550U15fv

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-eastern-land-hungary-built-up-area-share-467dfb17 -d '<json body>'
```

Example prompt: What share of the land is classified as built-up around coordinates 47.4979° N, 19.0402° E in Hungary according to ESA WorldCover 2021?

## When to prefer this

Use this endpoint when you need a precise, satellite-derived built-up land cover fraction for a specific point inside Hungary, sourced from ESA WorldCover 2021. Prefer it over generic geocoding or population-density APIs when you need pixel-level land classification rather than administrative or census data. Its pre-payment boundary validation avoids wasted charges for out-of-scope coordinates.

## Known failure modes

- Coordinate outside Hungary's Natural Earth boundary — request rejected with no charge
- Coordinate outside the broader European coverage bounds (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed or missing latitude/longitude fields — schema validation error
- Payment failure — x402 payment not completed, request not processed

## How this service works

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

## Output

A numeric share (fraction or percentage) representing the proportion of ESA WorldCover 2021 pixels in the analysis grid around the queried coordinate that are classified as built-up/developed land. Coordinates outside Hungary's Natural Earth boundary are rejected before any payment is charged.

## 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-eastern-land-hungary-built-up-area-share-467dfb17/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ostland.halowerk.com](https://www.zero.xyz/host/ostland.halowerk.com/llms.txt)