# HALOWERK Eastern Land – Hungary Grassland Share

> HALOWERK Eastern Land – Hungary Grassland 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 grassland for a given coordinate within Hungary.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/hu-grassland-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-grassland-share-5dabceab
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GMuXMhyi-ZPu8d2sU2U_T

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-grassland-share-5dabceab -d '<json body>'
```

Example prompt: What share of the land near latitude 47.49, longitude 19.08 in Hungary is classified as grassland according to ESA WorldCover 2021?

## When to prefer this

Use this endpoint when you need ESA WorldCover 2021 grassland land cover fraction specifically for points within Hungary. It is the right choice for agricultural suitability analysis, ecological surveys, habitat mapping, or land use studies focused on Hungarian territory. It performs boundary validation before charging, reducing wasted payments for off-target coordinates. Prefer this over general land cover APIs when you need a precise, per-point grassland share derived from a well-known 10 m resolution satellite product.

## Known failure modes

- Coordinate outside Hungary boundary — rejected before payment with a validation error
- Coordinate outside European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Missing or malformed latitude/longitude — request error
- Service unavailable or upstream ESA WorldCover data issue — server error

## How this service works

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

## Output

A numeric value representing the share (fraction or percentage) of ESA WorldCover 2021 pixels within the analysis grid around the given coordinate that are classified as grassland. Only coordinates validated as lying within the Hungary boundary are accepted; out-of-bounds coordinates 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-eastern-land-hungary-grassland-share-5dabceab/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)