# HALOWERK Eastern Land – Croatia Tree Cover Share

> HALOWERK Eastern Land – Croatia Tree Cover Share is a paid API for AI agents from ostland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Returns the share of ESA WorldCover 2021 pixels classified as tree cover for a given coordinate within Croatia.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/hr-tree-cover-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-eastern-land-croatia-tree-cover-share-297cffce
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PcYd7LspGcyEJzCmiLsGW

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-croatia-tree-cover-share-297cffce -d '<json body>'
```

Example prompt: What's the ESA WorldCover tree cover share at latitude 45.23, longitude 15.87 in Croatia?

## When to prefer this

Choose this endpoint when you need ESA WorldCover 2021 tree cover fraction specifically for a point location within Croatia. It is ideal for land analysis pipelines, environmental assessments, or agricultural screening workflows that require satellite-derived forest coverage data validated against official Croatian boundaries. Prefer it over generic land cover APIs when Croatian geographic scope and ESA WorldCover 2021 classification specifically are required.

## Known failure modes

- Coordinate outside Croatia boundary — request rejected before payment with a boundary validation error
- Coordinate within European coverage range but outside Croatia — rejected by Natural Earth boundary check
- Malformed or missing latitude/longitude — validation error returned
- Latitude or longitude outside published European bounds (34–72.5°N, -31.5–40.5°E) — schema validation failure
- Network or upstream data service unavailability — server error response

## How this service works

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

## Output

A numeric share (fraction or percentage) of ESA WorldCover 2021 pixels at the queried coordinate classified as tree cover, validated to be within Croatia's Natural Earth boundary. Coordinates outside Croatia 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-eastern-land-croatia-tree-cover-share-297cffce/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)