# HALOWERK Eastern Land – Bulgaria Tree Cover Share

> HALOWERK Eastern Land – Bulgaria 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 2026-09-15).

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

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/bg-tree-cover-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-bulgaria-tree-cover-share-36d1e5ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GzNDtfo_vNxUsDQqHMv1B

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-bulgaria-tree-cover-share-36d1e5ed -d '<json body>'
```

Example prompt: What share of ESA WorldCover 2021 pixels are classified as tree cover at latitude 42.15, longitude 24.75 in Bulgaria?

## When to prefer this

Use this endpoint when you need ESA WorldCover 2021 tree cover fraction specifically for a point coordinate within Bulgaria. It is purpose-built for Bulgarian land analysis with built-in boundary validation, making it more reliable than a generic land cover API for Bulgarian coordinates. Prefer it over broader European or global land cover services when you need Bulgaria-scoped results with automatic coordinate rejection for out-of-bounds queries.

## Known failure modes

- Coordinate outside Bulgaria's Natural Earth boundary — request rejected before payment is processed
- Latitude or longitude out of the published European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Invalid input types for latitude or longitude — schema validation failure
- Payment failure via x402 protocol — call not executed

## How this service works

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

## Output

A numeric share (fraction or percentage) of ESA WorldCover 2021 pixels at the given coordinate classified as tree cover, validated to lie within Bulgaria's Natural Earth boundary.

## 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-bulgaria-tree-cover-share-36d1e5ed/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)