# HALOWERK Eastern Land – Bulgaria Grassland Share

> HALOWERK Eastern Land – Bulgaria 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 at a given coordinate within Bulgaria.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/bg-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-bulgaria-grassland-share-4cfcc249
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_z4TqA_YjzA-xq4KRxqWMn

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-grassland-share-4cfcc249 -d '<json body>'
```

Example prompt: What share of land near latitude 42.15, longitude 24.75 in Bulgaria is classified as grassland according to ESA WorldCover 2021?

## When to prefer this

Use this endpoint when you need pixel-level ESA WorldCover 2021 grassland fraction specifically for a point within Bulgaria. It is ideal for land-use analysis, agricultural assessments, habitat mapping, or environmental reporting tasks scoped to Bulgaria, and it validates coordinates against Bulgaria's boundary before charging, reducing wasted calls.

## Known failure modes

- Coordinate outside Bulgaria boundary — rejected before payment with a validation error
- Coordinate outside European coverage bounds (lat 34–72.5, lon -31.5–40.5) — rejected as out-of-range
- Invalid or missing latitude/longitude fields — schema validation error
- Payment failure via x402 protocol — call not processed

## How this service works

Share of ESA WorldCover 2021 pixels classified as grassland. 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 queried coordinate classified as grassland, validated to be 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-grassland-share-4cfcc249/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)