# HALOWERK Baltic Land – Poland Grassland Share

> HALOWERK Baltic Land – Poland Grassland Share is a paid API for AI agents from baltikum.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 Poland's boundary.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/pl-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-baltic-land-poland-grassland-share-6948945f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FhIAVYyakoKhf4WyA8rWm

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-baltic-land-poland-grassland-share-6948945f -d '<json body>'
```

Example prompt: What share of the land around coordinates 51.9°N, 19.1°E in Poland is classified as grassland according to ESA WorldCover 2021?

## When to prefer this

Choose this endpoint when you need ESA WorldCover 2021 grassland land-cover fractions specifically for locations within Poland, and want boundary validation to catch out-of-scope coordinates before incurring cost. Prefer it over generic land-cover APIs when Poland-specific geographic validation is required.

## Known failure modes

- Coordinate outside Poland boundary — rejected before payment with a validation error
- Latitude or longitude outside the European coverage range (lat 34–72.5, lon -31.5–40.5) — rejected as invalid input
- Malformed request body or missing required fields — returns a 4xx error
- Coordinate technically inside Europe but outside Poland — rejected by Natural Earth boundary check

## How this service works

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

## Output

A numeric value representing the fraction (share) of ESA WorldCover 2021 pixels classified as grassland within the analysis area surrounding the input coordinate, validated to lie within Poland's 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-baltic-land-poland-grassland-share-6948945f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from baltikum.halowerk.com](https://www.zero.xyz/host/baltikum.halowerk.com/llms.txt)