# HALOWERK Baltic Land – Poland Tree Cover Share

> HALOWERK Baltic Land – Poland Tree Cover 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 tree cover for a given coordinate within Poland.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/pl-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-baltic-land-poland-tree-cover-share-378452f4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SDzEEl0WoYX_jM6U80CNW

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-tree-cover-share-378452f4 -d '<json body>'
```

Example prompt: What share of the land around 52.23°N, 21.01°E in Poland is classified as tree cover according to ESA WorldCover 2021?

## When to prefer this

Choose this endpoint when you need tree cover land fraction specifically for a point in Poland derived from ESA WorldCover 2021 satellite data. It is ideal for environmental assessments, forestry analysis, land use studies, and habitat mapping workflows scoped to Poland. The pre-payment boundary validation ensures you are not charged for out-of-scope coordinates.

## Known failure modes

- Coordinate outside Poland boundary — request rejected before payment with a boundary validation error
- Coordinate within European coverage range but outside Poland — rejected by Natural Earth boundary check
- Missing or malformed latitude/longitude — validation error returned
- Coordinate outside the declared European coverage envelope (lat 34–72.5, lon -31.5–40.5) — rejected

## How this service works

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

## Output

A numeric value representing the share (fraction or percentage) of ESA WorldCover 2021 pixels classified as tree cover within the analysis area around the provided coordinate. The coordinate must fall within Poland's boundary as defined by Natural Earth; requests outside Poland are rejected before any charge is applied.

## 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-tree-cover-share-378452f4/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)