# HALOWERK Europe Land – Tree Cover Share (250m Buffer)

> HALOWERK Europe Land – Tree Cover Share (250m Buffer) is a paid API for AI agents from euroland.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Returns the share of ESA WorldCover 2021 pixels classified as tree cover within a 250-metre circular buffer around a given European coordinate.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-tree-cover-share-buffer-250m
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-europe-land-tree-cover-share-250m-buffer-12dc55ee
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XTn_LCNY-p_wdMX6qwz_l

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-europe-land-tree-cover-share-250m-buffer-12dc55ee -d '<json body>'
```

Example prompt: What share of the land within 250 metres of latitude 48.8566, longitude 2.3522 in Paris is classified as tree cover according to ESA WorldCover?

## When to prefer this

Choose this endpoint when you need a localised, point-level tree cover estimate within a fixed 250-metre neighbourhood in Europe, using the standardised ESA WorldCover 2021 classification. It is ideal for per-site ecological assessments, environmental due diligence, or green infrastructure audits where a tight circular buffer matters more than a larger neighbourhood or a polygon-defined area. Prefer sibling endpoints if you need a different buffer size (e.g. 1,000m) or if you want to supply a custom polygon boundary instead of a coordinate.

## Known failure modes

- Coordinate outside European coverage bounds (latitude 34–72.5°N, longitude −31.5–40.5°E) returns an error or empty result
- Invalid or malformed latitude/longitude values rejected with a validation error
- Coordinate falls in an area not covered by any of the 30 supported countries
- Service unavailability or timeout under high load
- Payment failure via x402 protocol preventing request execution

## How this service works

Share of ESA WorldCover 2021 pixels classified as tree cover. The service evaluates a circular 250 metre neighborhood around one coordinate and returns standardized units across all 30 covered countries.

## Output

A standardized fractional or percentage value representing the share of ESA WorldCover 2021 pixels classified as tree cover within a 250-metre circular buffer around the submitted coordinate, covering any of 30 European countries.

## 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-europe-land-tree-cover-share-250m-buffer-12dc55ee/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from euroland.halowerk.com](https://www.zero.xyz/host/euroland.halowerk.com/llms.txt)