# HALOWERK Southern Land – Greece Tree Cover Share

> HALOWERK Southern Land – Greece Tree Cover Share is a paid API for AI agents from suedland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

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

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/gr-tree-cover-share
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-southern-land-greece-tree-cover-share-c2154983
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6DS8iGsfRGm9k7p1JDpMg

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-southern-land-greece-tree-cover-share-c2154983 -d '<json body>'
```

Example prompt: What share of the land around latitude 37.98, longitude 23.73 in Greece is classified as tree cover according to ESA WorldCover 2021?

## When to prefer this

Use this endpoint when you need a pixel-level ESA WorldCover 2021 tree cover fraction specifically for a coordinate within Greece. It is preferable over generic land-cover APIs when Greece-specific boundary validation is required and when you need a standardised 2021-epoch tree cover metric rather than real-time or multi-temporal data. For other land cover classes (cropland, grassland) or soil/terrain attributes, use the sibling endpoints on the same platform.

## Known failure modes

- Coordinate outside Greece boundary → request rejected, no result returned
- Coordinate outside the European coverage bounding box (lat 34–72.5, lon -31.5–40.5) → validation error
- Invalid or missing latitude/longitude → input schema validation error
- Payment failure → 402 response before processing
- Service unavailability → 5xx error

## How this service works

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

## Output

A numeric share (fraction or percentage) representing how much of the ESA WorldCover 2021 analysis area around the given coordinate is classified as tree cover. The coordinate is validated against the Natural Earth boundary for Greece; coordinates outside Greece are rejected without charge.

## 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-southern-land-greece-tree-cover-share-c2154983/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suedland.halowerk.com](https://www.zero.xyz/host/suedland.halowerk.com/llms.txt)