# HALOWERK Southern Land – Greece Grassland Share

> HALOWERK Southern Land – Greece Grassland Share is a paid API for AI agents from suedland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the share of ESA WorldCover 2021 pixels classified as grassland within the analysis area around a given coordinate in Greece.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/gr-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-southern-land-greece-grassland-share-3a0045d3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__cmFggM45-Bws8KpRR_ZA

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-grassland-share-3a0045d3 -d '<json body>'
```

Example prompt: What fraction of land around latitude 37.9, longitude 23.7 in Greece is classified as grassland according to ESA WorldCover 2021?

## When to prefer this

Choose this endpoint when you need ESA WorldCover 2021-based grassland land cover fractions specifically for locations within Greece. It is ideal for agricultural suitability assessment, environmental reporting, or land use analysis workflows that require authoritative satellite-derived grassland coverage data at a point level. It differs from sibling endpoints covering cropland share, dominant land cover class, or soil properties — use this one specifically for grassland fraction queries in Greece.

## Known failure modes

- Coordinate outside Greece's Natural Earth boundary — request rejected before payment is processed
- Latitude or longitude out of the accepted European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Invalid or missing coordinate fields — schema validation failure
- Service unavailable or upstream ESA WorldCover data unreachable — server error

## How this service works

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

## Output

A numeric value representing the share (fraction or percentage) of ESA WorldCover 2021 pixels classified as grassland within the analysis area surrounding the given coordinate. The coordinate must fall within the validated boundary of Greece; requests outside it are rejected.

## 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-grassland-share-3a0045d3/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)