# HALOWERK Southern Land – Greece Water & Wetland Share

> HALOWERK Southern Land – Greece Water & Wetland 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 combined share of permanent water, herbaceous wetland, and mangrove land-cover classes at a given coordinate within Greece, derived from ESA WorldCover 2021.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/gr-water-wetland-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-water-wetland-share-8f55af0e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XWVZOPf6v9k7PnwkbVYiC

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-water-wetland-share-8f55af0e -d '<json body>'
```

Example prompt: What's the combined share of permanent water, wetland, and mangrove cover at latitude 37.97 and longitude 23.73 in Greece according to the HALOWERK Southern Land data?

## When to prefer this

Use this endpoint when you need ESA WorldCover 2021-derived water and wetland coverage fractions specifically for a point location within Greece. It is ideal for environmental due diligence, land suitability screening, habitat assessments, or any workflow requiring quantified wetland presence at a Greek coordinate. It is distinct from cropland, grassland, or soil endpoints on the same platform. Prefer this over general GIS APIs when you need a pre-validated, pay-per-call lookup without standing up your own raster processing pipeline.

## Known failure modes

- Coordinate outside Greece boundary: rejected before processing, no result returned
- Latitude or longitude outside published European coverage range (lat 34–72.5, lon -31.5–40.5): validation error
- Malformed or missing coordinate fields: schema validation error
- Payment failure: x402 payment not completed, request blocked
- Coordinate on sea or border edge with ambiguous country attribution: may be rejected

## How this service works

Combined share of permanent water, herbaceous wetland and mangrove classes. 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 the combined proportion of ESA WorldCover 2021 pixels classified as permanent water, herbaceous wetland, and mangrove within the analysis area around the submitted coordinate. The coordinate is validated against the Natural Earth boundary for Greece before the result is returned.

## 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-water-wetland-share-8f55af0e/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)