# HALOWERK Baltic Land – Poland Water & Wetland Share

> HALOWERK Baltic Land – Poland Water & Wetland 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 combined share of permanent water, herbaceous wetland, and mangrove land-cover classes for a given WGS84 coordinate within Poland's boundaries.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/pl-water-wetland-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-water-wetland-share-4294f675
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GiDmHZUiHSzY64S-BOUcZ

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-water-wetland-share-4294f675 -d '<json body>'
```

Example prompt: What's the combined water and wetland land-cover share at latitude 52.23, longitude 21.01 in Poland?

## When to prefer this

Choose this endpoint when you need a precise, pay-per-call lookup of water and wetland land-cover share for a specific point within Poland, backed by ESA WorldCover 2021 classifications. It is ideal for environmental due diligence, flood risk screening, biodiversity assessments, or any geospatial workflow that requires hydrological land-cover fractions at the coordinate level without spinning up a full GIS stack. The built-in Poland boundary validation prevents wasted payments on out-of-scope coordinates.

## Known failure modes

- Coordinate outside Poland's Natural Earth boundary — request rejected before payment, no charge incurred
- Coordinate outside the broader European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Missing or malformed latitude/longitude fields — schema validation error
- Upstream land-cover data unavailable for edge-case coordinates — service error response

## How this service works

Combined share of permanent water, herbaceous wetland and mangrove classes. The coordinate is validated against the Natural Earth boundary for Poland; results outside it are rejected before payment.

## Output

A numeric share (fraction 0–1 or percentage) representing the combined proportion of permanent water, herbaceous wetland, and mangrove pixels within the analysis area around the given coordinate in Poland. Coordinates outside Poland's Natural Earth boundary are rejected before payment is processed.

## 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-water-wetland-share-4294f675/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)