# HALOWERK Land Compare: Water & Wetland Share (Two Points)

> HALOWERK Land Compare: Water & Wetland Share (Two Points) is a paid API for AI agents from landvergleich.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Compares water and wetland land-cover share at exactly two European coordinates, returning the signed difference and which location has the higher share.

## Facts

- Endpoint: POST https://landvergleich.halowerk.com/v1/compare-two-water-wetland-share
- 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-land-compare-water-wetland-share-two-points-ee800d65
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oDGkuqn96WtRSjT9ArB6n

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-land-compare-water-wetland-share-two-points-ee800d65 -d '<json body>'
```

Example prompt: Compare the water and wetland land-cover share between the Camargue wetlands in France (4.63°E, 43.52°N) and the Danube Delta in Romania (29.60°E, 45.15°N) — which one has a higher share and by how much?

## When to prefer this

Use this endpoint when you need a fast, structured pairwise comparison of water and wetland land-cover share between exactly two European points, especially when the signed difference and clear winner are needed for decision-making. Prefer it over general geospatial APIs when you want pre-computed ESA-derived wetland fractions without building your own raster analysis pipeline. Choose sibling endpoints for soil, terrain, built-up, or tree-cover comparisons.

## Known failure modes

- Coordinates outside the European coverage bounding box (lat 34–72.5°N, lon -31.5–40.5°E) will be rejected
- Fewer or more than exactly two locations provided returns a validation error
- Malformed or missing latitude/longitude fields cause a schema error
- Payment not provided or insufficient triggers a 402 response
- Locations in very low-data or coastal edge zones may return null or uncertain share values

## How this service works

Measures water and wetland share for exactly two European coordinates with one method and reports the signed difference and winner where meaningful.

## Output

Returns the measured water and wetland share percentage for each of the two input coordinates, the signed difference (location A minus location B), and an indication of which location has the higher share (the winner), based on European land-cover data.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "locations": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "longitude",
     "latitude"
    ],
    "properties": {
     "name": {
      "type": "string",
      "maxLength": 60,
      "minLength": 1
     },
     "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."
     }
    },
    "additionalProperties": false
   },
   "maxItems": 2,
   "minItems": 2
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-land-compare-water-wetland-share-two-points-ee800d65/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from landvergleich.halowerk.com](https://www.zero.xyz/host/landvergleich.halowerk.com/llms.txt)