# HALOWERK Land Compare – Tree-Cover Share (Two Sites)

> HALOWERK Land Compare – Tree-Cover Share (Two Sites) 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).

Measures and compares tree-cover share for exactly two European coordinates, returning the signed difference and identifying which location has greater tree coverage.

## Facts

- Endpoint: POST https://landvergleich.halowerk.com/v1/compare-two-tree-cover-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-tree-cover-share-two-sites-9048c25f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xGJzcvP_wLad-hKTux-J5

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-tree-cover-share-two-sites-9048c25f -d '<json body>'
```

Example prompt: Compare the tree-cover share between the Black Forest in Germany (longitude 8.2, latitude 48.1) and the Landes Forest in France (longitude -1.0, latitude 44.3) — which one has higher tree coverage and by how much?

## When to prefer this

Choose this endpoint when you need a direct, method-consistent pairwise comparison of tree-cover share at exactly two European locations — ideal for site selection, environmental baseline reporting, or green-space due diligence. Prefer it over generic land-cover endpoints when tree canopy or forest density is specifically the metric of interest, and over multi-site ranking endpoints when you need only two sites compared with a clear winner and signed difference.

## Known failure modes

- Coordinates outside European coverage bounds (latitude 34–72.5, longitude -31.5–40.5) will be rejected
- Fewer or more than exactly two location objects will fail validation
- Missing required longitude or latitude fields returns a schema validation error
- Network or service unavailability returns a timeout or 5xx error
- Payment failure via x402 protocol prevents the call from being processed

## How this service works

Measures tree-cover share for exactly two European coordinates with one method and reports the signed difference and winner where meaningful.

## Output

Returns the measured tree-cover share (as a percentage or fraction) for each of the two input European coordinates, the signed arithmetic difference between them, and an indication of which location 'wins' (has greater tree coverage) where meaningful — all derived from a single consistent measurement method.

## 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-tree-cover-share-two-sites-9048c25f/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)