# HALOWERK Land Compare – Topsoil Clay Two-Point Comparison

> HALOWERK Land Compare – Topsoil Clay Two-Point Comparison 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 topsoil clay content at exactly two European coordinates and returns the signed difference plus the winning location.

## Facts

- Endpoint: POST https://landvergleich.halowerk.com/v1/compare-two-soil-clay
- 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-topsoil-clay-two-point-comparison-daa6cec8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7wR5GR_VFCzpmmrK1-1nM

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-topsoil-clay-two-point-comparison-daa6cec8 -d '<json body>'
```

Example prompt: Compare the topsoil clay content between my two plots — one at 48.8566°N, 2.3522°E (Paris field) and one at 52.5200°N, 13.4050°E (Berlin field) — and tell me which has more clay and by how much.

## When to prefer this

Use this endpoint when you need a focused, authoritative clay-content comparison between exactly two European land sites in a single call. It is more precise than general soil lookup tools because it is purpose-built for pairwise European topsoil clay comparison and directly returns the signed delta and winner, saving post-processing steps. Prefer it over multi-site ranking endpoints when you have exactly two locations and need a direct head-to-head clay result.

## Known failure modes

- Coordinates outside the European coverage bounds (latitude 34–72.5°N, longitude -31.5–40.5°E) return a validation error
- Fewer or more than exactly two locations in the request body cause a schema validation failure
- Missing required latitude or longitude fields return a 400-level error
- Ambiguous or identical coordinates may yield a zero difference with no clear winner

## How this service works

Measures topsoil clay for exactly two European coordinates with one method and reports the signed difference and winner where meaningful.

## Output

Returns the topsoil clay measurement for each of the two input coordinates, the signed numerical difference between them, and an indication of which location has the higher clay content where the difference is meaningful.

## 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-topsoil-clay-two-point-comparison-daa6cec8/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)