# HALOWERK Land Compare – Topsoil Coarse Fragments (Two-Point)

> HALOWERK Land Compare – Topsoil Coarse Fragments (Two-Point) 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 coarse fragment content at exactly two European coordinates and returns the signed difference plus a winner designation.

## Facts

- Endpoint: POST https://landvergleich.halowerk.com/v1/compare-two-soil-coarse-fragments
- 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-coarse-fragments-two-point-feba091a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uz9aPIGG8gdOHfqxc1UBx

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-coarse-fragments-two-point-feba091a -d '<json body>'
```

Example prompt: Compare the topsoil coarse fragment content between a vineyard at 44.2°N, 7.8°E in Italy and a field at 48.6°N, 2.3°E in France — which site has rockier topsoil and by how much?

## When to prefer this

Use this endpoint when you need a direct, quantitative comparison of topsoil coarse fragment content between exactly two European sites. It is purpose-built for the two-point pairwise comparison use case with a clear winner output, unlike single-point soil lookups or multi-site ranking endpoints. Choose it over the sibling multi-site ranking endpoint when you only have two locations and want a signed difference rather than a ranked list.

## Known failure modes

- Coordinates outside European coverage bounds (latitude 34–72.5°N, longitude -31.5–40.5°E) will be rejected
- Fewer or more than exactly two locations in the request will fail schema validation
- Missing required latitude or longitude fields cause a validation error
- Locations in non-terrestrial areas (ocean, sea) may return null or no-data responses
- Network or upstream data-source outages may cause timeouts or 5xx errors

## How this service works

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

## Output

Returns the topsoil coarse fragment measurement for each of the two input coordinates (expressed as a percentage or volumetric share), the signed arithmetic difference between them, and an indication of which location 'wins' (i.e. has higher coarse fragment 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-coarse-fragments-two-point-feba091a/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)