# HALOWERK Land Compare – Topsoil Silt

> HALOWERK Land Compare – Topsoil Silt 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 silt 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-silt
- 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-silt-50b21556
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_13Yz-geAPbIsG-wy3eVyV

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-silt-50b21556 -d '<json body>'
```

Example prompt: Compare the topsoil silt content between my two farm plots — one at latitude 51.5, longitude 5.2 (called 'North Field') and another at latitude 50.8, longitude 4.9 (called 'South Field') — and tell me which one has more silt and by how much.

## When to prefer this

Use this endpoint when you need a direct pairwise comparison of topsoil silt content between exactly two European locations. It is the right choice when the decision is binary (which of these two sites has more silt?) rather than ranking multiple sites or measuring a different soil property such as texture class or cation exchange capacity. Choose sibling endpoints for other soil attributes or for ranking more than two sites.

## Known failure modes

- Coordinates outside 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 array causes a schema validation error
- Missing required latitude or longitude fields returns a 400 bad request
- Network or upstream data unavailability may return a 503 or timeout
- Payment not fulfilled (x402) results in a 402 Payment Required response

## How this service works

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

## Output

Returns the topsoil silt measurement at both input coordinates, the signed numeric difference between them, and an indication of which location has the higher silt content (the 'winner'), or a note that no meaningful difference exists.

## 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-silt-50b21556/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)