# HALOWERK Land Compare – Topsoil Bulk Density (Two-Point)

> HALOWERK Land Compare – Topsoil Bulk Density (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).

Measures and compares topsoil bulk density at exactly two European WGS84 coordinates, returning the value for each location, the signed difference, and which location has higher bulk density.

## Facts

- Endpoint: POST https://landvergleich.halowerk.com/v1/compare-two-soil-bulk-density
- 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-bulk-density-two-point-f29740ec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_b9ByvA_e4p5QK9lc9mpph

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-bulk-density-two-point-f29740ec -d '<json body>'
```

Example prompt: Compare the topsoil bulk density between my two farm parcels — one at latitude 51.5, longitude 5.2 (call it 'North Field') and another at latitude 51.3, longitude 5.4 (call it 'South Field') — and tell me which has denser soil and by how much.

## When to prefer this

Choose this endpoint when you need a direct, methodologically consistent comparison of topsoil bulk density between exactly two European sites. It is ideal for agricultural plot selection, soil health assessments, or geospatial land evaluation tasks where you want a single-method, apples-to-apples comparison with a clear winner and signed difference — rather than raw single-point lookups or multi-site rankings which are handled by sibling endpoints.

## Known failure modes

- Coordinates outside European coverage bounds (lat 34–72.5, lon -31.5–40.5) will return an error
- Providing fewer or more than exactly two location objects will be rejected by schema validation
- Missing required latitude or longitude fields will cause a validation error
- Locations with very similar bulk density values may yield a near-zero difference with no clear winner
- Network or upstream data source unavailability may cause transient failures

## How this service works

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

## Output

Returns the measured topsoil bulk density value for each of the two input locations, the signed arithmetic difference between them (location A minus location B), and an indication of which location has the higher bulk density where the difference is meaningful. Values are derived from European soil datasets and cover WGS84 coordinates within the stated European bounding box.

## 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-bulk-density-two-point-f29740ec/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)