# HALOWERK Baltic Land – Poland Soil Bulk Density (0-5 cm)

> HALOWERK Baltic Land – Poland Soil Bulk Density (0-5 cm) is a paid API for AI agents from baltikum.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).

Returns the mean SoilGrids bulk density for the 0–5 cm topsoil layer at a given WGS84 coordinate, validated against the Natural Earth boundary for Poland.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/pl-soil-bulk-density
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-baltic-land-poland-soil-bulk-density-0-5-cm-cabbb871
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4nl8UZr-t1X8KHG6EhrFS

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-baltic-land-poland-soil-bulk-density-0-5-cm-cabbb871 -d '<json body>'
```

Example prompt: What is the SoilGrids mean bulk density of the 0–5 cm topsoil layer at latitude 52.2297, longitude 21.0122 in Poland?

## When to prefer this

Use this endpoint when you need SoilGrids topsoil bulk density specifically for a location within Poland, and want boundary-validated results with per-call micropayment pricing. Prefer it over direct SoilGrids API calls when you need guaranteed coordinate rejection outside Poland and don't want to manage authentication or spatial validation yourself.

## Known failure modes

- Coordinate outside Poland boundary: request rejected before payment, no result returned
- Coordinate outside European coverage range (lat 34–72.5, lon -31.5–40.5): validation error
- Missing or malformed latitude/longitude: schema validation error
- SoilGrids data unavailable for remote or unmapped location: may return null or error

## How this service works

Mean SoilGrids bulk density for the 0-5 cm layer. The coordinate is validated against the Natural Earth boundary for Poland; results outside it are rejected before payment.

## Output

Returns the mean bulk density value (g/cm³ or cg/cm³ as per SoilGrids convention) for the 0–5 cm topsoil layer at the queried coordinate. If the coordinate falls outside the validated Poland boundary, the request is rejected before payment is processed.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "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."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-baltic-land-poland-soil-bulk-density-0-5-cm-cabbb871/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from baltikum.halowerk.com](https://www.zero.xyz/host/baltikum.halowerk.com/llms.txt)