# HALOWERK Baltic Land – Poland Soil Sand Fraction (0-5 cm)

> HALOWERK Baltic Land – Poland Soil Sand Fraction (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 sand fraction for the 0–5 cm soil layer at a given coordinate within Poland, rejecting points outside the Polish boundary before charging.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/pl-soil-sand
- 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-sand-fraction-0-5-cm-75204d0e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_E_5B_QcelMoaVDGDg1798

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-sand-fraction-0-5-cm-75204d0e -d '<json body>'
```

Example prompt: What's the SoilGrids sand fraction for the top 0–5 cm of soil at latitude 52.2297, longitude 21.0122 in Poland?

## When to prefer this

Use this endpoint when you need point-level topsoil sand fraction data specifically for locations within Poland and want automatic boundary validation before incurring a charge. Prefer it over generic SoilGrids API access when you need a lightweight, pay-per-call lookup with built-in Poland geofencing and no infrastructure overhead.

## Known failure modes

- Coordinate outside Poland boundary — request rejected before payment with a boundary validation error
- Coordinate within European coverage range but outside Poland — returns rejection, no charge
- Latitude or longitude out of the accepted European range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- SoilGrids data unavailable for requested cell — may return null or error value
- Malformed request body — HTTP 400 bad request

## How this service works

Mean SoilGrids sand fraction 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

A numeric mean sand fraction value (as measured by SoilGrids) for the 0–5 cm soil layer at the requested coordinate within Poland. The coordinate is first validated against the Natural Earth Poland boundary; requests outside Poland are rejected before any 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-sand-fraction-0-5-cm-75204d0e/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)