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

> HALOWERK Baltic Land – Poland Soil Silt 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 silt fraction for the 0–5 cm topsoil layer at a given coordinate within Poland, validated against the Natural Earth Poland boundary.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/pl-soil-silt
- 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-silt-fraction-0-5-cm-33f46906
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qR3TyoiMji0HdN5fxDLsv

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-silt-fraction-0-5-cm-33f46906 -d '<json body>'
```

Example prompt: What's the mean silt fraction in the top 5 cm of soil at latitude 52.23, longitude 21.01 in Poland?

## When to prefer this

Choose this endpoint when you need point-level topsoil silt fraction data specifically within Poland, with built-in boundary validation ensuring you only pay for valid in-country queries. Prefer it over generic soil APIs when working with Polish geospatial datasets or building land-use, agricultural, or environmental models focused on Poland.

## Known failure modes

- Coordinate outside Poland boundary — request rejected before payment, error indicating location is out of coverage
- Latitude or longitude outside the broad European range (34–72.5°N, -31.5–40.5°E) — validation error
- Missing latitude or longitude parameter — schema validation failure
- Network or upstream SoilGrids data unavailability — service error response
- Payment failure via x402 protocol — request not processed

## How this service works

Mean SoilGrids silt 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 value representing the mean silt fraction (likely as a proportion or percentage) in the 0–5 cm topsoil layer at the queried coordinate, sourced from SoilGrids. Coordinates outside the Poland boundary are rejected before any charge is applied.

## 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-silt-fraction-0-5-cm-33f46906/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)