# HALOWERK Baltic Land – SoilGrids Coarse-Fragment Volume (0–5 cm, Poland)

> HALOWERK Baltic Land – SoilGrids Coarse-Fragment Volume (0–5 cm, Poland) 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 coarse-fragment volume (%) from SoilGrids for the 0–5 cm soil layer at a given coordinate within Poland's boundary.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/pl-soil-coarse-fragments
- 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-soilgrids-coarse-fragment-volume-0-5-cm-poland-d3075041
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XbDJLGJlINpdaVjoUgRdX

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-soilgrids-coarse-fragment-volume-0-5-cm-poland-d3075041 -d '<json body>'
```

Example prompt: What's the mean coarse-fragment volume in the top 5 cm of soil at latitude 52.23, longitude 21.01 in Poland? I need the SoilGrids value for that spot.

## When to prefer this

Choose this endpoint when you need point-level topsoil coarse-fragment data specifically within Poland and want a cost-effective per-call lookup ($0.004 USDC) with built-in boundary validation. Prefer it over raw SoilGrids API access when you need a pre-validated, pay-per-use microservice without managing SoilGrids authentication. Use sibling endpoints on baltikum.halowerk.com for complementary soil properties (clay, sand, bulk density) or terrain metrics at the same location.

## Known failure modes

- Coordinate outside Poland boundary — request rejected before payment with a boundary validation error
- Latitude or longitude out of the European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Malformed or missing coordinate fields — HTTP 400 bad request
- Service temporarily unavailable — HTTP 503
- Network timeout — no response returned within expected window

## How this service works

Mean SoilGrids coarse-fragment volume 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 coarse-fragment volume (volumetric %) derived from SoilGrids for the 0–5 cm soil layer at the requested coordinate. The coordinate is validated against Poland's Natural Earth boundary before processing; coordinates outside Poland are rejected prior to billing.

## 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-soilgrids-coarse-fragment-volume-0-5-cm-poland-d3075041/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)