# HALOWERK Baltic Land – Estonia Soil Coarse-Fragment Volume (0–5 cm)

> HALOWERK Baltic Land – Estonia Soil Coarse-Fragment Volume (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 coarse-fragment volume percentage for the 0–5 cm soil layer at a given WGS84 coordinate within Estonia.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/ee-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-estonia-soil-coarse-fragment-volume-0-5-cm-481f685a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IIFFmBIlDKMohANanZR_i

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-estonia-soil-coarse-fragment-volume-0-5-cm-481f685a -d '<json body>'
```

Example prompt: What is the mean coarse-fragment volume in the top 5 cm of soil at latitude 58.5850, longitude 25.0136 in Estonia?

## When to prefer this

Choose this endpoint when you need point-level coarse-fragment (gravel/rock) volume data specifically for Estonian locations using SoilGrids-derived values. It is preferable over general-purpose soil APIs when you require pre-validated Estonia-boundary enforcement and a low per-call cost via x402 micropayment. Use it alongside sibling endpoints (clay fraction, sand fraction, bulk density) for comprehensive soil profile analysis.

## Known failure modes

- Coordinate outside Estonia boundary — request rejected with validation error and no charge
- Latitude or longitude out of European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Invalid or missing coordinate fields — 400-level error
- Service unavailable or upstream SoilGrids data issue — 5xx error

## 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 Estonia; results outside it are rejected before payment.

## Output

A numeric value representing the mean volumetric coarse-fragment (gravel/stones) content as a percentage in the 0–5 cm topsoil layer at the requested coordinate, derived from SoilGrids. Requests outside Estonia's 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-estonia-soil-coarse-fragment-volume-0-5-cm-481f685a/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)