# HALOWERK Central Land – Slovakia Soil CEC 0-5 cm

> HALOWERK Central Land – Slovakia Soil CEC 0-5 cm is a paid API for AI agents from mitteleuropa.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-13).

Returns the mean SoilGrids cation exchange capacity (CEC) for the 0-5 cm soil layer at a given coordinate within Slovakia.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/sk-soil-cec
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-central-land-slovakia-soil-cec-0-5-cm-6f203d73
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MX43RqYxdema_BJS_T3OZ

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-central-land-slovakia-soil-cec-0-5-cm-6f203d73 -d '<json body>'
```

Example prompt: What's the mean cation exchange capacity for the top 5 cm of soil at latitude 48.7 and longitude 18.3 in Slovakia?

## When to prefer this

Use this endpoint when you need authoritative SoilGrids CEC data specifically for soil locations within Slovakia and want boundary validation (non-Slovak coordinates are rejected). Prefer this over generic SoilGrids API access when you need a low-cost, pay-per-call micro-API with built-in geographic validation for the Slovak territory.

## Known failure modes

- Coordinate outside Slovakia boundary — request rejected with validation error before payment
- Coordinate outside the European coverage bounding box (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Missing or malformed latitude/longitude — HTTP 400 bad request
- Service unavailable or upstream SoilGrids data unreachable — HTTP 5xx error

## How this service works

Mean SoilGrids cation exchange capacity for the 0-5 cm layer. The coordinate is validated against the Natural Earth boundary for Slovakia; results outside it are rejected before payment.

## Output

A numeric value representing the mean cation exchange capacity (CEC) in cmolc/kg for the 0-5 cm topsoil layer at the queried coordinate, sourced from SoilGrids. Coordinates outside the Slovakia boundary are rejected before any result is returned.

## 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-central-land-slovakia-soil-cec-0-5-cm-6f203d73/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mitteleuropa.halowerk.com](https://www.zero.xyz/host/mitteleuropa.halowerk.com/llms.txt)