# HALOWERK Eastern Land – Hungary Soil CEC (0-5 cm)

> HALOWERK Eastern Land – Hungary Soil CEC (0-5 cm) is a paid API for AI agents from ostland.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).

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

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/hu-soil-cec
- 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-eastern-land-hungary-soil-cec-0-5-cm-21561240
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nkGIK7VPdy3Jb6qEo9k2Y

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-eastern-land-hungary-soil-cec-0-5-cm-21561240 -d '<json body>'
```

Example prompt: What's the mean cation exchange capacity of the topsoil (0–5 cm) at latitude 47.49 and longitude 19.04 in Hungary?

## When to prefer this

Choose this endpoint when you specifically need SoilGrids-derived CEC data for the 0–5 cm topsoil layer at a point within Hungary. It is distinct from generic European coverage endpoints because it applies Hungary-specific boundary validation, making it reliable for Hungarian land assessment workflows. Prefer it over raw SoilGrids API access when you want a simple, paid-per-call interface without managing API keys.

## Known failure modes

- Coordinate outside Hungary boundary — request rejected before processing
- Latitude or longitude out of the published European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed or missing coordinate fields — schema validation failure
- Payment failure via x402 — call not processed
- Upstream SoilGrids data unavailable for very remote or uncovered cells

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

## Output

A numeric mean cation exchange capacity (CEC) value in cmolc/kg for the 0–5 cm soil depth at the queried coordinate, derived from the SoilGrids dataset. Coordinates outside Hungary's Natural Earth boundary are rejected without a result.

## 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-eastern-land-hungary-soil-cec-0-5-cm-21561240/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ostland.halowerk.com](https://www.zero.xyz/host/ostland.halowerk.com/llms.txt)