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

> HALOWERK Eastern Land – Croatia 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 for the 0-5 cm topsoil layer at a given coordinate within Croatia.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/hr-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-croatia-soil-cec-0-5-cm-d8cd0238
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gBnRZ1isuNtKEvs8DHuXn

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-croatia-soil-cec-0-5-cm-d8cd0238 -d '<json body>'
```

Example prompt: What's the SoilGrids cation exchange capacity for the top 0-5 cm of soil at latitude 45.56, longitude 17.23 in Croatia?

## When to prefer this

Choose this endpoint when you need a fast, pay-per-call lookup of SoilGrids topsoil cation exchange capacity specifically for a point coordinate within Croatia, and want built-in boundary validation so out-of-region requests are rejected before incurring charges. Prefer it over generic SoilGrids API access when you only need CEC at 0-5 cm depth and want a minimal, cost-effective micro-API with x402 payment integration.

## Known failure modes

- Coordinate outside Croatia's Natural Earth boundary — request rejected before payment
- Latitude or longitude outside European coverage bounds (34–72.5°N, -31.5–40.5°E) — validation error
- Malformed JSON body or missing required fields — 400 error
- Payment failure or insufficient USDC balance — 402 error
- SoilGrids upstream data unavailable for remote or coastal edge pixels — null or error response

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

## Output

A numeric mean cation exchange capacity value (in cmolc/kg) derived from SoilGrids for the 0-5 cm soil depth at the queried coordinate, restricted to validated points within Croatia's Natural Earth boundary.

## 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-croatia-soil-cec-0-5-cm-d8cd0238/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)