# HALOWERK Southern Land – Greece Soil Cation Exchange Capacity (0–5 cm)

> HALOWERK Southern Land – Greece Soil Cation Exchange Capacity (0–5 cm) is a paid API for AI agents from suedland.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 topsoil layer at a given WGS84 coordinate within Greece.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/gr-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-southern-land-greece-soil-cation-exchange-capacity-0-5-cm-9672260f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0GjlX4DkkgKPAuStb9Usj

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-southern-land-greece-soil-cation-exchange-capacity-0-5-cm-9672260f -d '<json body>'
```

Example prompt: What's the mean cation exchange capacity of the topsoil at latitude 37.9838, longitude 23.7275 in Greece — I need the SoilGrids 0–5 cm CEC value for that spot.

## When to prefer this

Use this endpoint when you need a precise, point-level SoilGrids CEC value for the 0–5 cm topsoil layer specifically within Greece, and want built-in boundary validation so out-of-area requests fail cheaply before billing. Prefer it over general soil data APIs when Greece-scoped validation and micro-pricing per call matter.

## Known failure modes

- Coordinate outside Greece boundary: request rejected before payment, no result returned
- Latitude or longitude out of the published European coverage range: validation error
- Missing or malformed latitude/longitude: schema validation failure
- Service unavailable or upstream SoilGrids data issue: server 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 Greece; results outside it are rejected before payment.

## Output

A numeric value representing the mean cation exchange capacity (CEC, in cmolc/kg) of the 0–5 cm topsoil layer at the queried coordinate, derived from SoilGrids data. Coordinates outside the Greece 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-southern-land-greece-soil-cation-exchange-capacity-0-5-cm-9672260f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suedland.halowerk.com](https://www.zero.xyz/host/suedland.halowerk.com/llms.txt)