# HALOWERK Nordic Land – Sweden Soil Cation Exchange Capacity (CEC) 0–5 cm

> HALOWERK Nordic Land – Sweden Soil Cation Exchange Capacity (CEC) 0–5 cm is a paid API for AI agents from nordland.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 validated within Sweden's boundaries.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/se-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-nordic-land-sweden-soil-cation-exchange-capacity-cec-0-5-cm-28ae9e01
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_n6KslS5D1fB8soIpR52qQ

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-nordic-land-sweden-soil-cation-exchange-capacity-cec-0-5-cm-28ae9e01 -d '<json body>'
```

Example prompt: What's the cation exchange capacity of the topsoil at latitude 59.33 and longitude 18.07 in Sweden? I need the SoilGrids 0–5 cm CEC value for that point.

## When to prefer this

Choose this endpoint when you need a fast, pay-per-call SoilGrids CEC topsoil reading validated specifically for Sweden, without building your own SoilGrids pipeline. It is ideal for agents enriching agricultural, ecological, or land-use datasets with soil fertility indicators at point locations inside Sweden. Prefer it over raw SoilGrids API access when boundary validation, micropayment billing, and a simple POST interface are desirable.

## Known failure modes

- Coordinate outside Sweden boundary – request rejected, no charge applied
- Latitude or longitude outside the declared European coverage range (lat 34–72.5, lon -31.5–40.5) – validation error
- Missing required latitude or longitude field – schema validation error
- SoilGrids data unavailable for the queried cell – may return null or error response
- Network timeout or upstream SoilGrids service outage – 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 Sweden; 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 Sweden's Natural Earth boundary are rejected before any charge is incurred.

## 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-nordic-land-sweden-soil-cation-exchange-capacity-cec-0-5-cm-28ae9e01/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nordland.halowerk.com](https://www.zero.xyz/host/nordland.halowerk.com/llms.txt)