# HALOWERK Nordic Land – Denmark Soil Cation Exchange Capacity (0-5 cm)

> HALOWERK Nordic Land – Denmark Soil Cation Exchange Capacity (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 2026-09-13).

Returns the mean SoilGrids cation exchange capacity (CEC) for the 0–5 cm topsoil layer at a given WGS84 coordinate validated to lie within Denmark.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/dk-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-nordic-land-denmark-soil-cation-exchange-capacity-0-5-cm-41c8f250
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cn21mp8po1QBECiI2a712

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-denmark-soil-cation-exchange-capacity-0-5-cm-41c8f250 -d '<json body>'
```

Example prompt: What's the mean cation exchange capacity of the topsoil at latitude 55.676, longitude 12.568 in Denmark — I need the SoilGrids 0-5 cm CEC value for that spot.

## When to prefer this

Choose this endpoint when you specifically need SoilGrids-derived mean CEC for the 0–5 cm topsoil layer at a point location within Denmark. It is ideal for agricultural, environmental, or geospatial workflows requiring standardised, boundary-validated soil nutrient-retention data for Danish coordinates. Use sibling endpoints on the same platform for other soil properties (pH, organic carbon, texture class) or for elevation and terrain metrics.

## Known failure modes

- Coordinate outside Denmark boundary — request rejected before payment is processed
- Latitude or longitude out of the published European coverage range (34–72.5°N, -31.5–40.5°E) — validation error
- Invalid or missing coordinate fields — schema validation failure
- SoilGrids upstream data unavailable for the queried location — no-data 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 Denmark; results outside it are rejected before payment.

## Output

A numeric mean cation exchange capacity value (cmolc/kg or equivalent SoilGrids unit) for the 0–5 cm soil layer at the requested coordinate, derived from SoilGrids data and validated to be within Denmark'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-nordic-land-denmark-soil-cation-exchange-capacity-0-5-cm-41c8f250/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)