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

> HALOWERK Nordic Land – Iceland 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 2026-09-15).

Returns the mean SoilGrids cation exchange capacity (CEC) for the 0–5 cm soil layer at a given coordinate validated against Iceland's boundary.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/is-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-iceland-soil-cation-exchange-capacity-0-5-cm-9f108ab3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iGGrtuCUKxYVx-JaMPn0i

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-iceland-soil-cation-exchange-capacity-0-5-cm-9f108ab3 -d '<json body>'
```

Example prompt: What's the mean cation exchange capacity of the soil at latitude 64.1355, longitude -21.8954 in Iceland — just the 0 to 5 cm surface layer?

## When to prefer this

Choose this endpoint when you specifically need SoilGrids-derived mean cation exchange capacity for the 0–5 cm topsoil layer at a point location within Iceland. Prefer it over generic soil APIs when you need validated, boundary-checked results for Iceland and require per-call micropayment pricing via x402. Use sibling endpoints on the same domain for other soil properties (pH, organic carbon, sand/clay fractions) at the same location.

## Known failure modes

- Coordinate outside Iceland boundary — request rejected before payment is charged
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Invalid coordinate format — type error
- Network or service unavailability — HTTP 5xx
- Payment failure — x402 payment required 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 Iceland; results outside it are rejected before payment.

## Output

A numeric mean cation exchange capacity value (cmolc/kg) for the 0–5 cm topsoil layer at the queried coordinate, derived from SoilGrids data. Returns an error or rejection if the coordinate falls outside Iceland'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-iceland-soil-cation-exchange-capacity-0-5-cm-9f108ab3/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)