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

> HALOWERK Nordic Land – Norway 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 WGS84 coordinate validated within Norway's boundary.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/no-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-norway-soil-cation-exchange-capacity-0-5-cm-b3acde43
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IVsZV4HsTr3kb5m8NAGGj

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-norway-soil-cation-exchange-capacity-0-5-cm-b3acde43 -d '<json body>'
```

Example prompt: What is the SoilGrids cation exchange capacity for the top 5 cm of soil at latitude 59.91 and longitude 10.75 in Norway?

## When to prefer this

Use this endpoint when you need SoilGrids-sourced surface-layer (0-5 cm) CEC values specifically for locations within Norway, and want pre-validated boundary checking (non-Norwegian coordinates are rejected without charge). Prefer it over generic SoilGrids APIs when operating within a Norway-scoped workflow and when per-call micropayment pricing via x402 is acceptable. It is one of a family of sibling endpoints on the same host covering other soil properties (pH, organic carbon, sand, clay, texture class, etc.) for the same region.

## Known failure modes

- Coordinate outside Norway boundary – request rejected before payment with a boundary validation error
- Coordinate within European coverage range but outside Norway polygon – rejected
- Invalid latitude/longitude values (outside -31.5–40.5 lon or 34–72.5 lat) – schema validation error
- Network timeout or upstream SoilGrids unavailability – service error response
- Payment failure (x402) – call not processed

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

## Output

A numeric mean cation exchange capacity (CEC) value in cmolc/kg for the 0-5 cm soil layer at the requested Norwegian coordinate, sourced from SoilGrids. The coordinate is first validated against Norway's Natural Earth boundary; requests outside Norway are rejected before any charge is made.

## 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-norway-soil-cation-exchange-capacity-0-5-cm-b3acde43/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)