# HALOWERK Nordic Land — Denmark Surface Clay Fraction (SoilGrids 0–5 cm)

> HALOWERK Nordic Land — Denmark Surface Clay Fraction (SoilGrids 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 clay fraction (%) at 0–5 cm depth from SoilGrids for a WGS84 coordinate validated within Denmark's boundary.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/dk-soil-clay
- 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-denmark-surface-clay-fraction-soilgrids-0-5-cm-18999220
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_32xGZRgTAGFLIKeLXfxnF

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-surface-clay-fraction-soilgrids-0-5-cm-18999220 -d '<json body>'
```

Example prompt: What is the mean clay fraction in the top 5 cm of soil at latitude 55.6761 and longitude 12.5683 in Denmark?

## When to prefer this

Choose this endpoint when you need authoritative SoilGrids-derived surface clay fraction specifically for a point within Denmark, especially when the geographic constraint (Denmark only) is acceptable and you want a low-cost per-call micro-payment model. Prefer it over generic soil APIs when you need the SoilGrids 0–5 cm clay mean with built-in boundary validation.

## Known failure modes

- Coordinate outside Denmark boundary — rejected before payment is processed
- Latitude or longitude outside the European coverage bounds (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed or missing coordinate fields — schema validation error
- SoilGrids data unavailable for the queried cell — no data response

## How this service works

Mean SoilGrids clay fraction 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 clay fraction value (percentage or volumetric proportion) for the 0–5 cm soil layer at the queried coordinate, derived from SoilGrids global soil data, confirmed to fall 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-surface-clay-fraction-soilgrids-0-5-cm-18999220/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)