# HALOWERK Nordic Land – Iceland Soil Bulk Density (0–5 cm)

> HALOWERK Nordic Land – Iceland Soil Bulk Density (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 bulk density for the 0–5 cm soil layer at a given WGS84 coordinate within Iceland, validated against the Natural Earth boundary.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/is-soil-bulk-density
- 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-bulk-density-0-5-cm-b6999d54
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_waLzeGbVhGscmKTsVtDKt

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-bulk-density-0-5-cm-b6999d54 -d '<json body>'
```

Example prompt: What's the mean soil bulk density for the top 5 cm of soil at latitude 64.13, longitude -21.89 in Iceland?

## When to prefer this

Choose this endpoint when you need point-level soil bulk density for a specific location within Iceland sourced from the authoritative SoilGrids dataset, especially when boundary validation against Iceland's Natural Earth polygon is required. Prefer it over general SoilGrids API wrappers when you need micro-payment per-query access (x402) without managing a SoilGrids API key, and over sibling HALOWERK endpoints when bulk density specifically (not pH, clay fraction, sand fraction, or texture class) is the target variable.

## Known failure modes

- Coordinate outside Iceland boundary — request rejected before payment is charged
- Latitude or longitude out of the published European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed or missing coordinate fields — schema validation error
- SoilGrids data unavailable for remote or coastal fringe locations — no-data response
- Payment failure via x402 protocol — request not processed

## How this service works

Mean SoilGrids bulk density 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 value representing the mean bulk density (typically in kg/dm³ or cg/cm³) of the 0–5 cm soil layer at the requested coordinate, derived from SoilGrids data, along with confirmation that the coordinate falls within the Iceland 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-bulk-density-0-5-cm-b6999d54/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)