# HALOWERK Nordic Land — Denmark Soil Organic Carbon (0–5 cm)

> HALOWERK Nordic Land — Denmark Soil Organic Carbon (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 organic carbon concentration for the 0–5 cm soil layer at a given WGS84 coordinate within Denmark.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/dk-soil-organic-carbon
- 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-soil-organic-carbon-0-5-cm-21b5bd14
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_k4OOamjOJkjW6bqrJFY7K

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-organic-carbon-0-5-cm-21b5bd14 -d '<json body>'
```

Example prompt: What's the mean soil organic carbon in the top 5 cm of soil at latitude 56.15, longitude 10.21 in Denmark?

## When to prefer this

Choose this endpoint when you need point-level soil organic carbon estimates specifically within Denmark, where the built-in boundary validation ensures only valid Danish coordinates are charged. Prefer it over raw SoilGrids API access when you want a pay-per-call microservice with coordinate guard-rails and no SoilGrids account required.

## Known failure modes

- Coordinate outside Denmark boundary — rejected with a validation error, no charge
- Latitude or longitude outside European coverage bounds (34–72.5°N, -31.5–40.5°E) — schema validation failure
- Malformed input (non-numeric coordinates) — input validation error
- Network or upstream SoilGrids data unavailability — service error response
- Payment failure via x402 — request not processed

## How this service works

Mean SoilGrids organic carbon 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

Returns the mean organic carbon concentration (likely in g/kg or dg/kg as per SoilGrids conventions) for the 0–5 cm topsoil layer at the queried WGS84 point, derived from SoilGrids interpolated data. Coordinates outside the Denmark boundary are rejected before any charge is incurred.

## 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-organic-carbon-0-5-cm-21b5bd14/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)