# HALOWERK Nordic Land – Sweden Soil Organic Carbon (0-5 cm)

> HALOWERK Nordic Land – Sweden 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 content for the 0-5 cm topsoil layer at a given coordinate within Sweden, validated against Natural Earth boundaries.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/se-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-sweden-soil-organic-carbon-0-5-cm-e6b1f993
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sxRPrWL3ahaPg1AK4uk9-

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-sweden-soil-organic-carbon-0-5-cm-e6b1f993 -d '<json body>'
```

Example prompt: What's the mean soil organic carbon in the 0-5 cm topsoil layer at latitude 59.85, longitude 17.63 in Sweden?

## When to prefer this

Choose this endpoint when you need a point-level, authoritative SoilGrids organic carbon reading specifically for a location in Sweden and want boundary validation to prevent out-of-region charges. It is preferable over raw SoilGrids API access when you need pay-per-call micro-pricing and built-in coordinate validation, and over generic soil APIs when you require the specific 0-5 cm topsoil layer in the Nordic context.

## Known failure modes

- Coordinate outside Sweden's Natural Earth boundary — request rejected with validation error before payment
- Latitude or longitude outside European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Missing latitude or longitude parameter — request rejected with 400-level error
- SoilGrids data unavailable for remote or coastal fringe coordinates — may return null or empty value
- Network timeout or upstream SoilGrids data fetch failure

## How this service works

Mean SoilGrids organic carbon for the 0-5 cm layer. The coordinate is validated against the Natural Earth boundary for Sweden; results outside it are rejected before payment.

## Output

A numeric value representing the mean organic carbon content (g/kg or dg/kg, as per SoilGrids convention) for the 0-5 cm topsoil layer at the submitted coordinate. Coordinates outside Sweden's Natural Earth boundary are rejected before any charge is applied.

## 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-sweden-soil-organic-carbon-0-5-cm-e6b1f993/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)