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

> HALOWERK Nordic Land – Iceland 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 depth layer at a given coordinate within Iceland, validated against its Natural Earth boundary.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/is-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-iceland-soil-organic-carbon-0-5-cm-6163e15e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Tdeu67Ot6L_6xZdmx_QQF

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-organic-carbon-0-5-cm-6163e15e -d '<json body>'
```

Example prompt: What's the mean soil organic carbon in the top 5 cm at latitude 64.13, longitude -21.93 in Iceland? Use the HALOWERK Nordic Land SoilGrids endpoint.

## When to prefer this

Use this endpoint when you need point-level SoilGrids organic carbon data specifically for Iceland. It is ideal for environmental assessments, land-use studies, agricultural soil analysis, or carbon accounting workflows focused on Icelandic locations. It enforces geographic validation so you can trust that results correspond to real Iceland coordinates. Prefer it over generic SoilGrids API wrappers when you need per-call micropayment billing via x402 and Iceland-specific boundary enforcement.

## Known failure modes

- Coordinate outside Iceland boundary — request rejected before payment with a boundary validation error
- Latitude or longitude out of the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Missing latitude or longitude in request body — 400 bad request
- Payment failure or insufficient USDC balance — 402 payment required
- Upstream SoilGrids data unavailable for the requested tile — service error

## How this service works

Mean SoilGrids organic carbon 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 SoilGrids organic carbon concentration in the 0–5 cm soil layer at the requested coordinate. The coordinate is first validated against the Natural Earth boundary for Iceland; requests outside Iceland are rejected before any payment is processed.

## 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-organic-carbon-0-5-cm-6163e15e/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)