# HALOWERK Atlantic Land – France Soil Nitrogen (0-5 cm)

> HALOWERK Atlantic Land – France Soil Nitrogen (0-5 cm) is a paid API for AI agents from atlantikland.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).

Returns mean SoilGrids total nitrogen concentration for the 0–5 cm soil layer at a given coordinate validated within France's boundary.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/fr-soil-nitrogen
- 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-atlantic-land-france-soil-nitrogen-0-5-cm-0bf660a7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5N2TA4heMiXu99cwHoZf-

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-atlantic-land-france-soil-nitrogen-0-5-cm-0bf660a7 -d '<json body>'
```

Example prompt: What's the mean total nitrogen in the top 5 cm of soil at latitude 48.85 and longitude 2.35 in France?

## When to prefer this

Use this endpoint when you need a fast, pay-per-call lookup of topsoil total nitrogen for a specific point coordinate inside France, backed by SoilGrids data. Prefer it over bulk datasets when you need individual-point queries with geographic boundary enforcement and no subscription overhead. It pairs well with sibling endpoints (organic carbon, CEC, slope, land cover) on the same platform for comprehensive land assessment.

## Known failure modes

- Coordinate outside France boundary – request rejected before payment, likely 422 or 400 error
- Latitude or longitude out of published European coverage range (lat 34–72.5, lon -31.5–40.5) – validation failure
- Invalid input types or missing required fields – schema validation error
- SoilGrids data unavailable for sparse or coastal grid cells – may return null or error
- Payment failure via x402 protocol – request not processed

## How this service works

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

## Output

A numeric value representing the mean total nitrogen concentration in the 0–5 cm topsoil layer (sourced from SoilGrids) for the queried coordinate. The coordinate is validated against France's Natural Earth boundary; requests falling outside France 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-atlantic-land-france-soil-nitrogen-0-5-cm-0bf660a7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from atlantikland.halowerk.com](https://www.zero.xyz/host/atlantikland.halowerk.com/llms.txt)