# HALOWERK Atlantic Land — France Soil CEC (0–5 cm)

> HALOWERK Atlantic Land — France Soil CEC (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 the mean SoilGrids cation exchange capacity (CEC) for the 0–5 cm soil layer at a given coordinate within France.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/fr-soil-cec
- 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-cec-0-5-cm-6139fe05
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PNZhHpdPxG3qzAco3zt7V

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-cec-0-5-cm-6139fe05 -d '<json body>'
```

Example prompt: What's the cation exchange capacity of the topsoil (0–5 cm) at latitude 47.35, longitude 2.10 in France? I need the SoilGrids CEC value for that plot.

## When to prefer this

Choose this endpoint when you need authoritative SoilGrids CEC data specifically for locations within France, especially for agricultural assessment, land valuation, or soil fertility analysis. It is more suitable than a generic soil API when you need pay-per-query pricing without subscription overhead and need the boundary validation guarantee that ensures you are querying within France.

## Known failure modes

- Coordinate outside France boundary — request rejected before payment with a boundary validation error
- Latitude or longitude out of the declared European coverage range (34–72.5°N, -31.5–40.5°E) — schema validation failure
- No SoilGrids data available for the requested location — null or missing value response
- Malformed request body — missing or invalid latitude/longitude fields
- Payment failure or x402 protocol error — request not processed

## How this service works

Mean SoilGrids cation exchange capacity 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 mean cation exchange capacity value (in cmol+/kg or equivalent SoilGrids units) for the 0–5 cm soil layer at the queried coordinate, derived from the SoilGrids dataset. Coordinates outside France'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-atlantic-land-france-soil-cec-0-5-cm-6139fe05/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)