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

> HALOWERK Atlantic Land – France Soil Clay Fraction (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 clay fraction for the 0-5 cm soil layer at a given coordinate within France, validated against Natural Earth boundaries.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/fr-soil-clay
- 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-clay-fraction-0-5-cm-08e144a9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ObqeRD4jw_9w4-7bppWND

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-clay-fraction-0-5-cm-08e144a9 -d '<json body>'
```

Example prompt: What is the SoilGrids mean clay fraction in the 0-5 cm soil layer at latitude 48.8566, longitude 2.3522 in France?

## When to prefer this

Choose this endpoint when you need precise, point-level SoilGrids clay fraction data specifically for locations within France. It includes built-in boundary validation so invalid coordinates are caught before billing. Prefer it over generic soil APIs when you require the SoilGrids dataset for the 0-5 cm layer and need cost-efficient per-call pricing with x402 micropayment support.

## Known failure modes

- Coordinate outside France boundary: request is rejected before payment, returning a boundary validation error
- Coordinate within the European bounding box but outside France: rejected by Natural Earth polygon check
- Missing or malformed latitude/longitude: schema validation error
- Latitude or longitude outside the European coverage range (34–72.5°N, -31.5–40.5°E): rejected by schema validation
- SoilGrids upstream data unavailable for the queried point: may return null or error response

## How this service works

Mean SoilGrids clay fraction 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 SoilGrids clay fraction (g/kg or %) for the 0-5 cm topsoil layer at the queried coordinate. The coordinate is first validated to fall within France's Natural Earth boundary; requests outside it are rejected before any payment is charged.

## 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-clay-fraction-0-5-cm-08e144a9/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)