# HALOWERK Southern Land – Greece Soil Clay Fraction (0-5 cm)

> HALOWERK Southern Land – Greece Soil Clay Fraction (0-5 cm) is a paid API for AI agents from suedland.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 Greece, validated against Natural Earth boundaries.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/gr-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-southern-land-greece-soil-clay-fraction-0-5-cm-8ff21429
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_haQe8QEVGU9bQbSuRFhpC

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-southern-land-greece-soil-clay-fraction-0-5-cm-8ff21429 -d '<json body>'
```

Example prompt: What's the mean clay fraction in the top 5 cm of soil at latitude 37.98, longitude 23.73 in Greece?

## When to prefer this

Choose this endpoint when you need point-level topsoil clay fraction data specifically for locations within Greece, backed by SoilGrids and validated against official boundaries. Prefer it over generic soil APIs when you need Greece-specific boundary enforcement, pay-per-call pricing without subscription overhead, and integration with sibling endpoints on the same platform (sand fraction, USDA texture class, CEC, etc.) for a complete soil profile.

## Known failure modes

- Coordinate outside Greece boundary — rejected before payment with a validation error
- Latitude or longitude out of the published European coverage range (lat 34-72.5, lon -31.5-40.5) — schema validation error
- Network or upstream SoilGrids data unavailability — service error response
- Malformed request body — HTTP 400 bad request

## How this service works

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

## Output

A numeric value representing the mean clay fraction (as a proportion or percentage) for the 0-5 cm soil depth at the queried coordinate, derived from SoilGrids data. Coordinates outside Greece's Natural Earth boundary 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-southern-land-greece-soil-clay-fraction-0-5-cm-8ff21429/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suedland.halowerk.com](https://www.zero.xyz/host/suedland.halowerk.com/llms.txt)