# HALOWERK Southern Land – Greece Surface Soil Sand Fraction

> HALOWERK Southern Land – Greece Surface Soil Sand Fraction 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 sand fraction for the 0–5 cm topsoil layer at a given coordinate within Greece.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/gr-soil-sand
- 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-surface-soil-sand-fraction-d416e49a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xOvSPPtB8wtK5AbyQdNBS

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-surface-soil-sand-fraction-d416e49a -d '<json body>'
```

Example prompt: What is the mean sand fraction of the topsoil (0–5 cm) at latitude 37.97, longitude 23.73 in Greece?

## When to prefer this

Choose this endpoint when you need a point-level soil sand fraction value specifically for a location in Greece and want it delivered via a pay-per-call x402 micropayment model without requiring an API subscription. It is ideal for low-frequency, ad-hoc lookups in agentic workflows where only Greek coordinates are relevant. Prefer alternatives if you need bulk coverage, non-Greek European locations, or other soil depth layers beyond 0–5 cm.

## Known failure modes

- Coordinate outside Greece boundary — request rejected before payment is processed
- Latitude or longitude out of the declared European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Payment failure via x402 protocol — call not executed
- Network timeout or upstream SoilGrids data unavailability — service error
- Malformed request body missing required latitude/longitude fields — schema validation error

## How this service works

Mean SoilGrids sand 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 sand fraction (likely as g/kg or percentage) of the 0–5 cm topsoil layer at the requested coordinate, sourced from SoilGrids global soil data. Only coordinates that fall within the Greece boundary as defined by Natural Earth are accepted; out-of-bounds requests are rejected.

## 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-surface-soil-sand-fraction-d416e49a/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)