# HALOWERK Southern Land – Spain Soil Silt Fraction (0-5 cm)

> HALOWERK Southern Land – Spain Soil Silt 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 2026-09-14).

Returns the mean SoilGrids silt fraction for the 0–5 cm topsoil layer at a given coordinate within Spain, validated against Natural Earth boundaries.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/es-soil-silt
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-southern-land-spain-soil-silt-fraction-0-5-cm-244caa41
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_x61yJ4TkYTE8TAuqO1qRw

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-spain-soil-silt-fraction-0-5-cm-244caa41 -d '<json body>'
```

Example prompt: What's the silt fraction in the top 5 cm of soil at latitude 40.4168, longitude -3.7038 in Spain? I need the SoilGrids measurement for that spot.

## When to prefer this

Choose this endpoint when you need point-level SoilGrids silt fraction data specifically within Spain and want built-in boundary validation to avoid wasted calls. It is ideal for agricultural assessments, environmental research, or land suitability analysis where topsoil texture (silt component) at the 0–5 cm depth is the key variable. Pair with sibling endpoints on the same host for sand, clay, pH, nitrogen, and CEC to build a full soil profile.

## Known failure modes

- Coordinate outside Spain boundary — request rejected before payment with a boundary validation error
- Latitude or longitude out of the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Invalid or missing coordinate values — input validation failure
- Network or service unavailability — HTTP 5xx error
- Payment failure — x402 payment not completed, request not fulfilled

## How this service works

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

## Output

A numeric value representing the mean silt fraction (likely as a proportion or percentage) in the 0–5 cm topsoil layer at the queried coordinate, derived from SoilGrids data. Coordinates outside the Spain 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-spain-soil-silt-fraction-0-5-cm-244caa41/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)