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

> HALOWERK Southern Land – Portugal 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 2026-09-15).

Returns the mean SoilGrids silt fraction for the 0–5 cm topsoil layer at a given WGS84 coordinate within Portugal, validated against Natural Earth boundaries.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/pt-soil-silt
- 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-portugal-soil-silt-fraction-0-5-cm-99e12270
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qnBbKj6c5mB_uKR1YASs_

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-portugal-soil-silt-fraction-0-5-cm-99e12270 -d '<json body>'
```

Example prompt: What's the mean silt fraction in the top 5 cm of soil at latitude 38.72, longitude -9.14 in Portugal?

## When to prefer this

Use this endpoint when you specifically need the silt fraction component of soil texture for a location within Portugal and want data sourced from the globally consistent SoilGrids dataset at the 0–5 cm depth. Prefer it over generic soil APIs when boundary validation against Portugal's Natural Earth polygon is required, or when you need a low-cost per-call lookup without managing raw raster data.

## Known failure modes

- Coordinate outside Portugal boundary: request rejected before payment is processed
- Latitude or longitude out of the published European coverage range (lat 34–72.5, lon -31.5–40.5): validation error
- Invalid or missing coordinate fields: schema validation error
- Service unavailable or upstream SoilGrids data not accessible: 5xx error

## How this service works

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

## Output

A numeric value representing the mean SoilGrids silt fraction (as a proportion or percentage) for the 0–5 cm topsoil layer at the specified coordinate. Returns an error or rejection if the coordinate falls outside the validated Natural Earth boundary for Portugal.

## 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-portugal-soil-silt-fraction-0-5-cm-99e12270/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)