# HALOWERK Eastern Land – Bulgaria Soil Silt Fraction (0-5 cm)

> HALOWERK Eastern Land – Bulgaria Soil Silt Fraction (0-5 cm) is a paid API for AI agents from ostland.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 soil layer at a given coordinate within Bulgaria, validated against the Natural Earth boundary.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/bg-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-eastern-land-bulgaria-soil-silt-fraction-0-5-cm-b2695ffd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_apHCxB9HG52v4yuD4FTZM

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-eastern-land-bulgaria-soil-silt-fraction-0-5-cm-b2695ffd -d '<json body>'
```

Example prompt: What's the mean silt fraction in the topsoil (0-5 cm layer) at latitude 42.6977, longitude 23.3219 in Bulgaria?

## When to prefer this

Choose this endpoint when you need point-level topsoil silt fraction data specifically for locations within Bulgaria, backed by SoilGrids. Prefer it over generic soil APIs when you need Bulgaria-boundary-validated results with a simple pay-per-call model (x402) and no subscription required.

## Known failure modes

- Coordinate outside Bulgaria boundary — request rejected before payment with a validation error
- Latitude or longitude out of European coverage range (lat 34–72.5, lon −31.5–40.5) — schema validation failure
- Missing or malformed coordinate values — input validation error
- SoilGrids data unavailable for the specific grid cell — no data returned
- Network timeout or upstream SoilGrids unavailability

## How this service works

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

## Output

Returns the mean silt fraction (as a proportion or percentage) for the 0-5 cm topsoil layer at the queried coordinate, sourced from SoilGrids. Requests with coordinates outside the Natural Earth boundary of Bulgaria are rejected before any charge is applied.

## 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-eastern-land-bulgaria-soil-silt-fraction-0-5-cm-b2695ffd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ostland.halowerk.com](https://www.zero.xyz/host/ostland.halowerk.com/llms.txt)