# HALOWERK Eastern Land Bulgaria Soil Bulk Density

> HALOWERK Eastern Land Bulgaria Soil Bulk Density 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 bulk density for the 0-5 cm topsoil layer at a given coordinate validated against the Bulgaria boundary

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/bg-soil-bulk-density
- 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-bulk-density-c30f2cca
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TQa6Fv7N_eneM0kXjH-84

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-bulk-density-c30f2cca -d '<json body>'
```

Example prompt: What's the mean topsoil bulk density for the 0-5 cm layer at latitude 42.6, longitude 23.3 in Bulgaria?

## When to prefer this

Use this endpoint when you need SoilGrids-derived mean soil bulk density specifically for the 0-5 cm topsoil layer at a point location within Bulgaria, especially when geographic validation against the Bulgarian national boundary is required before incurring any cost. Prefer this over generic soil APIs when you need pay-per-call pricing with boundary enforcement and SoilGrids provenance.

## Known failure modes

- Coordinate outside Bulgaria 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)
- Missing or malformed latitude/longitude fields in request body
- SoilGrids data unavailable for the specified location (nodata pixels)
- Network or upstream SoilGrids service error

## How this service works

Mean SoilGrids bulk density 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

A numeric mean bulk density value (in g/cm³ or kg/m³ per SoilGrids convention) representing the average soil bulk density for the 0-5 cm layer at the validated Bulgarian coordinate, derived from SoilGrids data.

## 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-bulk-density-c30f2cca/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)