# HALOWERK Eastern Land – Croatia Soil pH (0-5 cm)

> HALOWERK Eastern Land – Croatia Soil pH (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 pH in H2O for the 0-5 cm soil layer at a given WGS84 coordinate within Croatia, with boundary validation.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/hr-soil-ph
- 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-croatia-soil-ph-0-5-cm-82c7f6b8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a7_gE3is_gJQ4LMX84Elt

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-croatia-soil-ph-0-5-cm-82c7f6b8 -d '<json body>'
```

Example prompt: What's the mean soil pH in water for the top 5 centimeters of soil at latitude 45.813, longitude 15.977 in Croatia?

## When to prefer this

Choose this endpoint when you specifically need topsoil (0-5 cm) pH in H2O for a location within Croatia, and want built-in boundary validation so out-of-country coordinates are rejected at no cost. It is well-suited for agricultural planning, land suitability assessments, or environmental baseline studies scoped to Croatian territory. If you need pH for other countries or deeper soil layers, look for sibling endpoints covering those regions or depths.

## Known failure modes

- Coordinate outside Croatia boundary — rejected before payment with a validation error
- Coordinate within European coverage bounds but outside Croatia — boundary check fails
- Invalid latitude/longitude values outside the European coverage range — schema validation error
- Network timeout or upstream SoilGrids data unavailability

## How this service works

Mean SoilGrids pH in H2O for the 0-5 cm layer. The coordinate is validated against the Natural Earth boundary for Croatia; results outside it are rejected before payment.

## Output

Returns the mean SoilGrids pH measured in H2O for the 0–5 cm soil depth layer at the queried coordinate. If the coordinate falls outside the validated Croatia boundary, the request is 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-croatia-soil-ph-0-5-cm-82c7f6b8/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)