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

> HALOWERK Eastern Land – Hungary 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 topsoil layer at a given WGS84 coordinate validated against Hungary's boundary.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/hu-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-hungary-soil-ph-0-5-cm-b4e0d211
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pCKxuyJjviiks3qKn4kwI

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-hungary-soil-ph-0-5-cm-b4e0d211 -d '<json body>'
```

Example prompt: What's the soil pH in the top 5 cm at latitude 47.49 and longitude 19.04 in Hungary? I need it for a farming suitability check.

## When to prefer this

Choose this endpoint when you specifically need SoilGrids-derived topsoil pH (H2O, 0–5 cm) for a point location inside Hungary and want boundary validation enforced server-side before incurring a charge. Prefer it over generic SoilGrids API access when you need a pre-validated, micro-payment-friendly single-point lookup with Hungarian geographic scope built in.

## Known failure modes

- Coordinate outside Hungary boundary — request rejected before payment with a validation error
- Latitude or longitude outside the declared European coverage range (34–72.5°N, 31.5°W–40.5°E) — schema validation failure
- Network or upstream SoilGrids data unavailability — service error response
- Malformed request body — missing or non-numeric coordinate fields cause a 400-level error

## 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 Hungary; results outside it are rejected before payment.

## Output

A numeric mean soil pH value (pH in H2O scale) representing the 0–5 cm topsoil layer at the requested coordinate, derived from SoilGrids global predictions. Coordinates outside Hungary's Natural Earth boundary 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-hungary-soil-ph-0-5-cm-b4e0d211/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)