# HALOWERK Baltic Land – Poland Soil pH (0-5 cm)

> HALOWERK Baltic Land – Poland Soil pH (0-5 cm) is a paid API for AI agents from baltikum.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 to fall within Poland.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/pl-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-baltic-land-poland-soil-ph-0-5-cm-67c61776
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OUkgcuSZznJnXr7VarvHk

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-baltic-land-poland-soil-ph-0-5-cm-67c61776 -d '<json body>'
```

Example prompt: What's the soil pH in the top 5 cm at latitude 52.23, longitude 21.01 in Poland? I need it from SoilGrids.

## When to prefer this

Choose this endpoint when you need point-level topsoil pH data specifically for locations within Poland, backed by SoilGrids (ISRIC) methodology, and you want pre-payment coordinate validation to avoid wasted spend on out-of-bounds queries. It is ideal for precision agriculture, environmental assessment, or land use planning workflows that require per-call, pay-as-you-go access without a subscription.

## Known failure modes

- Coordinate outside Poland's Natural Earth boundary — request rejected before payment, error indicating invalid location
- Latitude or longitude out of the accepted European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Missing or malformed latitude/longitude fields — schema validation error
- Network or upstream SoilGrids data unavailability — service error response

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

## Output

A numeric mean soil pH value (H2O scale) representing the acidity/alkalinity of the 0-5 cm topsoil layer at the queried coordinate, derived from SoilGrids data. Coordinates outside Poland's Natural Earth boundary are rejected before the payment is processed.

## 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-baltic-land-poland-soil-ph-0-5-cm-67c61776/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from baltikum.halowerk.com](https://www.zero.xyz/host/baltikum.halowerk.com/llms.txt)