# HALOWERK Europe Land – Soil pH Buffer 250m

> HALOWERK Europe Land – Soil pH Buffer 250m is a paid API for AI agents from euroland.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Returns the mean SoilGrids pH in H2O for the 0–5 cm soil layer, evaluated within a 250-metre circular neighbourhood around a given European coordinate.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-soil-ph-buffer-250m
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-europe-land-soil-ph-buffer-250m-e0f25748
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bZeoBz5hk1iR07FbV9AgM

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-europe-land-soil-ph-buffer-250m-e0f25748 -d '<json body>'
```

Example prompt: What's the surface soil pH (0–5 cm) at latitude 48.85 and longitude 2.35 in Europe — give me the mean value within a 250-metre radius?

## When to prefer this

Choose this endpoint when you need a point-based, spatially smoothed (250m buffer) soil pH reading for any location within the 30-country European coverage area, especially for agricultural, environmental, or land-use analysis workflows. Prefer it over polygon-based variants when you have only a coordinate and not a polygon boundary. Use it for rapid enrichment of location records with standardized SoilGrids data without requiring GIS infrastructure.

## Known failure modes

- Coordinate outside European coverage bounds (latitude 34–72.5, longitude -31.5–40.5) returns an error
- Missing or malformed latitude/longitude fields cause a validation error
- Coordinates in uncovered territories or ocean areas may return null or no-data values
- Network or payment (x402) failures prevent response delivery

## How this service works

Mean SoilGrids pH in H2O for the 0-5 cm layer. The service evaluates a circular 250 metre neighborhood around one coordinate and returns standardized units across all 30 covered countries.

## Output

A standardized mean soil pH (H2O method) value for the 0–5 cm depth layer, derived from SoilGrids data and spatially aggregated within a 250-metre circular buffer around the supplied coordinate. The value is consistent and comparable across all 30 covered European countries.

## 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-europe-land-soil-ph-buffer-250m-e0f25748/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from euroland.halowerk.com](https://www.zero.xyz/host/euroland.halowerk.com/llms.txt)