# HALOWERK Southern Land – Spain Soil pH (0–5 cm)

> HALOWERK Southern Land – Spain Soil pH (0–5 cm) is a paid API for AI agents from suedland.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 coordinate within Spain, validated against the Natural Earth Spain boundary.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/es-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-southern-land-spain-soil-ph-0-5-cm-c941e323
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SZQycDTf4ikK73S3kGOP_

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-southern-land-spain-soil-ph-0-5-cm-c941e323 -d '<json body>'
```

Example prompt: What's the SoilGrids topsoil pH (0–5 cm) at latitude 37.89, longitude -4.78 in Spain? I need to know if the soil is acidic or alkaline for a planting decision.

## When to prefer this

Choose this endpoint when you need authoritative SoilGrids topsoil pH data for a specific point location within Spain, especially for agricultural suitability assessments, precision farming, or environmental analysis where soil acidity in the 0–5 cm layer is the key variable. It is purpose-built for Spain with boundary validation ensuring results are always geographically meaningful.

## Known failure modes

- Coordinate outside Spain boundary: rejected before payment, returns error indicating the point is outside valid coverage
- Latitude or longitude out of European bounds (34–72.5°N, -31.5–40.5°E): schema validation error
- Missing required latitude or longitude: 400-level validation error
- SoilGrids data unavailable for remote or coastal edge coordinates: may return null or no-data 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 Spain; results outside it are rejected before payment.

## Output

A numeric mean soil pH value (in H2O scale) for the 0–5 cm depth layer at the specified coordinate, derived from SoilGrids data, returned only for coordinates that fall within the Spain boundary.

## 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-southern-land-spain-soil-ph-0-5-cm-c941e323/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suedland.halowerk.com](https://www.zero.xyz/host/suedland.halowerk.com/llms.txt)