# HALOWERK Nordic Land – Sweden Soil pH (0-5 cm)

> HALOWERK Nordic Land – Sweden Soil pH (0-5 cm) is a paid API for AI agents from nordland.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).

Returns the mean SoilGrids pH in H2O value for the 0-5 cm topsoil layer at a given WGS84 coordinate within Sweden.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/se-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-nordic-land-sweden-soil-ph-0-5-cm-2be2163f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a_xpVJJq5lLhYnl1L-ZSA

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-nordic-land-sweden-soil-ph-0-5-cm-2be2163f -d '<json body>'
```

Example prompt: What's the topsoil pH for the spot at latitude 59.33, longitude 18.07 in Sweden — pull the SoilGrids H2O pH for the 0-5 cm layer?

## When to prefer this

Choose this endpoint when you need a single, authoritative SoilGrids topsoil pH (H2O) value for a specific point in Sweden and want boundary validation ensuring coordinates are within the country. It is optimized for Swedish territory, costs $0.004 USDC per call, and pre-validates coordinates against Sweden's Natural Earth boundary before charging, making it preferable to generic global soil APIs when the use case is specifically Swedish land analysis.

## Known failure modes

- Coordinate outside Sweden boundary — request rejected before payment is processed
- Latitude or longitude out of the published European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Invalid or missing coordinate fields — schema validation failure
- Coordinate within European bounding box but outside Sweden polygon — boundary rejection

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

## Output

A numeric mean soil pH value (H2O method) for the 0-5 cm topsoil layer at the queried coordinate, derived from SoilGrids global soil property maps and validated to fall within Sweden's Natural Earth 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-nordic-land-sweden-soil-ph-0-5-cm-2be2163f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nordland.halowerk.com](https://www.zero.xyz/host/nordland.halowerk.com/llms.txt)