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

> HALOWERK Nordic Land – Iceland 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 for the 0–5 cm soil layer at a given WGS84 coordinate within Iceland, rejecting points outside the island boundary.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/is-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-iceland-soil-ph-0-5-cm-f08dfe56
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3YIat56jb46a6j3mE2FsJ

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-iceland-soil-ph-0-5-cm-f08dfe56 -d '<json body>'
```

Example prompt: What is the mean soil pH in the top 5 cm at latitude 65.2, longitude -19.1 in Iceland? I need the SoilGrids H2O pH value for that spot.

## When to prefer this

Choose this endpoint when you need topsoil pH (H2O, 0–5 cm) specifically for a coordinate in Iceland, backed by SoilGrids data with built-in boundary validation. It is purpose-built for Iceland and will reject out-of-bounds coordinates before charging, making it safe for automated pipelines. Use it over generic SoilGrids API calls when you want pre-validated, pay-per-call access without managing a SoilGrids subscription.

## Known failure modes

- Coordinate outside Iceland boundary – request rejected, no charge applied
- Latitude or longitude out of the declared European coverage range (34–72.5°N, -31.5–40.5°E) – validation error
- SoilGrids data unavailable for the requested cell – null or error response
- Malformed or missing lat/lon fields – schema validation error
- Payment failure via x402 protocol – request not processed

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

## Output

Returns the mean SoilGrids pH in H2O value for the 0–5 cm topsoil layer at the requested coordinate. Coordinates outside the Iceland 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-nordic-land-iceland-soil-ph-0-5-cm-f08dfe56/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)