# HALOWERK Southern Land — Spain Soil Cation Exchange Capacity (0-5 cm)

> HALOWERK Southern Land — Spain Soil Cation Exchange Capacity (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 cation exchange capacity (CEC) for the 0–5 cm soil layer at a given coordinate within Spain.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/es-soil-cec
- 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-cation-exchange-capacity-0-5-cm-686023f2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IJlps6MtsyHHDGgBPMyQT

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-cation-exchange-capacity-0-5-cm-686023f2 -d '<json body>'
```

Example prompt: What's the cation exchange capacity of the topsoil at 40.4168° N, 3.7038° W in Spain? I need the SoilGrids CEC for the 0–5 cm layer at that point.

## When to prefer this

Use this endpoint when you need a reliable, pay-per-call lookup of soil CEC specifically within Spain, backed by SoilGrids data. It is ideal for agents doing per-parcel soil quality assessments, agricultural planning tools, or land enrichment pipelines that require the 0–5 cm surface layer CEC without needing to integrate directly with the SoilGrids API. Prefer this over generic geospatial APIs when Spain-scoped soil chemistry data is the specific requirement.

## Known failure modes

- Coordinate outside Spain's Natural Earth boundary — request is rejected before payment with a geographic validation error
- Latitude or longitude outside the accepted European range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Missing or malformed coordinate parameters — returns a 400-level error
- SoilGrids data unavailable for the specific coordinate (e.g. coastal/maritime edge cases) — may return null or error response

## How this service works

Mean SoilGrids cation exchange capacity 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 value representing the mean cation exchange capacity (CEC) of the 0–5 cm soil layer at the queried coordinate, derived from SoilGrids data. The coordinate must fall within Spain's Natural Earth boundary; requests outside this 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-southern-land-spain-soil-cation-exchange-capacity-0-5-cm-686023f2/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)