# HALOWERK Baltic Land – Estonia Soil Cation Exchange Capacity (0-5 cm)

> HALOWERK Baltic Land – Estonia Soil Cation Exchange Capacity (0-5 cm) is a paid API for AI agents from baltikum.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 topsoil layer at a given coordinate within Estonia.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/ee-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-baltic-land-estonia-soil-cation-exchange-capacity-0-5-cm-e81dfdec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dOOTQMtBLi642xG9Vorjb

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-baltic-land-estonia-soil-cation-exchange-capacity-0-5-cm-e81dfdec -d '<json body>'
```

Example prompt: What's the SoilGrids cation exchange capacity for the 0-5 cm topsoil layer at latitude 58.3780, longitude 26.7290 in Estonia?

## When to prefer this

Choose this endpoint when you specifically need SoilGrids-derived topsoil CEC data for a point known to be within Estonia, and you want boundary validation enforced server-side before payment. It is preferable over general SoilGrids APIs when you need a pay-per-call microservice with built-in Estonian geographic validation and no API key management.

## Known failure modes

- Coordinate outside Estonia boundary: request rejected before payment with a boundary-validation error
- Coordinate within Europe but outside Estonian polygon: rejected despite being within the input schema's broader European bounding box
- Latitude or longitude outside the declared European range (34–72.5°N, -31.5–40.5°E): schema validation error
- Network or upstream SoilGrids data unavailability: service error response
- Malformed JSON body or missing required fields: 400-level error

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

## Output

A numeric value representing the mean cation exchange capacity (CEC) of the 0-5 cm topsoil layer derived from SoilGrids, expressed in cmolc/kg, for the requested Estonian coordinate. Coordinates outside Estonia's boundary are rejected before any charge is incurred.

## 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-baltic-land-estonia-soil-cation-exchange-capacity-0-5-cm-e81dfdec/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from baltikum.halowerk.com](https://www.zero.xyz/host/baltikum.halowerk.com/llms.txt)