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

> HALOWERK Baltic Land – Poland 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, validated to lie within Poland's boundary.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/pl-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-poland-soil-cation-exchange-capacity-0-5-cm-13f1affe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jqN7ADh9B3f94740BFavi

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-poland-soil-cation-exchange-capacity-0-5-cm-13f1affe -d '<json body>'
```

Example prompt: What's the SoilGrids cation exchange capacity for the topsoil (0-5 cm layer) at latitude 52.23 and longitude 21.01 in Poland?

## When to prefer this

Choose this endpoint when you need point-level SoilGrids CEC data specifically for locations within Poland, benefit from built-in boundary validation (so out-of-Poland queries are caught before payment), and want a low-cost ($0.004 USDC) pay-per-call model without managing SoilGrids API credentials directly. Prefer it over generic SoilGrids access when operating in an agentic x402 payment workflow targeting Polish geography.

## Known failure modes

- Coordinate outside Poland boundary: request rejected before payment, returns boundary validation error
- Coordinate outside the broader European coverage range (lat 34–72.5, lon -31.5–40.5): schema validation error
- Missing or malformed latitude/longitude inputs: request rejected with parameter error
- SoilGrids data unavailable for the given location (e.g. water body or urban void): may return null or no-data response
- Network or upstream SoilGrids service downtime: timeout or 503 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 Poland; results outside it are rejected before payment.

## Output

Returns the mean cation exchange capacity (CEC) value from SoilGrids for the 0-5 cm topsoil layer at the requested coordinate. Coordinates outside Poland's 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-baltic-land-poland-soil-cation-exchange-capacity-0-5-cm-13f1affe/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)