# HALOWERK Baltic Land – Poland Soil Organic Carbon (0-5 cm)

> HALOWERK Baltic Land – Poland Soil Organic Carbon (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 organic carbon content for the 0-5 cm topsoil layer at a given WGS84 coordinate within Poland, validated against the Natural Earth boundary.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/pl-soil-organic-carbon
- 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-organic-carbon-0-5-cm-73bfe0e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xVIcSJX1wzEil86ub2dpz

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-organic-carbon-0-5-cm-73bfe0e4 -d '<json body>'
```

Example prompt: What is the mean soil organic carbon content in the 0-5 cm layer at latitude 52.2297, longitude 21.0122 in Poland?

## When to prefer this

Use this endpoint when you need a standardised, SoilGrids-derived topsoil organic carbon value specifically for a point within Poland. It is ideal for precision agriculture workflows, environmental baseline assessments, carbon sequestration screening, and land analytics pipelines that require pay-per-call access without a bulk data subscription. Prefer sibling endpoints on the same platform for related soil properties (sand fraction, clay, bulk density) at the same location.

## Known failure modes

- Coordinate outside Poland boundary: request rejected before payment, error indicating point is outside coverage area
- Latitude or longitude outside the accepted European bounding box: validation error
- Missing required latitude or longitude parameter: schema validation error
- Coordinate on the boundary edge with ambiguous country assignment may be rejected

## How this service works

Mean SoilGrids organic carbon 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

A numeric value representing the mean SoilGrids organic carbon content (likely in g/kg or dg/kg) for the 0-5 cm topsoil layer at the queried coordinate. Coordinates outside the Natural Earth boundary for Poland 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-organic-carbon-0-5-cm-73bfe0e4/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)