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

> HALOWERK Baltic Land – Estonia 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 value for the 0–5 cm soil layer at a given coordinate within Estonia.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/ee-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-estonia-soil-organic-carbon-0-5-cm-b8315045
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LYR_qLUQb1NkinitNzSIR

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-organic-carbon-0-5-cm-b8315045 -d '<json body>'
```

Example prompt: What's the mean soil organic carbon in the 0–5 cm layer at latitude 58.3780, longitude 26.7290 in Estonia?

## When to prefer this

Choose this endpoint when you need point-level soil organic carbon data specifically for locations within Estonia and want authoritative SoilGrids values with built-in boundary validation. It is preferable over generic global soil APIs when you need Estonia-specific data with boundary enforcement at minimal cost per call. Avoid if the coordinate may be outside Estonia — sibling endpoints cover other Baltic or European sub-regions.

## Known failure modes

- Coordinate outside Estonia boundary — rejected with a validation error before payment
- Latitude or longitude outside the European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Point inside European range but outside Estonia polygon — boundary rejection
- Malformed or missing coordinate fields — request error
- Service unavailability or upstream SoilGrids data gap — server error

## How this service works

Mean SoilGrids organic carbon 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

Returns the mean SoilGrids organic carbon value (in g/kg or dg/kg) for the 0–5 cm soil depth at the queried coordinate, validated to fall within Estonia's boundary via Natural Earth polygons. Coordinates outside Estonia are rejected before the payment is processed.

## 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-organic-carbon-0-5-cm-b8315045/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)