# HALOWERK Baltic Land – Estonia Soil Total Nitrogen (0–5 cm)

> HALOWERK Baltic Land – Estonia Soil Total Nitrogen (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 total nitrogen content for the 0–5 cm topsoil layer at a given coordinate within Estonia.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/ee-soil-nitrogen
- 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-total-nitrogen-0-5-cm-567009ef
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gLmZ609tHuogzNMAaaCEZ

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-total-nitrogen-0-5-cm-567009ef -d '<json body>'
```

Example prompt: What's the total nitrogen content in the top 5 cm of soil at latitude 58.37, longitude 26.73 in Estonia?

## When to prefer this

Use this endpoint when you need point-level SoilGrids total nitrogen data specifically within Estonia and want boundary pre-validation (so no charge for out-of-bounds queries). Prefer this over generic SoilGrids API access when you need a low-cost, pay-per-call micropayment model and Estonia is the geographic scope. Choose sibling endpoints on the same domain for other Estonian soil or land surface properties.

## Known failure modes

- Coordinate outside Estonia boundary — request rejected before payment is processed
- Latitude or longitude outside European coverage range — schema validation error
- Coordinates on water or non-land area — may return null or rejection
- Network timeout or provider unavailability — HTTP 5xx error
- Malformed request body — HTTP 4xx validation error

## How this service works

Mean SoilGrids total nitrogen 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 total nitrogen content (in g/kg or cg/kg, per SoilGrids convention) for the 0–5 cm soil layer at the queried coordinate. Returns an error or rejection if the coordinate falls outside Estonia's boundary.

## 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-total-nitrogen-0-5-cm-567009ef/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)