# HALOWERK Baltic Land – Estonia SoilGrids Sand Fraction (0–5 cm)

> HALOWERK Baltic Land – Estonia SoilGrids Sand Fraction (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 sand fraction for the 0–5 cm soil layer at a given WGS84 coordinate validated to be within Estonia.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/ee-soil-sand
- 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-soilgrids-sand-fraction-0-5-cm-91ca79fd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ucsp_pqzIDTdV6lKBvLo_

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-soilgrids-sand-fraction-0-5-cm-91ca79fd -d '<json body>'
```

Example prompt: What's the mean sand fraction in the top 5 cm of soil at 58.3795° N, 26.7290° E in Estonia? I need the SoilGrids value for that coordinate.

## When to prefer this

Choose this endpoint when you need point-level SoilGrids sand fraction data specifically for a location within Estonia and want a lightweight, pay-per-call lookup with built-in boundary validation. Prefer it over generic soil APIs when Estonia-specific geographic validation and micro-payment (x402) billing are required, or when integrating with other HALOWERK Baltic Land endpoints for multi-variable soil and terrain analysis of the same site.

## Known failure modes

- Coordinate outside Estonia boundary — rejected before payment with a validation error
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Missing latitude or longitude in request body — 400 bad request
- Payment failure via x402 protocol — call not executed
- SoilGrids data unavailable for the queried cell — possible null or error response

## How this service works

Mean SoilGrids sand fraction 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 mean sand fraction value (likely as a percentage or volumetric fraction) for the 0–5 cm soil layer at the queried coordinate, derived from SoilGrids data. Coordinates outside the Estonian boundary are rejected with an error before any charge is made.

## 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-soilgrids-sand-fraction-0-5-cm-91ca79fd/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)