# HALOWERK Baltic Land – Estonia Built-Up Share

> HALOWERK Baltic Land – Estonia Built-Up Share is a paid API for AI agents from baltikum.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the share of ESA WorldCover 2021 pixels classified as built-up at a given coordinate within Estonia.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/ee-built-up-share
- Price: $0.003/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-built-up-share-613188d7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aGsXp3B6q45ZHTdYaqv9M

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-built-up-share-613188d7 -d '<json body>'
```

Example prompt: What share of ESA WorldCover 2021 pixels around latitude 59.4370, longitude 24.7536 in Estonia are classified as built-up?

## When to prefer this

Choose this endpoint when you need a precise, per-point built-up land cover fraction derived from ESA WorldCover 2021 satellite data specifically for coordinates within Estonia. It is ideal for geospatial enrichment pipelines, site suitability analyses, urban density assessments, or any workflow requiring authoritative remote-sensing-based urbanization metrics at a point location in Estonia.

## Known failure modes

- Coordinate outside Estonia boundary — rejected before payment with a validation error
- Latitude or longitude out of the accepted European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Invalid or malformed coordinate values — input validation failure
- Service unavailable or upstream WorldCover data issue — server error response

## How this service works

Share of ESA WorldCover 2021 pixels classified as built-up. The coordinate is validated against the Natural Earth boundary for Estonia; results outside it are rejected before payment.

## Output

A numeric value (fraction or percentage) representing the share of ESA WorldCover 2021 pixels classified as built-up within the analysis area around the supplied coordinate. The coordinate is validated against Estonia's Natural Earth boundary; requests outside Estonia are rejected before any 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-built-up-share-613188d7/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)