# HALOWERK Baltic Land – Lithuania Built-Up Share (ESA WorldCover 2021)

> HALOWERK Baltic Land – Lithuania Built-Up Share (ESA WorldCover 2021) 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 (urban/impervious surfaces) for a given WGS84 coordinate within Lithuania.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/lt-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-lithuania-built-up-share-esa-worldcover-2021-92b4db60
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nFDWaIHdbMyRC3jiEZbzp

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-lithuania-built-up-share-esa-worldcover-2021-92b4db60 -d '<json body>'
```

Example prompt: What share of the land around latitude 54.6872, longitude 25.2797 in Lithuania is classified as built-up according to ESA WorldCover 2021?

## When to prefer this

Use this endpoint when you need ESA WorldCover 2021 built-up surface share specifically for a coordinate in Lithuania. It is ideal for land-use analysis, site suitability assessments, environmental baselines, and urban density queries for Lithuanian locations. Prefer this over general geocoding or population-density APIs when you need satellite-derived land cover fractions rather than administrative or census data.

## Known failure modes

- Coordinate outside Lithuania boundary — request rejected, no charge applied
- Latitude or longitude outside European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed or missing coordinate parameters — schema validation error
- Payment failure — x402 payment not completed, request not processed

## How this service works

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

## Output

A numeric fraction (share between 0 and 1) representing the proportion of ESA WorldCover 2021 pixels in the analysis area classified as built-up/impervious surface at the given coordinate within Lithuania. Coordinates outside the Lithuanian boundary are rejected before any charge is incurred.

## 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-lithuania-built-up-share-esa-worldcover-2021-92b4db60/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)