# HALOWERK Baltic Land – Built-Up Share (Germany)

> HALOWERK Baltic Land – Built-Up Share (Germany) 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 for a given WGS84 coordinate within Germany.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/de-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-built-up-share-germany-c1085017
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-dByGhRORYyQiAiICK4gX

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-built-up-share-germany-c1085017 -d '<json body>'
```

Example prompt: What share of ESA WorldCover 2021 pixels are classified as built-up at latitude 52.52 and longitude 13.405 in Berlin, Germany?

## When to prefer this

Choose this endpoint when you need a precise, pixel-level built-up land cover fraction for a specific coordinate within Germany, sourced from the authoritative ESA WorldCover 2021 dataset. It is ideal for urban density analysis, site suitability assessments, environmental impact evaluations, or any workflow requiring verified land-use classification at a point location in Germany. Prefer this over generic geocoding or demographic density APIs when you specifically need remote-sensing-derived built-up area fractions rather than population or address data.

## Known failure modes

- Coordinate outside Germany's Natural Earth 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 failure
- Malformed or missing coordinate fields — HTTP 400 or schema error
- Service unavailable or upstream ESA WorldCover data access failure — HTTP 5xx

## How this service works

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

## Output

A numeric value representing the share (fraction or percentage) of ESA WorldCover 2021 pixels within the analysis area around the given coordinate that are classified as built-up land. The coordinate must fall within Germany's Natural Earth boundary; coordinates outside this boundary 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-built-up-share-germany-c1085017/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)