# HALOWERK Atlantic Land – France Built-Up Land Share

> HALOWERK Atlantic Land – France Built-Up Land Share is a paid API for AI agents from atlantikland.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 coordinate within France.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/fr-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-atlantic-land-france-built-up-land-share-2837645f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YXTEXeXcEFcGLnvGROIQM

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-atlantic-land-france-built-up-land-share-2837645f -d '<json body>'
```

Example prompt: What share of the land around latitude 48.8566, longitude 2.3522 in France is classified as built-up according to ESA WorldCover 2021?

## When to prefer this

Choose this endpoint when you need ESA WorldCover 2021–based built-up land share specifically for a point within France, with boundary pre-validation to avoid wasted payments. Prefer it over generic land-use APIs when you need satellite-derived, pixel-level classification accuracy at low per-call cost.

## Known failure modes

- Coordinate outside France boundary: request rejected before payment, error indicating invalid location
- Coordinate outside European coverage bounds (lat 34–72.5, lon -31.5–40.5): validation error
- Missing or malformed latitude/longitude fields: input schema validation error
- Service unavailable: HTTP 5xx error

## How this service works

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

## Output

A numeric share (proportion or percentage) indicating what fraction of ESA WorldCover 2021 pixels within the analysis grid around the given coordinate in France are classified as built-up land cover. Coordinates outside the validated France boundary are rejected before 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-atlantic-land-france-built-up-land-share-2837645f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from atlantikland.halowerk.com](https://www.zero.xyz/host/atlantikland.halowerk.com/llms.txt)