# HALOWERK Southern Land – Spain Built-Up Share (ESA WorldCover 2021)

> HALOWERK Southern Land – Spain Built-Up Share (ESA WorldCover 2021) is a paid API for AI agents from suedland.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 land for a given coordinate within Spain.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/es-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-southern-land-spain-built-up-share-esa-worldcover-2021-150e3e02
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ln1rf5bfm1j3BzLLnB7BD

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-southern-land-spain-built-up-share-esa-worldcover-2021-150e3e02 -d '<json body>'
```

Example prompt: What share of ESA WorldCover 2021 pixels are classified as built-up around latitude 40.4168, longitude -3.7038 in Spain?

## When to prefer this

Choose this endpoint when you need the specific ESA WorldCover 2021 built-up land-cover fraction for a point within Spain. It is purpose-built for Spain with boundary validation, making it more reliable than generic global land-cover APIs for Spanish coordinates. It complements the other HALOWERK Southern Land endpoints (grassland share, soil properties, elevation, dominant cover class) for multi-dimensional land analysis in Spain.

## Known failure modes

- Coordinate outside Spain boundary: rejected before payment with a validation error
- Latitude or longitude out of published European coverage range (lat 34–72.5, lon -31.5–40.5): rejected
- Malformed or missing coordinate fields: schema validation error
- Network or service timeout: no result returned
- Payment failure via x402 protocol: 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 Spain; results outside it are rejected before payment.

## Output

A numeric share (fraction or percentage) of ESA WorldCover 2021 pixels classified as built-up within the analysis area surrounding the given coordinate. Coordinates outside the Natural Earth boundary for Spain are rejected before any charge is applied.

## 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-southern-land-spain-built-up-share-esa-worldcover-2021-150e3e02/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suedland.halowerk.com](https://www.zero.xyz/host/suedland.halowerk.com/llms.txt)