# HALOWERK Nordic Land – Sweden Built-Up Area Share

> HALOWERK Nordic Land – Sweden Built-Up Area Share is a paid API for AI agents from nordland.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/developed land) for a given coordinate within Sweden.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/se-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-nordic-land-sweden-built-up-area-share-326ff8d0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9fDd5rOHxlVdQYd3kU-7b

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-nordic-land-sweden-built-up-area-share-326ff8d0 -d '<json body>'
```

Example prompt: What share of the land around latitude 59.33, longitude 18.07 in Sweden is classified as built-up according to ESA WorldCover?

## When to prefer this

Choose this endpoint when you need a fast, pay-per-call lookup of ESA WorldCover 2021 built-up land cover share for a specific point within Sweden, without needing to manage satellite data pipelines or GIS infrastructure. It is ideal when your workflow requires validation that the coordinate falls within Sweden before incurring cost, and when you want standardized 2021 WorldCover land classification rather than more recent or proprietary urban datasets.

## Known failure modes

- Coordinate outside Sweden boundary — rejected before payment with a boundary validation error
- Coordinate within European bounding box but outside Sweden polygon — rejected
- Latitude or longitude outside the published European coverage bounds (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Malformed or missing coordinate fields — input validation error
- Service unavailable or upstream WorldCover data error — 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 Sweden; results outside it are rejected before payment.

## Output

A numeric share (fraction or percentage) representing the proportion of ESA WorldCover 2021 pixels classified as built-up within the analysis area surrounding the provided coordinate. The coordinate is pre-validated against the Natural Earth boundary for Sweden; requests outside Sweden 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-nordic-land-sweden-built-up-area-share-326ff8d0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nordland.halowerk.com](https://www.zero.xyz/host/nordland.halowerk.com/llms.txt)