# HALOWERK Nordic Land – Finland Built-Up Share

> HALOWERK Nordic Land – Finland Built-Up 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 land cover for a given coordinate within Finland.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/fi-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-finland-built-up-share-6f28dfec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NErmq2mRlIpa0m58uUQS4

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-finland-built-up-share-6f28dfec -d '<json body>'
```

Example prompt: What share of the land around coordinates 60.1699° N, 24.9384° E in Finland is classified as built-up according to ESA WorldCover 2021?

## When to prefer this

Choose this endpoint when you need a precise, satellite-derived built-up land cover fraction for a specific point in Finland using ESA WorldCover 2021 data. It is ideal for urbanization assessments, site suitability analyses, environmental reporting, or real estate due diligence where a pay-per-call model is preferred over a subscription GIS service. The pre-payment boundary validation for Finland ensures you are not charged for out-of-scope coordinates.

## Known failure modes

- Coordinate outside Finland's Natural Earth boundary — request rejected before payment, no charge incurred
- Coordinate within European bounding box but outside Finland polygon — validation rejection
- Latitude or longitude out of published European range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Network or service unavailability returning 5xx error
- Malformed request body missing required coordinate fields

## How this service works

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

## Output

A numeric value representing the share (fraction or percentage) of ESA WorldCover 2021 pixels classified as built-up land within the analysis area around the provided Finnish coordinate. Coordinates outside Finland's Natural Earth boundary are rejected before any payment is charged.

## 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-finland-built-up-share-6f28dfec/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)