# HALOWERK Nordic Land – Built-Up Share (Iceland)

> HALOWERK Nordic Land – Built-Up Share (Iceland) 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 for a given WGS84 coordinate within Iceland's boundary.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/is-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-built-up-share-iceland-967d1701
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zqdBAbYi4AGD5K50W_rae

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-built-up-share-iceland-967d1701 -d '<json body>'
```

Example prompt: What share of the land around latitude 64.135, longitude -21.895 in Reykjavik, Iceland is classified as built-up according to ESA WorldCover?

## When to prefer this

Choose this endpoint when you need pixel-level ESA WorldCover 2021 built-up land share for a specific coordinate in Iceland, especially when precise boundary validation (pre-payment rejection for out-of-bounds coordinates) is important. Prefer this over generic land-use APIs when you specifically need the ESA WorldCover classification and are working within the Iceland geographic scope.

## Known failure modes

- Coordinate outside Iceland's Natural Earth boundary — request rejected with a validation error before payment
- Latitude or longitude outside the European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Malformed or missing coordinate fields — 400-level input error
- Service unavailability or timeout — 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 Iceland; results outside it are rejected before payment.

## Output

A numeric share (fraction between 0 and 1, or percentage) representing the proportion of ESA WorldCover 2021 pixels at the queried coordinate classified as built-up. Coordinates outside Iceland'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-built-up-share-iceland-967d1701/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)