# HALOWERK Nordic Land – Depression Depth (Iceland)

> HALOWERK Nordic Land – Depression Depth (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 depression depth at a coordinate in Iceland, computed as the positive difference between the neighborhood mean elevation and the center cell elevation.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/is-depression-depth
- 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-depression-depth-iceland-1a983b31
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_utXmEtrK9j8Y_EhXgWQcQ

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-depression-depth-iceland-1a983b31 -d '<json body>'
```

Example prompt: What's the depression depth at latitude 64.1 and longitude -21.9 in Iceland — how much lower is that point compared to its surrounding neighborhood elevation?

## When to prefer this

Use this endpoint when you need a precise, Iceland-validated topographic depression depth metric — i.e., how much lower a specific point is than its immediate surroundings — particularly for land assessment, hydrology, drainage planning, or geospatial enrichment workflows focused on Iceland. It is preferable to generic elevation APIs when the depression-relative-to-neighborhood metric is specifically needed and when Iceland boundary validation is a requirement.

## Known failure modes

- Coordinate outside Iceland's Natural Earth boundary — request rejected before payment with a boundary validation error
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- No significant depression at coordinate — result may be zero or near-zero
- Service unavailable or upstream elevation data gap — HTTP 5xx error
- Malformed or missing coordinate fields — HTTP 400 bad request

## How this service works

Positive difference between the neighborhood mean and center elevation. The coordinate is validated against the Natural Earth boundary for Iceland; results outside it are rejected before payment.

## Output

A numeric depression depth value representing the positive difference between the mean elevation of the neighborhood and the center cell elevation at the given coordinate. Coordinates outside Iceland's Natural Earth boundary 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-nordic-land-depression-depth-iceland-1a983b31/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)