# HALOWERK Nordic Land – Finland Depression Depth

> HALOWERK Nordic Land – Finland Depression Depth 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 positive elevation difference between a neighborhood mean and the center cell elevation, indicating topographic depression depth at a given coordinate within Finland.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/fi-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-finland-depression-depth-f80f784d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zRA3yyY9Lp5oyv6qhU7mo

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-depression-depth-f80f784d -d '<json body>'
```

Example prompt: What is the depression depth at latitude 60.45, longitude 25.12 in Finland? I need to know how much lower the center is compared to the surrounding neighborhood elevation.

## When to prefer this

Choose this endpoint when you need terrain depression depth specifically for coordinates within Finland and want a pre-validated, pay-per-call micro-service that rejects out-of-boundary requests before charging. It is preferable over generic elevation APIs when you specifically need the neighborhood-mean-minus-center metric for hydrological, agricultural, or ecological analysis in Finland.

## Known failure modes

- Coordinate outside Finland boundary: request rejected before payment, error indicating coordinate is outside valid coverage area
- Latitude or longitude outside published European bounding box (34–72.5°N, -31.5–40.5°E): schema validation error
- Network or service unavailability: HTTP 5xx error
- Flat terrain with no depression: returns zero or near-zero value, not an error
- Malformed request body: 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 Finland; results outside it are rejected before payment.

## Output

A numeric value representing the depression depth in meters — specifically the positive difference between the neighborhood mean elevation and the center cell elevation at the queried coordinate. A higher value indicates a deeper topographic depression. Coordinates outside Finland's Natural Earth boundary are rejected before any charge is incurred.

## 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-depression-depth-f80f784d/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)