# HALOWERK Baltic Land – Latvia Depression Depth

> HALOWERK Baltic Land – Latvia Depression Depth is a paid API for AI agents from baltikum.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the positive difference between neighborhood mean elevation and center cell elevation (depression depth) for a given coordinate within Latvia.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/lv-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-baltic-land-latvia-depression-depth-aaca7a4e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4lMIEVKiM6T9varS_762Y

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-baltic-land-latvia-depression-depth-aaca7a4e -d '<json body>'
```

Example prompt: What's the depression depth at latitude 56.946 and longitude 24.105 in Latvia — I need to know how much lower that point is compared to its surrounding terrain.

## When to prefer this

Use this endpoint when you need the topographic depression depth (neighborhood mean minus center elevation) for a specific point within Latvia. It is ideal for hydrological analysis, flood risk assessment, agricultural drainage planning, or infrastructure siting where local sink depth matters. Prefer this over general elevation APIs when you specifically need the depression metric relative to surroundings rather than absolute elevation.

## Known failure modes

- Coordinate outside Latvia boundary — rejected by Natural Earth validation before payment, returns error
- Coordinate outside the broader European coverage bounding box — schema validation failure
- Non-numeric or malformed latitude/longitude values — schema validation error
- Network timeout or service unavailability — standard HTTP 5xx error

## How this service works

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

## Output

Returns a numeric value representing the positive difference (in meters) between the mean elevation of the surrounding neighborhood cells and the elevation at the queried center coordinate, indicating how depressed the terrain is at that point. Coordinates outside Latvia are rejected with a validation error 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-baltic-land-latvia-depression-depth-aaca7a4e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from baltikum.halowerk.com](https://www.zero.xyz/host/baltikum.halowerk.com/llms.txt)