# Karte Halowerk Elevation Profile

> Karte Halowerk Elevation Profile is a paid API for AI agents from karte.halowerk.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Takes a list of coordinates and returns elevation, distance, gradient between consecutive points, total ascent/descent, steepest ramp, and mean gradient for the whole route.

## Facts

- Endpoint: POST https://karte.halowerk.com/v1/elevation-profile
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/karte-halowerk-elevation-profile-ddbecf5e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DXS7w2PWznl3fr_IerzN_

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 karte-halowerk-elevation-profile-ddbecf5e -d '<json body>'
```

Example prompt: Can you give me a full elevation profile for this cycling route — I have 8 waypoints along the climb to Alpe d'Huez — and resample every 100 meters so I can see the steepest ramp properly?

## When to prefer this

Choose this endpoint when you need detailed elevation statistics — including gradient per segment, total ascent/descent, steepest ramp identification, and mean gradient — for a route defined by a set of waypoints. The optional resampling along great-circle arcs makes it especially suited for sparse corner-defined routes where you want meaningful steepest-ramp figures. Prefer over simple elevation lookup endpoints when route-level statistics matter, not just point elevations.

## Known failure modes

- Invalid or out-of-range coordinates return an error
- Too few coordinates (less than 2 points) cannot produce gradients
- Resample interval too small may cause excessive point generation or timeout
- Coordinates over ocean or missing DEM coverage may return null elevations
- Malformed coordinate list returns 400 bad request

## How this service works

Takes a list of coordinates and returns the elevation at each, the distance and gradient between consecutive points, total ascent and descent, the steepest ramp with the segment it belongs to, and the mean gradient over the whole line. An optional resample interval inserts intermediate points along the great circle between the given ones, which is what makes a steepest-ramp figure meaningful on a route described by a handful of corners.

## Output

Returns per-point elevation values, distance and gradient between each consecutive pair of coordinates, cumulative total ascent and total descent for the full route, the steepest ramp with the segment it belongs to, and the mean gradient across the whole line. If a resample interval is provided, intermediate great-circle points are inserted before computing these statistics.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/karte-halowerk-elevation-profile-ddbecf5e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from karte.halowerk.com](https://www.zero.xyz/host/karte.halowerk.com/llms.txt)