---
title: "Arne Kellmann — API Sandbox"
description: "Published Arne Kellmann website information and agent integration guidance."
canonical: https://arnekellmann.de/sandbox
last-updated: 2026-09-07
---

# Arne Kellmann — API Sandbox

Test public API reads without an account or API key. This sandbox returns the real published service catalog; it is not an isolated environment for writes.

GET https://arnekellmann.de/api/sandbox/v1/services?language=en

curl --fail 'https://arnekellmann.de/api/sandbox/v1/services?language=en'

Expected: HTTP 200 and JSON with language, four services, pricing and contactUrl. Invalid languages return HTTP 400; observe Retry-After on HTTP 429.

No messages, bookings or payments. Contact forms are not sandbox test targets. Credentials and personal test data are unnecessary.