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Launching the open-source gateway

PostHog

PostHog  is an open-source product analytics platform. Connect it with Respan to forward LLM call events to PostHog and monitor LLM performance alongside your product analytics.

Set up Respan

Create an account at platform.respan.ai  and grab an API key . For gateway, also add credits  or a provider key .

The PostHog integration runs through the Respan gateway. Pass your PostHog credentials in posthog_integration and Respan forwards LLM events to your PostHog project.

Paste this into your coding agent:

Help me set up Respan tracing with the PostHog integration.
Follow https://www.respan.ai/docs/integrations/posthog.md

Setup

Create your PostHog account

Go to PostHog  and create an account. From your PostHog project settings , grab your PostHog API key and host.

Set environment variables

Terminal
export RESPAN_API_KEY="YOUR_RESPAN_API_KEY"
export POSTHOG_API_KEY="YOUR_POSTHOG_API_KEY"

Add posthog_integration to your request body

Python
import os
import requests

response = requests.post(
    "https://api.respan.ai/api/chat/completions",
    headers={
        "Content-Type": "application/json",
        "Authorization": f"Bearer {os.environ['RESPAN_API_KEY']}",
    },
    json={
        "model": "gpt-4.1-nano",
        "messages": [{"role": "user", "content": "Hello"}],
        "posthog_integration": {
            "posthog_api_key": os.environ["POSTHOG_API_KEY"],
            "posthog_base_url": "https://us.posthog.com",
        },
    },
)
print(response.json())

The posthog_base_url is usually https://us.posthog.com or https://eu.posthog.com.

Use the Respan template in PostHog

Use the official Respan template in PostHog  to create a dashboard for monitoring LLM performance.