Good eye. A ~5% surcharge on prepaid credits is the standard model right now for most multi-LLM services. We actually do not use OpenRouter internally, so this number is flexible. One thing I'll note is that we try to be as upfront and transparent about our platform fee as possible so that no one is surprised.
Oh interesting. I've previously looked into implementing it myself but seemed like it would require a lot of effort. I would love to connect and learn more about your implementation. What's the best way to reach out to you? My email is available on my profile.
Interesting, what do you use if not Openrouter?
I'm biased, but like Vercel's AI Gateway https://vercel.com/docs/ai-gateway