OpenRouter raised a $113M Series B in spring 2026 at roughly $1.3B. Stripe is now paying over $7 billion. Same company, same product, one quarter apart.
One API key, 400+ models
OpenRouter isn’t an app or an agent. It’s a gateway: a single OpenAI-compatible endpoint that fronts 400+ models from 70+ providers, with automatic failover when a lab rate-limits you and pass-through pricing instead of a per-token markup. Swap the base URL, keep your existing SDK code, change model from a Claude string to a Qwen string, get one bill. Founder Alex Atallah — previously CTO of OpenSea — has pitched it as “Stripe for AI” since 2023. That framing aged well.
Why Stripe paid up
Scale is the answer: ~8 million users and roughly 27 trillion tokens routed per week, up 5x in six months. That’s not a model company, it’s a metering company — every request is a priced, billable event. Stripe just bought the tollbooth between agents and models, before agent-to-model traffic becomes a bigger payment rail than card checkout.
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