OpenAI recently introduced a 4% checkout fee for Shopify merchants selling through ChatGPT. It looks like a simple transaction cost but it signals something much bigger in the evolution of agentic commerce.
At 4%, it’s cheaper than Amazon’s 8–15% referral fees. But this isn’t about price. It’s about control. Where Amazon charges for access to traffic, OpenAI is positioning itself as the system that shapes the purchasing decision itself. The fee is simply the first step in claiming that ground.
