ChatGPT charges 4% per transaction. And for some reason, everyone is comparing t
By Vanessa Hung · February 17, 2026 · Curated by George's Blog
ChatGPT charges 4% per transaction.
And for some reason, everyone is comparing these fees: Amazon at 15%, ChatGPT at 4%. The math looks obvious.
But the comparison misses something critical: Amazon's 15% does not include fulfillment. FBA sellers pay that separately. FBM sellers handle logistics themselves and still pay the full 15%.
So what is the referral fee actually buying? Because a marketplace is a system built on six components:
➕ Discovery
➕ Catalog
➕ Transaction layer
➕ Fulfillment
➕ Memory
➕ and policy enforcement
Remove one, and the system weakens.
Over 30 years, Amazon built:
Discovery through search and advertising. Catalog with millions of ASINs and structured attribute data. Transaction layer via proprietary payment processing. Memory of purchase history across billions of transactions. Policy enforcement, including A-to-Z claims, reimbursements, and account health monitoring.
The 15% referral fee pays for access to this ecosystem. It covers all, trust, Buy Box, fraud protection, and data. Sellers pay for placement in a trusted environment where buyer intent is already established.
Even FBM sellers who never use FBA benefit from Amazon's demand aggregation and trust layer. They are paying for market access and systemic risk reduction.
ChatGPT currently has three of six components:
➕ Discovery through conversational AI.
➕ Catalog via Shopify.
➕ Transaction layer through Shopify.
It has no historical purchase memory yet. Policy enforcement is specific to each merchant/brand. It does not yet operate as a demand-concentrating marketplace with embedded trust at scale.
The 4% fee reflects this. OpenAI charges for discovery and transaction routing. Shopify provides backend support. Merchants handle fulfillment and risk independently.
Why memory is the actual competitive advantage:
Amazon's purchase history creates predictive behavior models. This data compounds. Every transaction makes the system smarter.
ChatGPT starts at zero. Conversational discovery allows it to build buyer intent from dialogue, but without transaction history, it cannot anticipate needs the way Amazon does.
This is what Andy Jassy described as agentic commerce. The system does not just respond to requests. It anticipates needs based on accumulated behavioral data. That infrastructure takes years to build and cannot be replicated with better AI models alone.
So, stop evaluating marketplaces by fee percentage alone.
A 4% fee on an incomplete system may cost more operationally than 15% on a complete one. The real comparison is the infrastructure versus operational burden.
Amazon’s 15% exists because it concentrates demand and absorbs structural complexity that sellers would otherwise have to build and fund themselves.
If you test ChatGPT, you are experimenting with discovery, not replacing Amazon.
What part of the marketplace formula do you think is hardest to replicate?
#Ecommerce #Operations #Marketplace #Amazon #ChatGPT