Auth + paywalls for MCPs
The next AI economy belongs to the builders.
Authflow Rails adds authentication and paywalls to MCP servers. Connect your server, set your price, and let subscribers sign in and pay through your own Stripe account.
Why now
12,000+ servers.
Under 5% earn.
The supply side is built. The monetization layer is not. That gap is the product.
Sign-in became required.
AI tools now have to ask who’s calling. Almost none of them get paid for answering.
Marketplaces take a fifth — and the customer.
Login providers stop at the login. Nobody holds both halves.
That’s the opening.
A powerful tool shouldn’t need an entire software business built around it just to get paid.
A new building block
APIs connected software.
MCPs connect AI to what your software can do.
MCP is an open, evolving protocol that lets AI work with tools, data, and services.
For builders, that opens a bigger possibility: what you’ve built can become part of someone’s AI workflow.
The protocol is evolving.
The opportunity is taking shape.
How it works
The paywall is
the sign-in screen.
Someone adds your tool. They’re asked to sign in. When access requires it, checkout sits inside that sign-in. A key comes back. The tool runs.
The deal
Free to start.
9% when you charge.
With current standard pricing, you keep 91% of each payment before Stripe’s fees. Your Stripe. Your customers. The charge lands on your account.
Your tool. Your terms.
Subscriptions, usage credits, or free authenticated access.
Your Stripe. Your customers.
The charge lands on your account. We never hold the money.
Current standard pricing.
A 9% platform fee when someone pays, plus Stripe’s processing fees. Ask us about enterprise pricing.
Receipts
The platform died.
The rail did not.
$65k+ for AI creators since 2024. Two years of processing real money on a surface someone else could deprecate. Then they did.
From our beginnings with custom GPTs to the MCP era, the belief stays the same: builders should benefit from what they create. The surface was wrong. The problem was right.
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