Project showcase — Grantex
Grantex is agentic payment infrastructure. An AI agent calls one API, receives a single-use virtual card with network-enforced spending controls, completes a purchase, and the card ceases to exist. No checkout. No human in the loop.
< 300ms
Card creation to credential
Zero
Human touchpoints per transaction
MCP
Any agent framework, one line of config
Live demo
Transaction flow
01
Agent receives task
02
Grantex API called
03
Virtual card issued
04
Purchase executed
05
Card destroyed
06
Receipt logged
How it works
01 — Policy
Rules baked into the credential
Spending controls are encoded at the payment network level. Merchant category locks, amount caps, and single-use expiry are enforced by the network itself. Not software instructions an agent can reason around.
02 — Credential
Disposable by design
Each transaction generates a fresh virtual card. Created for one purpose, used once, and then ceases to exist. No standing credential that can be extracted, reused, or compromised after the fact.
03 — Protocol
Native to any agent
An MCP server means any agent framework can call Grantex with one line of configuration. Claude, LangChain, AutoGPT. No SDK, no custom integration. Payment becomes a native agent capability.
The thinking behind it
"We had to build this from scratch because it does not exist natively in most issuer products today. The agent cannot work with a credential it cannot interrogate. A static card number with no machine-readable parameters is invisible to an agent making a routing decision."
From “I built agentic payments infrastructure. Here is what nobody is talking about.” — Sean McAuliffe
A working prototype, built to think with.
Grantex is not a company. It's a credibility build — vision to running prototype in a handful of weekends, using Claude Code, Lovable, Supabase, and GitHub. I built it to pressure-test a thesis I'd been writing about: AI agents need payment credentials they can interrogate, not static card numbers. The essay that came out of the build is below.
If you've got a fintech idea you need rendered as a working prototype — fast, by someone who knows the domain — that's what I do. The Grantex build is what it looks like.