x402swag.com sells holographic 402 stickers, terminal mugs, and robot tees — 49 designs of in-jokes for people building the agent economy. The unusual part is the checkout: every product can be bought by card like any normal store, or by paying USDC over x402 on Base. The same HTTP 402 flow our paid APIs run all day, pointed at a t-shirt.
Why bolt machine payments onto a t-shirt store
Partly because it's the funniest possible integration test. We spend all day writing about agents paying for API calls — structured data, deterministic responses, sub-cent prices. A physical hoodie is the exact opposite of all that, which makes it the honest stress test: order created, pay route answers HTTP 402 with the payment requirements, USDC settles on Base, the store answers 200, and dropship fulfillment kicks off automatically. No human in the loop until someone opens a mailbox.
If the rails can sell a mug, they can sell anything.
And partly because the designs deserved to exist. "sudo pay." "402 → OK." A robot ordering coffee: GET /coffee → 402 → 200. A robot buying its tired human a coffee. The kind of jokes that need zero explanation if you build agents and infinite explanation if you don't — which is what merch is for.
The numbers
- 49 designs across holographic stickers, die-cuts, mugs, tees, and crew necks
- 2 ways to pay every product: card checkout, or USDC over x402 on Base
- $3.99 where it starts — laptop stickers; nothing in the store needs a business case
A few of the shelves
Holographic 402 stickers — rainbow-shift die-cuts: the 402 OK pill, "Automated Agents Only" toll gates, "No Pay No Prompt" pixel bots, "sudo pay" terminals. The laptop-lid tier of protocol advocacy.
Terminal mugs — "sudo make coffee — permission denied." "How Agents Buy Coffee: GET /coffee → 402 → 200 OK." "You Look Tired Human," from a robot that bought you one.
Robot tees — "Hello Human." "Beep Boop Paid." "Insert USDC to Continue," featuring a robot feeding a coin into a 402 vending machine.
Humans welcome too
Card checkout works like any store. And if you'd rather your agent handles it — the pay route speaks fluent 402.
Background on how agent payments actually work: why AI agents need crypto, and what running 500+ paid endpoints taught us.
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