x402, made simple.
Paying on the internet without accounts, cards, or checkout forms. Three tiny demos explain it better than any wall of text. Click everything.
The whole idea, in one breath
The web has had a built-in code for 'please pay' since 1997: 402. It just never got used. x402 is the rulebook that finally puts it to work.
That is honestly most of it. The rest of this page lets you feel it.
Demo 1 · The snack machine
Every x402 payment works exactly like a snack machine. Pick a snack, watch what the machine's little screen says, then pay it.
drop tray
Ask → price → pay → receive. You just ran the whole protocol.
Demo 2 · Ask a real server for its price
This website sells reports the x402 way. Hit the button and watch a real 402 answer come back. Nothing is charged; you are only window shopping.
Peek at the raw machine answer (JSON)
Demo 3 · The whole loop, in ten seconds
Press play. A client buys a tiny report for half a cent, start to finish.
Four words, zero jargon
402
The web's built-in 'please pay' signal. Reserved since 1997, waiting for a job. Now it has one.
Wallet
An app that holds your digital money and signs payments. It replaces the signup form, the card form, and the password, all at once.
USDC
A digital dollar. Moves in seconds, worth about a dollar, and precise enough for prices like half a cent.
Signature
The digital yes. Made for one exact payment: this amount, to this seller. Nothing else can ever be taken.
Quiz · Three questions, twenty seconds
Click an answer. Wrong ones just wobble and let you try again.
1 · A website answers '402'. What does it want?
Exactly. 402 is the old 'payment required' signal, finally doing its job.
2 · What replaces the account, the card form, and the password?
Right. The signature does all three jobs in one go, and it works for humans and robots.
3 · Who sets the exact price you pay?
Right. The price was in the 402 answer; the signature only ever covers exactly that.
You understand x402.
Now what?
The same story, technical: headers, code examples, ecosystem numbers, and the pitfalls to avoid.
Watch it happen live →Buy a real report for half a cent, from this very site, with a real wallet.
See this minute in numbers →How much the whole x402 ecosystem moved, measured continuously.
x402 Trust watches thousands of these endpoints around the clock and turns the observations into trust scores. This page is the friendly tour; the data is real.