x402 protocolRobinhood Chain, 4663USDG micropayments

Charge for your API in 60 seconds.

Paste a URL, set a price, get back a paid endpoint. Your buyers never sign up, never see an invoice and never fill in a payment form. They just sign one message. Works the same whether a person or an agent is paying.

Create your endpoint Read the docs

one sale, two requests, one signature

$ curl https://hood402.com/p/ab12cd34

HTTP/1.1 402 Payment Required

{ "accepts": [{ "maxAmountRequired": "1000",

"asset": "USDG", "network": "eip155:4663" }] }

signing EIP-3009 transferWithAuthorization...

$ curl ... -H "X-PAYMENT: <signed authorization>"

HTTP/1.1 200 OK

{ "premium": "data" }

X-PAYMENT-RESPONSE: { txHash: 0x4f2a... } paid

$0.001

smallest price you can charge

HTTP calls per sale

signups for your buyers

integration targets

Three steps and you are selling

You can go from an idle API to one that earns USDG without leaving the page.

Point

Paste the URL of an API you already run, write a JSON response here, or upload static content. Your backend stays as it is.

Price

Pick what one request costs in USDG. Prices start at a tenth of a cent, and you choose between fixed and up-to pricing.

Publish

Hit generate. You walk away with a live paid URL, integration code for nine platforms, and a playground that proves it works.

What you get after that last click

Nothing to install

Three form steps and your endpoint charges money. No SDK, no config file, no protocol reading before you can start.

We hold the gate

Signature checks, replay protection and a receipt for every request happen on our side, in front of whatever you already run.

Or run it yourself

Copy generated middleware for Express, Next.js, Hono, FastAPI, Cloudflare Workers or Vercel Edge and keep everything in your stack.

Test with real signatures

The playground walks the actual 402, sign, retry loop using a throwaway wallet or your own. Nothing is faked, and nothing costs you.

See the money arrive

Revenue in USDG, success rate, who paid and which transaction settled it, refreshed every five seconds.

Agents can buy on their own

Payment terms are machine readable, your endpoints show up on a discovery feed, and you can export any of them as an MCP tool.

Questions people ask first

Your first paid endpoint is a minute away

Free to try on the built in test facilitator. No funds, no signup, the full protocol.

Start building