x402 Paywall Demo: Paying Over HTTP 402

Why try x402

This section is the free preview. Every reader and every search engine can read it.

x402 turns HTTP 402 Payment Required into a payment path that actually completes: the client signs the payment requirements carried in the 402 response with a wallet, the server hands the signature to a facilitator for verification and on-chain settlement, and then returns the full text. No accounts, no subscription, no redirect to a third-party checkout page — all of it inside one request.

The price is a symbolic $0.10 USDC. The point is not revenue. It is finding out whether "pay a tiny amount once, for one article" holds together as engineering.

This runs on the base-sepolia testnet and involves no real money. Testnet USDC comes free from a faucet and has no economic value — the payer is not out a cent, and the site owner does not gain one.

This article is not served to visitors in mainland China; requests from there receive 451 Unavailable For Legal Reasons. This site does not offer paid content in that jurisdiction, for the same class of reason that exchanges geo-block specific jurisdictions. It returns 451 rather than 404 because the content does exist and is merely being withheld, and a reader deserves to be told which of those it is.