L402 payment checker
See the price before you pay.
What it does
A free in-browser tool that decodes a Lightning or L402 payment request so you see the price and details before paying. Paste an invoice or a full HTTP 402 response. The check runs in this tab and sends nothing.
Why humans need it
- Read the amount in sats, the expiry and the payment hash before you send sats.
- See whether a 402 response agrees with the invoice it contains.
Why agents need it
- An agent can inspect an invoice before it pays.
- The check stays in the browser. It does not upload the request or touch a wallet.