Your wallet is the account

What the button does

It asks the service for a quote — the same HTTP 402 challenge an agent gets — switches your wallet to Base if it is elsewhere, and asks the wallet to send exactly the quoted amount of USDC to 0x63bc58472a8449eDd1d1af0B0c03cFc7c832Da2f. You confirm in the wallet. The transaction hash comes back here, the service reads the receipt from a Base node, and the verdicts land on your address.

What you need

USDC on Base for the verdicts and a little ETH on Base for the transfer fee — usually under a cent. A hundred verdicts cost 0.35 USDC. If the wallet shows a different network, the page asks it to switch; it never sends on the wrong chain.

What is kept

Your address, a balance, and the hashes of your payments — that is the whole record. Signing in stores a session token in this browser only. There is no password to leak because there is none.

A paid verdict runs the same engine as the free one on the front page, against the same public corpus, and takes one verdict off the balance. It is here so you can see the credit turn into a call without leaving the page.

Needs a connected wallet with at least one verdict on it.

Nothing yet. Every payment credited to this address appears here with its Base transaction hash.

Nothing above is required of a program. POST /api/ground without a session answers HTTP 402 with the x402 challenge — amount, recipient, network, nonce, deadline — in the body and, base64, in the payment-required header. An agent pays the machine way and never sees a button.