checkout402_

Create a checkout

Put a paid URL in front of your API. Agents and humans pay the same link.

Not signed in. Sign in by email to create a checkout — or paste a c402_ API key at the bottom of the form.

Called only after payment settles. Must be https (public).

GraphQL, search and bulk lookup are usually POST.

Encrypted at rest and sent only server-to-server. The buyer pays to use it and never sees it. Not shown again after you save.

Only for “API key header”. Leave blank otherwise.

Or sign in with a wallet first — session cookie works too.

Sell a package: one payment, one on-chain settlement, this many calls. That is how per-call prices below a cent work — the fee is paid once, not per call. Packages must be priced at $1.00 or more.