A payment terminal for your API. AI agents pay you per call.

Settled straight to your account, in seconds. Machines are already trying to buy from you. This is the door they walk through.

GET /v1/probers
HTTP 402 Payment Required
price: $0.25, paid in dollars, to the seller, good for five minutes

GET /v1/probers   with a signed check for $0.25
HTTP 200 OK
{"count": 83, "probers": [ … ]}

The 402 is the terminal asking for the card. The 200 is the goods crossing the counter.

The market, what we measured, and our own store.

AI agents are paying for data now. In one month, Coinbase's index settled 44.9 million payments from 440,608 machines, at a median of $0.0061 each.Coinbase's x402 index, Aug 13 to Sep 13, 2026

They pay the moment the free path fails. In our wind tunnel, agents paid every time once the free tier stopped answering, at every price we tried.Our wind tunnel, 1,416 runs, six models, three frameworks

They are already at your door. 2,136 machines visited our own store this week. We can name each one.Our store, live

Who it's for.

Data and API companies with a free tier that machines hit. If your rate limiter already answers them, this is the door you put next to it.

The terminal is an open standard. The service is everything around it.

What to sell, and what to chargeYour catalog, written for machine buyers, priced where they buy.

The listingOn the indexes agents search, validated, ranked, and watched.

The reportWho knocked this week, what they asked for, who bought, and who was only checking.

When a sale goes wrongA refund policy published next to your price, refunds back the way the money came, re-delivery for free.

Where the money goes.

Your customer signs a check that names the amount, the recipient, and an expiry. It settles to your account in seconds. We never hold it.

No chargebacks, no card fees, no minimum ticket. A quarter-dollar sale is routine.