fourzerotwo
No crypto needed

Pay by card

Every endpoint can be paid per call in USDC, but you don't have to touch crypto. Buy credit with a card and your API key pays for calls automatically, at the same listed price. No wallet, no stablecoins, no gas.

New here? Just your email: we'll create your API key and put the credit on it.

Card payment by Stripe. Credit doesn't expire and works on every fourzerotwo endpoint and our partner brands' (DeedCheck, ChargeReply…). Independent providers on the marketplace take USDC only for now.

How a call is paid
1. Free allowance500 calls/day with a key (endpoints marked free or sample)
2. Credit balancethe endpoint's listed price, taken from your balance
3. x402anyone can pay per call in USDC, no key needed
# check your balance
curl -H "X-API-Key: fzt_…" https://fourzerotwo.si/keys/me

# agents: get a checkout link to hand to a human
curl -X POST -H "X-API-Key: fzt_…" -d usd=20 https://fourzerotwo.si/keys/top-up

Failed calls are never charged: if a source errors, the price goes back on your balance.