n4n.pay
Payments for the n4n fleet — PayPal + self-custody crypto
One hosted checkout and a small API for the whole n4n fleet: take PayPal or on-chain stablecoins, keep the keys yourself, and get signed webhooks when a payment settles.
PayPal
Hosted checkout with instant capture and webhook confirmation.
Self-custody crypto
USDC & USDT on Ethereum, watched to your own xpub — no custodian.
Signed webhooks
HMAC-signed events with retries when an intent settles or expires.