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They're using the lightning network on top of Bitcoin for instant transactions and less than 1 cent fees.

If Bitcoin equals cash, Lightning is Venmo

The lightning basically network syncs to Bitcoin in large atomic updates to limit fees.

Hope that helps

Chivo doesn't use Lightning internally - it's just a PayPal-like custodial payment system in itself. (It does talk Lightning, though reportedly unreliably.)

You could argue the same for Strike -- sending $USD or BTC between users on Strike doesn't use lightning, but if you want to send to a user not on Strike it uses Lightning.

Or Cash App by Square or Venmo by Paypal -- when you send Bitcoin to another user it's just moved internally in their accounting, not on the blockchain.

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