Right, I was gonna say that that is far more likely done by an exchange that issues a coin rather than by a coin that constructs an exchange... and, we already have one = Binance BNB!!
The point I was making is that somewhere along the chain one either needs a licence or contract with a bank or, as u said P2P, which requires huge trust. or much better live escrow systems, similar to bridges.
Binance BNB is no different, as it offers no fiat buying which is the heart of this topic.
Binance accepts credit cards for crypto purchases.
I'm dead to Binance, they are dead to me.
The real Binance cut me off quite some time ago because I'm in the U.S., and their fake U.S. company quickly gained a reputation for theft that it took Coinbase some time to build.
Like Coinbase, they are getting Trustpilot to delete a huge amount of bad reviews and they still have a horrible rating of 1.2 out of 5.
https://www.trustpilot.com/review/binance.us
As much as the regulators here in the U.S. keep claiming to regulate for the safety of us citizens, they have turned a blind eye for years on these exchanges simply keeping your money and with their silence sending a clear message to fuck off, they aren't giving you the money back.
I also no longer have a functioning Binance ac.
Financial regulation is designed to shaft the individual while promoting a rat-run of scammers to operate from offshore havens for a fat fee. This includes crypto now. Long ago had some interesting meetings with people who facilitate such arrangements, and the available options. All thick as thieves - legalised criminals.