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> All of the above exchange links that I've visited required account registration and login, which means that they are not decentralized
Next you'll tell me that Ether is centralized because Coinbase requires registration and login.
You've been looking at clients, i.e. independently developed user interfaces to the Stellar DEX. You can interact directly with the DEX here:
https://laboratory.stellar.org/
Or you can roll your own. Stellarterm is open source, could be a good starting point:
https://github.com/stellarterm/stellarterm
If you prefer algorithmic trading, there is Kelp:
https://github.com/stellar/kelp
> Claiming to be decentralized and then requiring signup is dishonest.
I find it hard to believe that you honestly don't understand the difference between an independently developed client and the decentralized exchange which it connects to. Regarding automated market making, see Kelp above.
> There are no non-custodial stablecoins
This subthread started with your recommendation of USDC, a custodial stablecoin.