chaser

I'm happy with it. it has more momentum than I expected. you can highly customize to the content you see, which is great.

on the major existing decentralized exchange, Bisq, you already have a publicly observable price feed for XMRBTC. you can calculate XMRUSD based on that and a BTCUSD price feed that you trust.

DEXs that are in the making, namely Serai and Haveno, both plan to have at least one XMR pair with an Ethereum-based dollar-pegged coin. I suppose, although I'm not sure, that at least in the case of Serai the trades on that pair will have publicly observable prices.

Haveno will also have non-blockchain, actual fiat (cash, wire, payment apps) pairs with XMR.

you can take sources like this and calculate an average or a median. current price aggregators, like coin listing sites, will probably do the same, so it's likely that even in a DEX-only future you'll get your prices from the same sources as today.

heads up about the screenshots -- when you need to obscure text (or anything else) on a picture, don't use blurring, pixelization or similar effects. they can be brute-forced and the original text can be retrieved, with trivial computing power. always use color fill to obscure data, and don't make it exactly as big as the data is (~visual padding).

"bloat" would be an exaggeration. if you take 1 in / 2 out transactions as representative, it's a ~2% increase in transaction size (presuming knaccc's numbers apply to the presently used Bulletproofs+ transaction format).

this concept has been discussed before as "return addresses". it would marginally increase the transaction size and thus the storage requirements, but it's possible and seems reasonable. it looks like no one pursued it since knaccc formalized it. nevertheless it's on the roadmap ("Future" tab).

https://old.reddit.com/r/Monero/comments/b0gjud/monero_return_addresses_who_would_use_this_feature/

https://github.com/monero-project/research-lab/issues/53