Rucknium brought up your concern during today’s Monero Research Lab meeting, some people commented on it: https://libera.monerologs.net/monero-research-lab/20240410#c361656

there is:

IRC: irc://irc.libera.chat/#no-wallet-left-behind

Matrix: https://matrix.to/#/#no-wallet-left-behind:monero.social

nice catch! I will avoid them until they secure their infrastructure.

there is nothing that requires a perpetuals market to have a lower volume than the whole spot market for the underlying asset. perpetuals are derivative assets, the reason they exist is to enable trading regardless of access to the underlying asset’s supply.

side note: Binance will shut down their XMRUSD perpetuals with the delisting, but they will keep running their XMRUSDT perpetuals (USDⓈ-M XMRUSDT):

Please note that users may continue trading USDⓈ-M XMRUSDT and ANTUSDT Perpetual Contracts.

(https://www.binance.com/en/support/announcement/binance-will-delist-ant-multi-vai-xmr-on-2024-02-20-f73b083ba6834771b07dbe5319917ae5)

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).