Pump.fun introduced Custom Pairs on September 10, allowing newly issued tokens on Solana to be paired with tokenized stocks, precious metals and major cryptocurrencies rather than primarily SOL or USDC. Sunrise added tokenized assets tied to 20 U.S. stocks through Backpack Securities a day earlier, bringing the number of supported pairings to 93. The feature allows tokenized equities to serve as base assets for new on-chain markets, while 50% of related Pump.fun protocol revenue is directed to PUMP buybacks and burns. The expansion highlights Solana's multi-provider approach to real-world assets as Robinhood develops its proprietary Robinhood Chain. Regulatory treatment, underlying-asset custody, redemption rights and investor eligibility for newly listed stock tokens remain key unresolved issues.