Stablecoins are cryptocurrencies pegged to stable assets, such as the US dollar. They provide the benefits of blockchain without the volatility that has plagued more traditional crypto tokens like Bitcoin. Elon Musk's team has reached out to crypto companies, and the company is negotiating with Stripe for integration. The goal is to realize Musk's ideal in an 'Everything' app that combines social media, payments, and commerce. Apple is also interested in the functionality of StableCoin through its Apple Pay infrastructure.