What is the most popular bridge crypto?

Could you please elaborate on what you mean by "bridge crypto"? Are you referring to a cryptocurrency that acts as a bridge between different blockchains or networks, allowing for the seamless transfer of assets and data? If so, it's important to note that the popularity of such cryptocurrencies can vary greatly depending on the specific use case, the community support, and the overall market conditions. That being said, some popular bridge cryptocurrencies include projects like Polkadot, Cosmos, and Avalanche, which all aim to provide interoperability between different blockchains. However, it's difficult to definitively say which one is the "most popular" as this can change over time and depends on various factors. It's always a good idea to do your own research and evaluate the pros and cons of each project before making any investment decisions.