Solana's coin, also known as its native token, is the Solana SOL. Currently there are 339 million Solana SOL in circulation as of May 2022, and 522 million fully-diluted SOL. At $50 per SOL, that implies Solana has a market capitalization of $17 billion, and a fully-diluted market capitalization of $26 billion.
Various sites on the internet show total Solana circulating supply, market capitalization, and inflation rates. It's important to note that the methodology can vary by site, so numbers may not match up perfectly.
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