The second largest stablecoin issuer, Circle, is expanding support for USDC across five leading blockchains USDC will now be available on Arbitrum One, Near, Polkadot, Optimism, and Cosmos In addition, the firm has also launched the Cross Chain Transfer Protocol to facilitate smooth interoperability for USDC across all chains. USDC will now be available on five additional blockchains, as per the announcement made by Circle on Wednesday.