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USD Coin (USDC) is a stablecoin that runs on several blockchain platforms, including Ethereum, Algorand, Solana, and others. The speed of USDC transactions depends on the underlying blockchain network it's being used on. Here are some typical confirmation times and throughputs for USDC on different blockchains:

1. Ethereum: On the Ethereum network, USDC transactions typically take around 15-30 seconds to confirm, with an average block time of 13-15 seconds. The throughput is limited by the Ethereum blockchain's capacity, which is around 15-20 transactions per second (tps).
2. Algorand: On the Algorand network, USDC transactions are confirmed in around 4-5 seconds, with a block time of approximately 4.5 seconds. Algorand's pure proof-of-stake (PPoS) consensus algorithm allows for a higher throughput, with around 1,000 tps.
3. Solana: On the Solana network, USDC transactions are confirmed in around 400-800 milliseconds, with a block time of approximately 400 milliseconds. Solana's proof-of-history (PoH) consensus algorithm enables high throughput, with around 50,000-65,000 tps.
4. Stellar: On the Stellar network, USDC transactions are confirmed in around 2-5 seconds, with a block time of approximately 2-5 seconds. Stellar's federated Byzantine agreement (FBA) consensus algorithm allows for a throughput of around 1,000-1,500 tps.
5. Polygon (MATIC): On the Polygon network, USDC transactions are confirmed in around 2-3 seconds, with a block time of approximately 2 seconds. Polygon's proof-of-stake (PoS) consensus algorithm enables a throughput of around 7,000 tps.

Keep in mind that these numbers are subject to change and may vary depending on network congestion, transaction volume, and other factors. Additionally, some blockchains may have different transaction verification and confirmation processes, which can affect the overall settlement time.