The top 10 cryptocurrencies by market cap are as follows:

1. Bitcoin (BTC)

2. Ethereum (ETH)

3. Binance Coin (BNB)

4. Cardano (ADA)

5. Tether (USDT)

6. Solana (Sol)

7. Ripple (XRP)

8. Polkadot (DOT)

9. Dogecoin (DOGE)

10. US Dollar (USDC)

Please note that the cryptocurrency market is highly volatile, and the rankings can change rapidly. I recommend checking a reliable cryptocurrency market data website or app for the most up-to-date information.