As of now, the top 10 altcoins by market capitalization are:
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Ethereum (ETH)
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Binance Coin (BNB)
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Cardano (ADA)
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Solana (SOL)
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XRP (XRP)
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Polkadot (DOT)
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Dogecoin (DOGE)
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Avalanche (AVAX)
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Terra (LUNA)
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Chainlink (LINK)
Please note that the rankings may change based on market conditions and fluctuations in the cryptocurrency market.