As of 2024, the top cryptocurrencies in the Yemeni city of Sana'a may include:

1. Bitcoin (BTC): Bitcoin is the original and most well-known cryptocurrency, with a strong track record and widespread acceptance. It is likely to remain a popular choice in Sana'a due to its stability and liquidity.

2. Ethereum (ETH): Ethereum is a decentralized platform that enables smart contracts and decentralized applications to be built and run without any downtime, fraud, control, or interference from a third party. It is highly popular and has a strong community of developers, making it a top choice in Sana'a.

3. Ripple (XRP): Ripple is a digital payment protocol that enables fast, low-cost international money transfers. It has partnerships with major financial institutions around the world, making it a popular choice for cross-border transactions in Sana'a.

4. Litecoin (LTC): Litecoin is a peer-to-peer cryptocurrency created as a "lighter" version of Bitcoin. It has faster transaction times and lower fees, making it a popular choice for everyday transactions in Sana'a.

5. Cardano (ADA): Cardano is a blockchain platform that aims to provide a more secure and scalable infrastructure for the development of decentralized applications and smart contracts. It has a strong focus on sustainability and interoperability, making it an attractive option for users in Sana'a.

6. Binance Coin (BNB): Binance Coin is the native cryptocurrency of the Binance exchange, one of the largest cryptocurrency exchanges in the world. It can be used to pay for trading fees on the platform and participate in token sales, making it a popular choice among traders in Sana'a.

7. Polkadot (DOT): Polkadot is a multi-chain blockchain platform that enables different blockchains to transfer messages and value in a trust-free fashion. It aims to provide a more scalable and interoperable infrastructure for the decentralized web, making it a promising choice for users in Sana'a.

Overall, the top cryptocurrencies in Sana'a in 2024 are likely to be those with strong fundamentals, widespread adoption, and practical use cases for users in the city. Investors and users in Sana'a should conduct their own research and due diligence before investing in any cryptocurrency.