Here are the top 20 real exchanges in the cryptocurrency space, in no particular order:

1. _Binance_: The largest cryptocurrency exchange by trading volume. ¹

2. _Coinbase_: A popular exchange with a reputation for security and reliability.

3. _Kraken_: A secure exchange with advanced trading features.

4. _Huobi_: A popular exchange with a wide variety of cryptocurrencies.

5. _KuCoin_: A exchange with a wide variety of cryptocurrencies and low fees.

6. _Bittrex_: A secure exchange with a wide variety of cryptocurrencies.

7. _Bitfinex_: A advanced exchange with margin trading and lending.

8. _Gemini_: A New York-based exchange with a focus on security and compliance.

9. _eToro_: A social trading platform with a wide variety of cryptocurrencies.

10. _OKX_: A popular exchange with a wide variety of cryptocurrencies and a large user base. ¹

11. _Bitstamp_: A European exchange with a reputation for security and reliability.

12. _(link unavailable)_: A popular exchange with a wide variety of cryptocurrencies and a large user base. ²

13. _Lykke_: A Swiss exchange with a focus on security and reliability.

14. _Upbit_: A European exchange with a wide variety of cryptocurrencies. ¹

15. _ShapeShift_: A non-custodial exchange with a wide variety of cryptocurrencies.

16. _SFOX_: A high-performance exchange with advanced trading features.

17. _Deribit_: A specialized exchange for cryptocurrency options and futures.

18. _Bybit_: A popular exchange for cryptocurrency derivatives.

19. _FTX_: A popular exchange for cryptocurrency derivatives.

20. _Uphold_: A popular exchange with a wide variety of cryptocurrencies and a large user base. ²

Please note that the ranking of the exchanges may vary depending on the criteria used, and it's important to do your own research and due diligence before choosing an exchange to use.