Few suggestions:

1. I did a quick check and noticed the exchange button appear only for exchanges that are available in changelly, so it would be nice to have this feature for other combinations that are available across other exchanges as well. Also changelly hasn't been that good lately (a lot of complaints and scam accusations against them). I know your trying to use it as a way to earn through their referral link (that is in the exchange now button) but it would be best to look for alternatives.

2. Whenever there's a possible available change (on changelly) that the "Exchange now" button appears, upon clicking it, the second altcoin on changelly (right one) turns to ... (dots) instead of the actual numbers that has been chosen from your site (in case it's something from your side) and users have to delete the numbers from the left altcoin and type it again, so it would appear normally.

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I really like how you made the bottom half of the website (in order to see the places that each coin is available, although some appear to be without any).