I'd personally say that the design is above average. It looks good and it's not eye-stressing. Kudos!

1. May I suggest since you already put the top 3 currencies in the navigation part you may as well make it clickable so I will not have to type it in the search bar since we are always looking for these three.

2. Another, though just trivial, not everyone knows the definition of 'database'. If a normal person reads it it may look intimidating to him/her. Try to use layman's terms as much as possible especially when you're already working on your blog.

The rest is good. Nice job and good luck!