Note that this appears to be a $9.99 version of http://www.proofofexistence.com/, a free service. Also, this does not appear to be affiliated with the popular bitcoin exchange Bitstamp.
Bitstamped.io is not aimed at technical users - that's why payment is in USD and not BTC.
When deciding what to name your Bitcoin site, anything with the word "bit" or "coin" in it should be avoided. Please! Otherwise, you just join the list of other unmemorable bit/coin sites.
And, this goes without saying, pick something that, when you google it, google does not say "Showing results for Bitstamp".
"Showing results for Bitstamp" is irritating, but we only launched yesterday, hopefully Google will figure out that Bitstamped is a thing!
I'm with chuckup though, I tend to quickly forget all the sites with names like this (regarding bitcoin specifically). Thank goodness for bookmarks.