We’ve made a very simple Ada address verification site here: https://adacheck.io
it’s definitely beta at this point, but it will take the input address and check if it’s valid Ada address or not. We’ll shortly add a bit more info about the valid address as well.
This was mostly a way for us to practice using the Cardano explorer api’s but I think it will also help people feel a bit more secure about where they are sending Ada.
Any feedback on it (positive or negative) is appreciated.
cool. balance doesn’t work right?
is it checking the blockchain for transactions with that address or just that the format of the address is correct?
Hi Hazel - balance and transaction history will be added today or tomorrow.
Also, the site is querying the blockchain for the address, not just that the format is valid.
Thanks for the feedback! We’ll continue to improve it with several updates this week.
But the best practice for privacy is never reuse address.
Balance is working now, though formatting will be improved…but it’s live and working right now: https://AdaCheck.io
(note - I scrubbed that address shown for privacy…).
Transaction list (latest 4 or so) coming up.
Hopefully these additional features will help further verify you are sending to not just a valid Ada account, but the one you intend (i.e. if you know your destination should have 0 Ada and it shows a balance, you better check things before sending 
