https://backpack.tf/profiles/76561198167149339#!/compare/1659398400/1659484800 - The Blast sold for 430 Keys

There weren't any usable sales for the Blast when you made this, but given it was last priced 9 months ago, it would've been better to leave this outdated. Relying on a 9 month old price for an item comprising the majority of the trade's value isn't a good idea.

That said, you can use 430 for the Blast's price now.