I am staying away from names of individual currencies (dollars, etc.) which would be limiting in the international arena.
The first few ideas all play on synonyms for money and speed/transport:
FlashCash
CashFlash
TransFund
TransCash
Secondly, foreign exchange trading, or FOREX, is becoming increasingly popular. This concept plays off of it for a feeling of instant familiarity:
MOREX
Third, look for an established expression that works great as a name for this company:
Cashflow
Finally, one concept is built as a pun on "currency" or money:
Current C
Current has the feeling of being there right now, "C" can stand for cash, and the whole thing, of course, sounds like currency...
Slogans
A good slogan should be about the product, and not merely a repetition of the name. Therefore, the following slogans may be paired with ANY of the above effectively.
The Money's There. Now.
The Money Moves.
Speed. Value. Security. Guaranteed.
Secure. Fast. Affordable.