The Financial Crimes Enforcement Network published the Money Services Business Guide to Money Laundering Prevention (pdf).
The manual starts with the definition of a “Money Service Business.”
Your business may be an MSB (Money Services Business) if…
The business offers one or more of the following services:
■ money orders
■ traveler’s checks
■ check cashing
■ currency dealing or exchange
■ stored value
■ Conducts more than $1,000 in money services business activity with the same person (in one
type of activity) on the same day.
■ Provides money transfer services in any amount.