Micropayments Are Here!
Latest version of mymuse (MyMuse Version 1.0.100819 build 129) updates the paypal plugin to include an option for using micropayments.
You need a separate account at PayPal that uses micropayments. The plugin can set the "cutoff" so orders
over the cutoff use the regular paypal account.
Policies at paypal regarding micropayments are in flux. As of this writing it only supported some transactions (such as US to US). From this post it looks like it will rolled out to multiple currencies soon: PayPal upcoming Policies