Monthly minimum
On a statement: MONTHLY MINIMUM ADJ.
A floor on the processor's fees: if your markup for the month comes in under (say) $25, they charge the difference. Irrelevant in a busy month, painful in a slow winter or if you keep a second account you barely use. Read the fine print — some minimums count only the processor's markup, so you can be charged one even in a month with sales.
What a fair version looks like
$0–$25 a month, and it should be waived once your volume is established.
What 321 Swipe would do
We negotiate it out, and close 'backup' accounts that exist only to generate minimums.
See it on a statement
On our sample statement this line is $0.00 (Minimum met).
Related fees
Is this on your statement?
Send it and we'll tell you — along with everything else on there that shouldn't be. A phone photo of the fee page is enough.