The phrase "flat fee" refers to a set, fixed charge for a product or service. It means you pay the same amount regardless of how much or how little you use or need. Full definition
Any thoughts on how I might make the case for flat fees for these types of clients? (myshingle.com)
I charge clients a small flat fee of $ 150 to repair their credit. (credit-aid.com)
Rather than buying music outright, like we did in the era of CDs and digital downloads, people are increasingly paying flat fees for all - you - can - access tunes. (cnet.com)