Got "tipping fatigue"? Here are some tips on how much to give for the holidays.

Seemingly ubiquitous requests for tips may be dampening Americans' generosity.

As of November, service-sector workers in non-restaurant leisure and hospitality jobs made an average of $1.28 an hour in tips, down 7% from the $1.38 an hour they made a year ago, according to Gusto, a payroll and benefits company. The decline comes as the advent of mobile payment technology spreads tipping, once generally reserved for places like restaurants and beauty salons, to many stores, gyms and even automated kiosks. 

Around the holidays, many service employees, including delivery people, building staff, cleaners and teachers, have come to rely on tips to tide them over what can be an expensive period. "Tipping fatigue," as some are calling the frustration with constant prompts, has also been aggravated by inflation and a slowdown in wage growth. 

"People are facing higher prices and are seeing their own paychecks slow, so they are tipping less in places where it wasn't previously expected," Luke Pardue, an economist at Gusto, told CBS MoneyWatch

Perhaps not surprisingly, consumers are more likely to tip people with whom they interact regularly.