What is the average up front payment for a project on Upwork that is considered reasonable and acceptable by both the freelancer and client?

[Btaliat]

It is a better thing for both the clients and the freelancers to agree on a particular upfront before starting a project. Freelancers should make sure that they don't collect less than 50% of the money. This will make it seem that the clients are truly ready for the tasks. When a client is not willing to pay up to that percentage, it can be inferred that they are not truly ready to have the tasks done.