Jay Z -- Hosting Mayweather/Pacquiao Party ... $50k for V.I.P. Table

The competition for the hottest Mayweather/Pacquiao post-fight party is over ... cause Jay Z just announced he's getting in the game ... with V.I.P. tables running up to $50k-a-pop.

It's all going down at Marquee nightclub at the Cosmopolitan Hotel in Vegas -- just down the way from where Manny and Floyd will be facing off on May 2nd.

We spoke with party honchos who tell us they expect this to be the biggest after-party on the strip -- despite fierce competition from stars like Nicki Minaj, Chris Brown and 2 Chainz.

If you don't have $50k, don't worry ... there are cheaper options.

General admission tickets are $100 -- if you have a penis.

Tickets for females are significantly cheaper ... $30.

Gender equality -- it ain't for everybody.