Deontay Wilder (39-0, 38 KOs) wants Anthony Joshua's management to stop "ducking" him and set up a fight for the WBC heavyweight championship.
The 32-year-old American, who is prepared to travel to Britain to defend his belt against WBA, IBO and IBF champion Joshua, has accused promoter Eddie Hearn of delaying negotiations over a bout.
Wilder told BBC Sport: "I think Eddie is ducking me more so than Joshua. If Joshua's a strong champion, a true champion, you guys in England should smoke him out, make him fight. You should see if he's the best. My heart says I'm the best, if I'm not I want someone to show me."
Joshua recently retained his belts by beating Carlos Takam in Cardiff and while Wilder would rather fight on home turf, he is willing to cross the Atlantic to face the Olympic gold medal winner.
"Packing out stadiums looks good but the money and Mecca of boxing is in America," Wilder added.
"But if you want to stay at home like a little girl, this king has no problem travelling to knock out the champion."
WBC President Mauricio Sulaiman urged: "Lets do it! Let's make it happen!! Deontay Wilder is waiting for his moment to shine. He made a statement with a tremendous one round KO of former champion Bermane Stiverne, who was trying to time the jab and counter. But then came that right hand, that would have knocked out any fighter in the World."
WBO heavyweight champion Joseph Parker has also taken aim at Joshua, stating the Brit and his team should be thinking of his legacy, not money.
The two are in negotiations over a potential fight in March with Parker stating there is a 50-50 chance of it happening.
Wilder polished off Bermane Stiverne in the first round to retain his WBC heavyweight title in Brooklyn and immediately set his sights on a huge showdown with Joshua, who defended his WBA, IBO and IBF belts against Carlos Takam last month.