The reward was announced Friday by a New York-based security consultant for television networks. Bill Stanton says the money is coming from anonymous sources. He refused to provide details or say who hired him.
Lisa Irwin's parents reported her missing Oct. 4. They say she disappeared from her crib overnight as her mother and two brothers slept.
Stanton says the logistics of how the reward would be distributed haven't been determined.
A spokesman for Kansas City's TIPS Hotline says it hasn't been contacted about the reward. The nonprofit hotline overseen by Kansas City authorities has been fielding hundreds of calls on the case.
Meanwhile, the family of the baby has posted home videos online showing her when she was about 3 months old.
Deborah Bradley and Jeremy Irwin said their daughter, Lisa Irwin, went missing early Oct. 4, when she was 10 months old. City and federal authorities have searched for the child, but say they have no suspects or major leads in the case. The baby is shown on four home videos posted on YouTube. In the minute-long segments, the baby makes happy sounds, eats and plays in a walker while her mother coos to her, calling her Pumpkin Pie. Family members say they posted the videos to help spread the baby's image. RELATED: Home video of Baby Lisa