tipster
/ˈtɪpstər/Definitions
1. noun
A person who provides information or advice, especially about the outcome of a competition or event, in exchange for money or other reward.
“The tipster predicted the exact score of the game.”
2. verb
To provide information or advice, especially about the outcome of a competition or event, in exchange for money or other reward.
“He tipped the winner of the contest to the press.”