tipster

n. one who provides tips, one who offers helpful information

The term tipster refers to someone who on a regular basis provides information on likely winners in sporting events. In the past tips were bartered for and traded but in modern times, thanks largely to the Internet and premium rate telephone lines, it's increasingly likely that a tip will be sold.Tipsters are often insiders of a particular sport able to provide bettors with information not publicly available. There are other tipsters who provide equally respectable results through analysis of commonly accessible information. Tipsters monitor their results to determine their overall yield and for such practices sites like Bettingexpert, FCBET and similar sites are used. The tipsters gather information of their yield, number of picks and total profit.
See more at Wikipedia.org...

Noun
1. one who sells advice about gambling or speculation (especially at the racetrack)
(synonym) tout
(hypernym) adviser, advisor, consultant
(hyponym) racetrack tout

     spitter

Synonyms and related words:
adventurer, adviser, announcer, annunciator, authority, betrayer, betting ring, bettor, boneshaker, canary, cardshark, cardsharp, cardsharper, channel, communicant, communicator, compulsive gambler, crap shooter, dopester, enlightener, expert witness, fink, gambler, gamester, gossipmonger, grapevine, hazarder, informant, information center, information medium, informer, interviewee, monitor, mouthpiece, nark, newsmonger, notifier, petty gambler, piker, player, plunger, press, public relations officer, publisher, punter, radio, reporter, sharp, sharper, sharpie, snitch, source, speculator, spokesman, sport, sporting man, sportsman, squealer, stool pigeon, talebearer, tattler, television, teller, tinhorn, tout, touter, venturer, wagerer, witness