Thursday Morning Riddle

I’m an errant foul ball that just glanced off the bat;
Pay the bill to your server, then add me to that;
I am Speaker O’Neill; I’m to greet with a hat;
And a stock or a horse you’re advised to look at.

Who am I?

UPDATE: Riddle solved by Micah. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. micah Says:

    Tip.

  2. Bill Says:

    TIP is correct. Way to go, Micah!

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