Psi 0, 1, or 2 games - are credits from thin air or player's pool?
Yes, this card is an example of the Psi game mechanic, and credits are always spent from your credit pool. If aplayer has no credits, then they can only bid 0 during the Psi game (note: this is an excellent way of dealing with Caprice Nisei!).

From the manual (p.7),


  Credit Pool: Each player has a credit pool where he keeps the credit
  tokens he has available to spend. Spent credits are returned to the
  token bank.