We have discussed Writer Beware and Predators & Editors. Both are invaluable websites when you’re trying to decide who to query. Another great resource for checking the credibility of an agency is The Association of Authors’ Representatives(AAR). AAR is a nonprofit organization dedicated to setting a standard for agents. In order for agents to gain an AAR membership, they must met certain requirements and agree to the a code of ethics. It’s kind of like a Better Business Bureau for literary agents.
Remember, not all reputable literary agents belong to this organization, and the ones who do aren’t monitored at all times. Make sure to use all resources available to make sure you’re not being scammed.