ETS and Pearson employ raters and scorers to evaluate their tests online. Both companies will train you, and compensation is listed as $13-$19 an hour.
Requirements:

• A bachelor’s degree or higher
• Teaching experience
• U. S. citizenship, resident alien status or authorized to work in the U.S.
• U.S. residency
• Windows-based personal computer: Vista, XP, 2000, 98

Ets.org
Pearson Testing