The Greylock Federal Credit Union is a business credit card from Greylock Federal Credit Union. The annual fee is No annual fee.. The ongoing APR is Current rates vary between 10.75% - 18.00%. after a 0% APR for 12 months introductory rate for 12 months. Signup bonus: 10,000 bonus points after spending $500 within 90 days of account opening.. Rewards: 1 reward point for every dollar charged; points redeemable for valuable gifts, travel, and cash rewards. Typical credit limit: Credit lines up to $25,000. This product does not report routine activity to your personal credit (only on default if a personal guarantee is required).