Brainiac: Shopping portal cashback & miles rates
Checked 13h ago · 4 portals compared
Every portal below pays you for starting your Brainiac purchase there: they split the commission they get from Brainiac with you. Same store, same checkout, same order, but cashback or miles on top. New here? How portals work
Best Brainiac rate right now
Best points
Verdict:
1 rate change in the 54 days we've tracked it. Last moved Aug 6, 2026. Mr. Rebates has held the top cashback rate longest: 29 of 54 days.
True on most portals for Brainiac:
Cashback
Points
What doesn't earn
Using coupon codes that are not listed on Rakuten may void Cash Back. To be safe, stick to codes provided by Rakuten.
Joining a portal through a link here may earn us a referral bonus; it never changes these rates or their order. Details
How this tool is funded
Some links here are referral links: if you join a portal through one, that portal may pay us a referral bonus. It never changes the rates we show or how we rank them. How we make money
Best play
Stack the portal with the right card: the same purchase earns two ways.
Also fits: Bank of America Customized Cash Rewards (3% back on online retail) · Amex Blue Business Plus (2x Amex points on everything)
Card earn rates are our own notes, not live data. Issuer caps and terms apply, so double-check before counting on one.
Rate history last 21 days
Full history →Brainiac's best cashback rate has changed once since Jul 12, ranging 2.5% to 5%.
Each line follows the best rate on offer at that moment, whoever was paying it. Currently: Cashback via Mr. Rebates, Points via Rakuten (Amex). Same scale, different currencies: "3" means 3% cash, 3 pts/$, or 3 mi/$.
Every account sees the last 21 days here. Premium goes back to day one.
Recent changes last 21 days
Common questions
Which shopping portal pays the most at Brainiac? +
Right now 5% on Mr. Rebates leads, out of 4 portals we track for Brainiac. The full side-by-side comparison of cashback, miles, and points is above.
Is 5% a good cashback rate for Brainiac? +
5% on Mr. Rebates is the usual rate for Brainiac.
Can I earn airline miles or points for Brainiac through a shopping portal? +
Yes, the top is 2.5 pts/$ (Amex points) on Rakuten (Amex). Airline and card portals often pay miles or points instead of cashback.
How often do Brainiac's cashback rates change? +
Brainiac's best cashback rate has changed once since Jul 12, ranging 2.5% to 5%.