Carbon38: Shopping portal cashback & miles rates
carbon38.com
Checked 59m ago · 10 portals compared
Every portal below pays you for starting your Carbon38 purchase there: they split the commission they get from Carbon38 with you. Same store, same checkout, same order, but cashback or miles on top. New here? How portals work
Best Carbon38 rate right now
Best points
Verdict:
2 rate changes in the 48 days we've tracked it. Last moved Jul 12, 2026. TopCashback has held the top cashback rate longest: 48 of 48 days.
True on most portals for Carbon38:
Cashback
Show all 8 cashback portals Show fewer
Category rates & exclusions
- Online Purchase · most items 10%
Exclusions: - Purchase or redemption of a Carbon38 gift card. - Use of a coupon code not displayed on TopCashback. Terms: - Cash Back is calculated only on the item(s) price and does not include taxes, shipping or other fees. - Cash Back earned cannot exceed the total purchase amount. - To be eligible for Cash Back on all products, you must begin your purchase with an empty shopping cart. - Should your Cash Back fail to track automatically, please submit a Missing Cash Back Claim within 100 days of your order.
Details last checked 5d ago.
What doesn't earn
Cash Back is not available on the purchases of gift cards. Use of coupon/promotional codes not listed on Rakuten may void Cash Back.
What doesn't earn
Cash Back does not apply to gift cards.
Show all 8 cashback portals
What doesn't earn
- Exclusions: Gift Cards - Not eligible for sign up bonus payout
Points
What doesn't earn
Cash Back is not available on the purchases of gift cards. Use of coupon/promotional codes not listed on Rakuten may void Cash Back.
Category rates & exclusions
- Online Purchase · most items 5.7 pts/$
Gift cards
Details last checked 59m ago.
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 →Carbon38's best cashback rate has changed 2 times since Jul 12, ranging 4% to 10%.
Each line follows the best rate on offer at that moment, whoever was paying it. Currently: Cashback via TopCashback, 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 Carbon38? +
Right now 10% on TopCashback leads, out of 10 portals we track for Carbon38. The full side-by-side comparison of cashback, miles, and points is above.
Is 10% a good cashback rate for Carbon38? +
10% on TopCashback is the usual rate for Carbon38.
Can I earn airline miles or points for Carbon38 through a shopping portal? +
Yes, the top is 6 pts/$ (Amex points) on Rakuten (Amex). Airline and card portals often pay miles or points instead of cashback.
How often do Carbon38's cashback rates change? +
Carbon38's best cashback rate has changed 2 times since Jul 12, ranging 4% to 10%.