Fat Cat Card: How to Split Spend Across Two Crypto Cards

Cashback caps punish people who put everything on one card. Splitting the bill is the free fix.

This post works the numbers for two cards with published, different cap shapes. You will see the split that earns the most, the month it stops being worth the hassle, and the one situation where splitting backfires. Fee tables for every card are on Fat Cat Card. Check it on Fat Cat Card

Educational content, not financial advice. Card terms change without notice. Figures come from each provider’s help pages as read on November 2, 2026, and cashback is paid in different forms, so the dollar totals below are not all cash.

What This Works Out

• What are the two cap shapes?
• What does each card earn on its own?
• What is the best split of the same spend?
• When does splitting stop paying?
• A Split-Spend Setup Routine

What are the two cap shapes?

Ether.fi Cash Core pays 3% on the first $2,000 of monthly card spend, 1% on the next $1,000 and 0.5% above $3,000, while Jupiter Card pays a flat 2% up to a $100 monthly cap, according to each provider’s help documentation read on November 2, 2026.

One card front-loads its reward. The other pays steadily and then stops.

When I checked ether.fi’s cashback article, I found that its rates apply progressively based on total spend in each calendar month, and that the reward is paid in ETHFI tokens that sit in a 7-day lock before you can claim them. Jupiter’s rewards page says its cap applies to your account as a whole, across all cards under the same Global ID, and that cashback lands in a Rewards balance after the transaction settles.

Because the two shapes cross, no single card wins at every spend level. We covered the single-card version in Crypto Card Cashback Caps 2026: Why a 3% Card Can Pay Less. This guide asks the next question: what if you use both?

What does each card earn on its own?

At $4,000 of monthly spend in US dollars, ether.fi Cash Core earns $75 in ETHFI and Jupiter Card earns $80, so the 3% card loses to the 2% card once spending passes about $3,667 a month.

Jupiter’s cap fills at exactly $5,000 of spend, since 2% of $5,000 is $100. Everything after that earns nothing on Jupiter.

What is the best split of the same spend?

For monthly US-dollar spending, the highest cashback comes from giving each card the dollars where its rate is highest: the first $2,000 to ether.fi Core at 3%, the next $5,000 to Jupiter at 2%, then the next $1,000 back to ether.fi at 1%.

Think of it as filling buckets from the best rate down.

1. Bucket 1: first $2,000 at 3% on ether.fi = $60.
2. Bucket 2: next $5,000 at 2% on Jupiter = $100, and the cap is now full.
3. Bucket 3: next $1,000 at 1% on ether.fi = $10.
4. Everything after: 0.5% on ether.fi, since Jupiter pays nothing past its cap.

Run $8,000 through it. That is $60 + $100 + $10 = $170, which is 2.1% overall. Putting all of it on ether.fi gives $95. I noticed that the gain is mostly Jupiter’s flat 2% catching the spend ether.fi would pay only 1% or 0.5% on.

The same trick works on any pair of cards. Find where each rate drops, then fill the top rates first.

When does splitting stop paying?

Splitting stops paying when the purchase is priced in a currency other than US dollars, because Jupiter’s documentation lists an FX conversion fee of 1.8% on non-USD payments for DCS-issued cards, which cancels most of its 2% cashback.

DCS issues Jupiter cards to residents of South Korea, Japan, Taiwan and several other countries, per Jupiter’s card page. On a won, yen or euro charge, 2% minus 1.8% leaves 0.2%, about $2 on $1,000. Rain-issued cards pay a 1% FX fee on the same charge, which leaves 1%.

Ether.fi’s FX page lists an added margin of 0.5% for Core members on top of the FX base rate, and notes that final rates depend on settlement timing. I found that its cashback tiers also treat EUR purchases differently from USD ones, so the table above is built for USD only.

Here is where people get tripped up. A split saves nothing if half your spend carries a hidden FX fee.

Other things that cut the gain:

• ETHFI is a token. Its price can fall during the 7-day lock before you claim it.
• Returns. Check each provider’s rules on whether a refunded purchase reverses its cashback.
• Time. Two cards means two apps and two statements to check each month.

Honestly, under about $4,000 a month the extra $20 or so rarely justifies a second card. Past $6,000 it starts to.

A Split-Spend Setup Routine

• Write down last month’s USD spending and non-USD spending separately.
• Route USD purchases through the two-card order above.
• Keep non-USD purchases on whichever card has the lower FX fee.
• Check on the 1st of each month. Both caps reset on the calendar month, so note which card is full.
• Redo the sums if either provider changes its rates. Both pages have an update date.

Quick Checks

Pay a big purchase on the card with room left in its bucket. Our guide to timing a big purchase around cashback caps shows what a $1,500 charge earns in a busy month versus a quiet one.

Check it on Fat Cat Card

FAQ

Does Jupiter’s $100 cap apply per card or per account?

Per account. Jupiter’s rewards page says the cap applies across all cards under the same Global ID, so a second Jupiter card does not raise it.

What happens to ether.fi cashback after I spend?

Cashback is converted to ETHFI at the current price once the purchase clears, then enters a 7-day lock before you can claim it, per ether.fi’s help center.

Can I raise Jupiter’s cap?

Jupiter says you can move to 4% with a $200 monthly cap for a month by referring at least two qualifying people in the previous calendar month. That path needs other people, so the table above ignores it.

Sources

• ether.fi Help Center: How does cashback work?
• ether.fi Help Center: FX rate on Cash transactions
• Jupiter Docs: Rewards & Referrals
• Jupiter Docs: Fees & Limits

Fact-checked against ether.fi and Jupiter documentation as of November 2, 2026. Not financial advice.