KAST is far cheaper to get: the first two virtual cards are free and the physical card costs nothing beyond 40 USD shipping, against RedotPay’s 10 USD and 100 USD. It also publishes a cashback rate — 1.5% at the free Standard tier — where RedotPay publishes none. The catch is certainty. KAST’s foreign transaction fee is a range, 0.5–1.75%, which the issuer says depends on where you live and where you spend, and the ranges overlap with RedotPay’s flat 1.2%. We do not claim one is cheaper.
In 30 seconds
Cost to get the cardKAST — 2 free virtual cards, physical is shipping only
Foreign transaction feeRanges overlap — 0.5–1.75% against a flat 1.2%
Predictable rateRedotPay — 1.2% regardless of tier or location
Cashback publishedKAST — 1.5% base, up to 3%; RedotPay publishes none
FundingKAST is 0% for stablecoins but 2–5% for anything else
Published eligibilityRedotPay lists who it excludes; KAST publishes no country list at all
Full comparison
Read straight from the same database as each card’s review.
We mark a winner only when one card’s worst case still beats the other’s best case —
where the ranges overlap we say so instead of picking for you.
Where you can apply
Item
KAST
RedotPay
Taiwan
Available — we applied ourselves
Available — we applied ourselves
Hong Kong
Available — we applied ourselves
Not on the issuer’s exclusion list
The card
Item
KAST
RedotPay
Network
Visa
Visa
Card type
Debit
Prepaid
Physical card
No — virtual only
Yes
Fees
Item
KAST
RedotPay
Annual feeRanges overlap — depends on tier or where you spend
betterFirst 2 free, then 2 USD each; in some countries the first card already costs 2 USD
10 USD
Physical card issuance
betterCard free, 40 USD shipping
100 USD
Foreign transaction feeRanges overlap — depends on tier or where you spend
0.5%–1.75% (by residence and merchant country)
1.20%
Top-up / deposit feeRanges overlap — depends on tier or where you spend
Stablecoin 0%; other tokens auto-converted 2–5%; ACH 2 USD; FedWire/SWIFT 15 USD; SEPA 0.5%
Free
Crypto conversion
Stablecoin to USD 1:1, 0% spread
1.00%
ATM withdrawal
3 USD + 2% of the amount (non-USD adds the 0.5%-1.75% FX fee on top)
2% up to 10,000 USD withdrawn per month; 3% above
Cashback
Item
KAST
RedotPay
Base cashback
1.5%
Not published
Maximum cashback
3% — requires: Private tier, which costs 10,000 USD a year
Not published
Cashback cap
2,000 USD/month — Standard: first 2,000 USD each month
Not published
Hands-on in Taiwan
Item
KAST
RedotPay
Apple Pay
We have not tested this
We have not tested this
Google Pay
We have not tested this
We have not tested this
LINE Pay
We have not tested this
We have not tested this
7-11
We have not tested this
We have not tested this
FamilyMart
We have not tested this
We have not tested this
Verification
Item
KAST
RedotPay
Last checked
2026-08-05
2026-08-04
“Not published” and “we have not tested this” are different things, and neither means zero.
We do not fill gaps to make the table look complete.
KAST Card suits you if
You want the lowest entry cost, especially if you want a physical card
You will fund with stablecoins, where KAST charges nothing
You want a stated cashback rate you can calculate against
RedotPay Card suits you if
You want to know your fee before you apply rather than after
You fund from mixed assets and do not want to be hit with a 2–5% conversion
You want to check your country against a published list first
So which one?
KAST is the cheaper card to acquire and the only one of the two that publishes what it pays back — but two things are unresolved. Its foreign transaction fee is a range the issuer ties to your location, and it publishes no list of supported countries at all: the official guidance is to see whether your country appears in the verification dropdown. RedotPay costs more up front and pays nothing back that it will state, but you can check both the fee and the eligibility before spending anything. Which unknown you would rather carry is the real question here.
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KAST Card 
RedotPay Card