Every comparison of these two cards I could find leads with cashback percentages. That is the least useful place to start, because the two products are not the same kind of thing underneath, and the difference decides what happens to your money in the situation where it matters.
Read both sets of terms and one sentence does more work than every fee table combined. KAST’s terms say this:
any remittance of Virtual Assets to KAST constitutes a transfer of ownership of such assets to KAST, in exchange for which KAST incurs a legally binding and enforceable payment obligation to you
You send stablecoins. KAST owns them. You hold a debt claim.
RedotPay’s terms do not say that. They also do not say the opposite. Which is its own kind of answer, and we will get to it.
The structural difference
KAST’s card is legally a credit card. Their terms state it plainly, the cardholder agreements carry an APR of 0% along with late-payment and returned-payment fees, and their help centre tells you to select “Credit” at checkout. It is a credit line secured by the balance you handed over.
RedotPay’s terms never categorise the card. They refer to a “Debit Account” and define your funds as held “in custody with the Custodian”. The word prepaid appears only inside a definition of the card network, not as a description of the product.
So one program tells you it bought your stablecoins and owes you money, and the other describes an arrangement where a custodian holds assets for you. Those are different legal positions with different outcomes in an insolvency, and neither program’s marketing page mentions it.
Who holds the money, and can you name them?
RedotPay names its custodian: Red Dot Trust Limited, a public company limited by shares incorporated in Hong Kong. The terms define it, and the definition allows for successor providers. You can look that entity up.
KAST’s terms define a “Custodian” and never name one. The assets are described as “held by a Custodian… on behalf of KAST (not for the users)”. That parenthetical is doing a lot of work.
KAST also includes a partner disclaimer stating that partners “do not have a contractual obligation or duty to keep the funds in the designated Account segregated from the Company other accounts” and “do not act as your trustee, an escrow agent or stakeholder”.
Read that twice. It is unusually direct.
The self-custody path
This is the split that surprised me most, and it runs the opposite way to what the fee tables suggest.
RedotPay’s terms define both a “Self-custody Wallet”, described as a wallet “in respect of which a user has control through holding the private key”, and a “Smart Contract Vault” inside that wallet. There is a route where you keep the key.
KAST’s current terms offer nothing equivalent. Their older US cardholder agreement does contain smart-contract language saying “the Collateral will be owned by you at all times and held in your custody within one or more smart contracts”, but that document is dated 2025-03-20 and directly contradicts the 2026 terms quoted at the top of this page. Two vendor documents, two incompatible descriptions of who owns your deposit. I would treat the newer one as governing and the older one as legacy, but I am reading tea leaves there and so is everyone else.
If self-custody matters to you, that is a real difference between the two, and it is not in any comparison table.
Who actually issues the card
Neither company is a bank. Both run on somebody else’s licence, which is normal and not a criticism.
KAST names its issuer: Third National, which is Nimbus LLC doing business as Third National. Its own site describes it as licensed as a Money Transmitter by the Commissioner of Financial Institutions of Puerto Rico, NMLS #2612780, licence #TM-0207, and as an issuer on the Visa network. A money transmitter, not a bank. That distinction matters because deposit insurance does not attach to money transmitters.
RedotPay’s terms refer to a “BIN Sponsor” which is “an actual issuer of the RedotPay Card”, but the terms page does not name the entity. You would need to find it elsewhere, and if you plan to hold a meaningful balance, that is worth doing before you fund rather than after something goes wrong.
What each one says about failing
KAST says this, in its own terms:
In case of failure, bankruptcy or liquidation by us, you won’t be protected by the Consumer Act in your local jurisdiction, thus, there is a risk you won’t recover your money or cryptocurrency paid to us.
Their help centre adds that reserve funds “are not insured, not risk-free”. No deposit insurance is claimed anywhere.
RedotPay’s terms page does not address segregation of customer assets or what happens on insolvency at all. I looked for it specifically.
Here is the uncomfortable part. KAST is more transparent about the bad outcome than RedotPay is. It tells you outright that you may not get your money back. Silence is not the same as protection, and a reader who rewards the quieter document is reading it backwards.
Fees, with a warning about the source
KAST’s published numbers, from their help centre and legal pages as of September 2026:
Membership runs $0 for Standard, $1,000 a year for Premium, and $10,000 a year for Private, billed twelve months upfront. Stablecoin deposits convert at 1:1 with no spread, which is genuinely good and better than most of this category. Non-stablecoin deposits carry a conversion fee their help centre describes as 2% to 7%. ATM is $3 flat plus 2%, capped at $250 a withdrawal and $750 per twenty-four hours. Cashback is 1.5% on the first $2,000 a month at Standard, rising to 3% on the first $40,000 at Private.
Now the warning. KAST’s own documents disagree with each other on three numbers I checked:
- FX markup. Help centre says 0.5% to 1.75%. The US cardholder agreement says up to 1.75%. The non-US agreement says up to 2% in its fee box and up to 3% in section 6.2 of the same document.
- Small transaction fee. Three vendor sources give $0.01, $0.10 and $0.20 for transactions under $25.
- Chargeback deadline. The help centre says 50 days, the terms say 90, the US agreement says 60.
When a program’s own documents contradict each other, the contract governs, not the help centre. But it also tells you something about how carefully the fee schedule is maintained, and it means any comparison table quoting a single KAST FX number is quoting one of at least three.
For RedotPay, the numbers we verified in July 2026 are 1.0% on top-up, 1.2% FX markup, and $100 for the physical card, funded with USDT, USDC, BTC or ETH on Visa, with no US support and full KYC where limits scale by verification tier. The full fee breakdown goes through the layers that never appear on a fee page, and the largest one is priced into the exchange rate rather than charged as a fee.
The cashback catch nobody mentions
KAST’s cashback is paid as USD “Cash Rewards” and, per the rewards programme terms, cannot be withdrawn to a bank account or external wallet. It applies to your next card purchase. There is a fourteen-day timelock, redemption is manual, it is forfeited if you close the account, and it is clawed back on refunds.
That is not a rebate. It is store credit with an expiry risk attached to your own account status.
Whether 3% in store credit beats a lower rate in withdrawable value depends entirely on how much you spend on the card, which is the calculation the $10,000 Private tier is asking you to make.
How I would read the two
I am not going to tell you which to use. The two questions that actually separate them are questions about your own situation, not about the products:
How much will sit on the card, and for how long? If the answer is small and briefly, the custody difference matters less than the fees, and you should compare the fee stacks. If the answer is meaningful or for a while, then “who owns this and what happens if they fail” is the whole question, and one program answers it explicitly while the other does not answer it at all.
Do you want a self-custody route? Only one of them defines one.
Everything else, the tier pricing and the cashback headline and the card metal, sits downstream of those two.
One last thing worth doing before either. Search whichever terms you are about to accept for the words “segregated”, “trust”, “safeguard” and “bankruptcy”. Fifteen minutes. It is the only part of this that is actually about your money, and it is the part every comparison article, including the ones ranking above this one, skips.
If you want the risk framing on its own rather than a comparison, is RedotPay safe breaks the question into the four parts that have separate answers.