Cadmos reviewed: what a self-custody crypto card does well, and where it stays silent
Available in US
Cadmos pitches itself at a particular kind of crypto user: someone who already keeps their own coins in their own wallet, and wants a card that taps that wallet at the point of sale rather than depositing funds with a custodian first. The Premium tier is a Visa Signature with lounge access and a 24/7 concierge, the Standard tier is a simpler Visa or Mastercard, and both spend fiat that has been settled from USDC or USDT held in a self-custody wallet. That structure sets it apart from most cards in the category, where the card brand holds the crypto on the user’s behalf.
The trade-off is information. Cadmos publishes very few of the numbers a reader usually wants to compare: a list of supported countries, the cost of issuing a card, the spread on converting crypto to fiat at the till, the ATM terms, and the name of the licensed institution that actually issues the programme. What is on the site lines up with what the product does; what is not on the site is a real limit on how confidently you can rely on it, and I have called those gaps out as I went through the review.
Conditions are current as of October 28, 2026.
Verdict: 7.0 / 10
Cadmos is a credible option if you already manage your own keys, hold USDC or USDT, and want a card that draws on that balance without the funds ever leaving your wallet until the moment of payment. The Premium tier carries meaningful travel benefits for the headline price of $0 a month, and the top-up side accepts stablecoins on three networks. Outside that profile, the card is harder to recommend: there is no public list of supported countries, the cost details for the Standard tier live on the order screen, the issuer is not named, and the fee for converting crypto to fiat is not published.
| Criterion | Mark | Reason |
|---|---|---|
| Who can get it | 7 / 10 | Cadmos does not publish a country list; terms rule out US-embargoed destinations and otherwise leave eligibility to the app’s checks. |
| Cost | 7 / 10 | Premium is $0 a month with a 1.75% FX fee, but issuance and the crypto-to-fiat conversion fee are not stated; Standard prices are only on the order screen. |
| Top-up options | 9 / 10 | USDC and USDT, sent from your own wallet on Arbitrum, Solana or Tron — a clear and focused set of options. |
| Reliability and complaints | 6 / 10 | The company has been in Limassol since 2021; the card issuer and its licence are not named, no public complaints surfaced, and the wallet is non-custodial. |
| Everyday use | 6 / 10 | Premium adds Apple Pay and Google Pay; Standard lists only Apple Pay; virtual/physical form and ATM terms are not stated. |
| Total | 7.0 / 10 | A self-custody-first card that suits a narrow audience well and leaves too many details to discovery for everyone else. |
If your stablecoins sit in a wallet you control, you travel often enough to value lounge access, and you are comfortable verifying your eligibility inside the app, Cadmos Premium is worth a serious look. If you want a card from a household-name issuer with a published fee table, a printed country list and named chargeback rights, you will probably be happier elsewhere.
Who can get the Cadmos card
Cadmos does not publish a list of supported countries. The site states that availability depends on eligibility and on the options shown inside the app, which means the only way to know whether you can get a card is to start the order flow. Terms require that you are not in a US-embargoed country, but that is the only country carve-out stated publicly; other restrictions are handled by the app’s checks.
There is no public residency-versus-citizenship breakdown. The terms do not say whether the rules apply to where you live, where you are a citizen, or both, and they do not name a minimum age. In practice, the KYC step is the gate: when you order, the app tells you what to upload, and you find out then whether you are eligible.
For a self-custody user in a country that is not under US embargo, the realistic expectation is that the app will tell you. For everyone else, the answer is “try it and see,” which is not as informative as a printed country table.
How to sign up
Signing up means installing the app, creating an account, and ordering a card. The KYC step varies by product and is shown on the order screen rather than in the terms, so what you actually upload depends on the tier you pick. The pieces the app may ask for include a government ID, personal information, and a proof-of-liveness check (a selfie or short video, the kind banks use to confirm a real person is present). Proof of address and a stated minimum age are not spelled out in the public material I read.
The card you order depends on the tier. Premium is a Visa Signature. Standard is either a Visa or a Mastercard, and the app tells you which scheme is available in your region. The form factor — whether the card arrives as virtual, plastic or both — and the currency the card settles in are not stated, which is unusual for a published card programme. Delivery time is not stated either.
You will not see “issued by” anywhere on the public pages, and the terms do not name the institution behind the programme. For a regulated product that is a meaningful gap, and I will come back to it under risks.
What the card really costs
Cadmos splits its pricing into two distinct shapes. Premium is the more transparent of the two: $0 a month in fees, a 1.75% foreign-exchange fee, and a monthly spend limit of $175,000. Standard does not publish prices; the fees are shown on the order screen. That makes Standard hard to compare on paper, and Premium easy to compare except where the figures Cadmos does not give you (the cost of issuing the card, the fee for converting crypto to fiat at the till) are the ones that matter most.
| Item | Premium | Standard |
|---|---|---|
| Monthly fee | $0 | Not stated (shown on order screen) |
| Card issuance | Not stated | Not stated (shown on order screen) |
| FX fee | 1.75% | Cross-border/FX fees per its programme terms; figures not published |
| Crypto-to-fiat conversion fee | Not stated | Not stated |
| ATM | Not stated | Not stated |
| Monthly spend limit | $175,000 | No Cadmos-set wallet or transfer cap; card limits set by the programme and shown in the app |
Three everyday payments, walked through:
- Coffee in your home currency, paid with Apple Pay from a balance topped up with USDC on Arbitrum. The conversion from USDC to your local currency runs at the card programme’s rate. Cadmos does not publish the spread, and there is no stated FX fee because the transaction is domestic. The network fee you paid on Arbitrum to send the USDC sits on the blockchain side, not the card side.
- Dinner in a country that uses a different currency, paid by tapping the physical card. The 1.75% FX fee applies on Premium. Standard falls back to the cross-border/FX terms of its programme, which Cadmos does not list. In both cases, the crypto-to-fiat conversion at the top-up moment has its own cost, which is also not published.
- ATM withdrawal abroad. Cadmos does not publish ATM terms for either tier, so I cannot tell you what you would pay. Treat that as a question to ask the app before you travel, not as a free pass.
The honest summary is that Premium gives you a clear monthly fee and a clear FX fee, and leaves issuance and the conversion fee implicit. Standard gives you less to look at, because pricing is meant to appear in the order flow rather than on the website.
Top up the card
Cadmos is built around a self-custody wallet. You hold your own USDC and USDT, and you transfer them to the card when you want to spend. The wallet balance stays under your control until a card top-up is approved, which means the moment between “coins in your wallet” and “fiat on the card” is the moment Cadmos becomes involved at all.
The networks Cadmos lists for top-up are Arbitrum, Solana and Tron. That is a deliberately short list, which has practical consequences. Arbitrum is an Ethereum layer-2 with low gas and broad stablecoin support, Solana is fast and cheap, and Tron carries a lot of USDT traffic. None of these networks charges the card provider a fee, but each one charges the user a network fee for the transfer itself — and Cadmos does not state a minimum top-up or a top-up fee on its side, so the only number you can be sure of is the blockchain’s.
A few things to keep in mind before you send anything:
- The transfer is irreversible once the blockchain confirms it. Sending USDC on a network Cadmos does not support, or to an address that belongs to a different network, can mean lost funds or a manual recovery with no guarantee.
- Tron is a stablecoin rail where USDT has historically been dominant, but it is not the same as ERC-20 USDC on Ethereum. Make sure the wallet you send from matches the network Cadmos expects.
- There is no bank top-up route. The model is wallet to card, not bank account to card.
The wallet-closure path is email-based. Closing the card does not freeze or move the digital assets that sit in your wallet, because Cadmos never held them. Whether you can withdraw any residual fiat balance on the card itself is not stated, and that is worth confirming before you request closure.
Paying with it every day
Premium supports Apple Pay and Google Pay. Standard supports Apple Pay for both Visa and Mastercard versions, and Google Pay is not mentioned. Both tiers work as contactless or online cards once they are loaded, and Premium adds Visa Signature benefits: access to more than 1,300 lounges in over 500 cities, 24/7 concierge support and the Visa Airport Companion app. Standard lists no benefits. There is no published list of blocked merchant categories, so I cannot tell you whether gambling or other restricted categories are declined by default.
The app is the operational centre. It is the place you go to top up, to view the balance, to reach support and to find the help centre. Ratings for the app on the stores were not read, and the disputes process is not described on the public pages. The terms do state that any dispute is governed by French law and the Paris courts, and that the parties must try to resolve in good faith within 30 days of a written notice. Whether the standard card-issuer chargeback process applies on top of that is not stated.
A few things to know about how the card behaves at the till:
- Tokenised mobile wallets like Apple Pay replace the card number with a device-specific number, and the card issuer can restrict that token — for example, blocking it for online use. That is a general feature of tokenisation, not something specific to Cadmos, but it can be the reason a tokenised card works in a shop and not on a website.
- A declined authorisation can leave a hold on funds for several days, and on a card that draws on a real-time balance, that hold is the difference between “the balance is gone” and “the balance is locked until the hold clears.”
- 3-D Secure is the protocol that asks for a one-time code or biometric at checkout; Cadmos does not specify how often it triggers this verification or which cardholders see it.
What can go wrong
The risk picture for Cadmos is mixed. The parts that are clearly stated are reassuring; the parts that are not stated are exactly the parts a careful reader is going to want to know.
The company behind Cadmos is Cadmos LTD, registered in Limassol, Cyprus, with company number HE 457316, founded in 2021. That is a verifiable fact. What is not verifiable from the public pages is the name of the card issuer and the licence under which the programme operates. Crypto cards in Europe typically sit on top of an electronic money institution licence, and a few sit on a credit institution licence, but Cadmos’s terms do not name either. For a product that handles KYC, sanctions screening and fiat settlement, that is a meaningful omission.
The self-custody side is well-handled. The terms state that Cadmos does not receive, hold, safeguard or acquire title to your digital assets or fiat funds, and that you, the user, hold the recovery phrase. That is a real protection against counterparty risk on the crypto side: if Cadmos as a company ran into trouble, your coins in your wallet would not be part of the estate in the way coins held on an exchange would be. It also puts the responsibility for key management, phishing and clipboard-hijacking malware squarely on you.
Support is available at [email protected], through tickets inside the app’s Help Center, and by phone at +1 (845) 588-8434. Premium customers also get 24/7 concierge by email and WhatsApp. I found no Trustpilot or Reddit reviews of “Cadmos Pay” in my search, which is consistent with a small user base, but it also means there is no public pattern of complaints to look at.
Three categories of risk to keep in mind:
- Issuer risk. The card programme depends on a licensed issuer that Cadmos does not name. Card programmes can be suspended by networks, as happened with FTX in November 2022 and with WaveCrest in 2018. The non-custodial wallet does not protect you against a programme closure, because your card would stop working; it only protects you against loss of the underlying crypto.
- Stablecoin risk. USDC and USDT are designed to hold a steady value against the US dollar, but the design has been tested. USDC briefly lost its peg in March 2023 during the US banking crisis, and the broader stablecoin category has seen outright collapses. Cadmos’s card is only as predictable as the stablecoins you top it up with.
- Operational risk. Closed programmes typically follow a pattern: a notice period, then loading stops, then spending stops, then a window to withdraw any remaining balance. The “how to withdraw money” path for Cadmos is not documented in detail, so you should not assume there is a long, generous wind-down.
What to take instead
Cadmos is one option among several self-custody-oriented cards. If the gaps above matter to you, the cards below are worth comparing. They are not identical products, and the differences are in the details.
| Card | Score | Country model | Top-up | Headline fees |
|---|---|---|---|---|
| TokenPocket (TP Card) | 5.8 / 10 | Visa debit for a published list of European countries/territories; Mastercard debit for a published list including Australia, Canada, Hong Kong, Japan, Singapore, the UK and others; Americas “planned for Q2 2025.” | Crypto from the TokenPocket wallet on Arbitrum. | “Apart from these, TP Card does not charge any additional fees”; 1% fee on crypto deposits into the card, refundable through rewards. |
| MetaMask Card | 7.1 / 10 | Sign-up open in 45 listed countries/territories (e.g. Andorra, Argentina, Brazil, Canada, Mexico, Germany, France, Spain, Uruguay); other regions join a waitlist. Proof of residency required; US/UK sign-ups temporarily closed per FAQ. | Spends directly from the connected wallet on Linea, Base, Monad, Solana; tokens include mUSD, wETH, EURe, GBPe, USDC, USDT. | Virtual free; Metal $199/year; “minimal fee per transaction” (amount in fee table); no foreign transaction fee, Mastercard rate used. |
| KAST | 6.1 / 10 | Residence-based, decided at KYC; country list not published; restricted-locations list referenced without named countries; citizenship/ID rules also matter. | Stablecoins USDT, USDC, PYUSD, RLUSD on Ethereum, Solana, Polygon, Arbitrum, Tron. | Standard $0/year, Premium $1,000/year, Private $10,000/year; non-USD FX 0.5%–1.75% depending on residence, transaction country and programme; 0% on stablecoin top-up, card spend in USD, and Apple/Google Pay. |
A few notes by way of comparison:
- If a published country list matters to you, MetaMask Card is the most explicit of the three, with named countries and a waitlist for the rest. TokenPocket also publishes lists. Cadmos does not.
- If the issuer’s name matters, MetaMask Card names Monovate as issuer and Crypto Life as card provider. Cadmos does not name an issuer.
- If you want cashback in dollars, KAST publishes a tiered cashback structure (Standard 1.5% on the first $2,000/month, Premium 2% on the first $10,000/month, Private 3% on the first $40,000/month). MetaMask Card offers mUSD cashback (Virtual 1%, Metal headline 3% with a footnote capping 3% at the first $10,000 spent then 1%) and a Blackbird dining bonus. Cadmos publishes no cashback.
- If you want a free tier with no annual fee, Cadmos Premium ($0/month) and KAST Standard ($0/year) are at parity. MetaMask’s free tier is the Virtual card.
Who I would recommend it to
Cadmos is the right card for a specific kind of reader, and the wrong card for most others.
It is a good fit if you already self-custody USDC or USDT, you are comfortable on Arbitrum, Solana or Tron, you want your coins to stay in your wallet until the moment you spend, and you travel enough to make the Premium tier’s lounge access and concierge worth having. The $0 monthly fee and the 1.75% FX fee are easy to compare, and the self-custody model means the card is not the place where your counterparty risk sits.
It is not a good fit if you want a card from a named, regulated issuer with a published fee table; if you need a printed list of supported countries before you sign up; if you plan to use an ATM heavily; if you want cashback; or if you would rather not be the only person responsible for your recovery phrase.
In short, Cadmos is a specialised tool that does one thing — turning a self-custody stablecoin balance into a Visa payment — and does it cheaply, with very few of the surrounding details explained. If that is what you want, it is worth your time. If you want the standard card-issuer experience, look at one of the alternatives above.
Frequently asked questions
What is the Cadmos card?
The Cadmos card is a payment card that spends a fiat balance settled from USDC or USDT held in your own self-custody wallet. There is a Premium tier (Visa Signature) with lounge access and a 24/7 concierge, and a Standard tier (Visa or Mastercard) without published benefits. Your coins stay in your wallet until a top-up is approved.
How does the Cadmos card work?
You install the app, complete the KYC checks the order screen asks for, and order a card. To spend, you top up the card by sending USDC or USDT from your own wallet over Arbitrum, Solana or Tron; Cadmos settles that as fiat and the merchant is paid in fiat. The card can then be used at point of sale or online, and Premium adds Apple Pay and Google Pay.
Is Cadmos a bank?
No. Cadmos LTD is a company registered in Limassol, Cyprus, founded in 2021. The public pages do not name the card issuer or the licence under which the programme operates, so it is not a bank, and it does not present itself as one. The card sits on top of a separate licensed issuer, which Cadmos does not identify by name.
Who owns Cadmos?
Cadmos LTD is the company behind the product, registered in Cyprus with company number HE 457316. The terms do not name the card issuer or any other entity involved in the programme. The Cadmos app and the card brand belong to Cadmos LTD.
Is the Cadmos card available in my country?
The site does not publish a list of supported countries. Terms rule out US-embargoed destinations; other eligibility is decided by the app when you try to order. If you can complete the KYC step on the order screen, you are eligible for that tier in your region.
How do I get the Cadmos card?
Install the Cadmos app, create an account, and start the order flow. The KYC step will show you what to upload, which can include a government ID, personal information and a proof-of-liveness check. Once KYC clears, you order the card through the app.
Does the Cadmos card require KYC?
Yes. The exact requirements differ by card product and are shown on the order screen. The terms require that users are not in a US-embargoed country, and the KYC step is where individual eligibility is decided. Proof of address and a minimum age are not stated in the public material.
How do I top up the Cadmos card?
Send USDC or USDT from your own wallet to the address shown in the app, on Arbitrum, Solana or Tron. The balance stays in your wallet until a top-up is approved, at which point Cadmos settles it as fiat. Network fees apply on the blockchain side; Cadmos does not state a minimum or a top-up fee on its side.
Is the Cadmos card safe?
The self-custody model means Cadmos does not hold your coins: the terms state that Cadmos does not receive, hold, safeguard or acquire title to your digital assets, and you hold the recovery phrase. The card programme itself depends on a licensed issuer that Cadmos does not name, and the public pages do not describe a chargeback process. Treat the issuer question as a real gap.
How do I close my Cadmos account?
Closure is requested by email, and closing the card does not freeze or move the digital assets in your wallet, because Cadmos never held them. Whether any remaining fiat balance on the card itself can be withdrawn, and on what terms, is not stated in the public material, so it is worth asking support before you start the closure.
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