Spend crypto without selling

Unlike other crypto cards or finance apps, you don’t need to sell your crypto to use its value when spending with Quartz. Your spending is paid for with DeFi loans, using your crypto as collateral. If your crypto’s value increases, you keep all your gains. If your crypto’s value drops to the amount required to cover your DeFi loans, it’s automatically sold at market rate so you don’t get liquidated (meaning you don’t lose out on any value).

Your funds on Quartz are always kept on-chain and in your custody, meaning no matter what happens to Quartz, your funds stay secure. We aggregate DeFi protocols so you always get the best rates without any complexity. Quartz lets you interact with the traditional finance world while staying truly crypto-native.

Instead of selling your crypto to cover an expense, Quartz covers the expense with a DeFi loan, using the funds in your account as collateral. Here's a concrete example of how this works:

• You add $50 worth of SOL to your Quartz account

• You tap your Quartz card to pay for a $15 lunch

• The Quartz smart contract takes out a $15 USDC loan, using your SOL as collateral

• The smart contract then sends the $15 USDC loan to Visa to cover your $15 card purchase

• Your SOL collateral earns yield, which offsets the interest on the loan

• If your SOL collateral drops to $20 in value,  $15 is automatically sold by the Quartz smart contract to avoid liquidation

• If your SOL collateral rises to $100 in value, you keep the $50 gained

Before tapping your phone to pay, you open the Quartz app and select the amount of funds you want to pre-authorize for spending. This gives Quartz access to withdraw those funds should you use your crypto card. If you don’t use your card, or you cancel the authorization, Quartz loses access again. No one else can ever access your funds.

By requiring pre-authorization, Quartz is unable to touch your crypto until you specifically authorize a transaction. This gives Quartz the ability to withdraw that amount and that amount only, so you can be sure your funds stay secure and in your custody no matter what happens.

Pre-authorization also provides stronger protection from fraud, as your virtual crypto card cannot be debited without your permission, even if your card details are stolen.

Pre-authorization is the default, but if you don’t want to authorize each card transaction, you can give Quartz permission to withdraw from your balance whenever a card transaction comes in, without needing your in-app approval. No matter which option you choose, your funds always stay on-chain and you can withdraw at any time.

Your Quartz virtual debit card can be used for both in-person and online transactions. For online card transactions that support 3D Secure, no pre-authorization is needed as confirming the transaction sends the funds to Quartz. For other online card transactions, spending requires the same authorization as
in-person transactions.

Your Quartz account is an on-chain program, controlled by your on-device biometrics and your recovery wallet. This recovery wallet can be an external wallet (such as Phantom or Solflare), your email, social media account, or a newly generated seed phrase. With the Quartz app you can send and accept crypto, send and accept fiat, convert cryptocurrencies, and spend with a crypto card.

You can buy cryptocurrency with Apple Pay / Google Pay, or by simply sending a bank transfer to your Quartz account. The fiat (euros, dollars, etc.) will automatically be converted into your desired crypto token. You can also sell crypto by spending with your crypto card, or by sending a bank transfer to a fiat bank.

• 1% card spend fee

• 0.25% bank transfer fee + bank transfer network costs ($0.50 for ACH, $1 for SEPA, $20 for WIRE/SWIFT)

• 25% cut of yield generation (the yield rate shown above is how much you earn after considering fees

No hidden or opaque charges. Ever.

Yes! We won 5th place in Payments for the Colosseum Radar hackathon, and 3rd place in Mercuryo’s Best Consumer Use Cases hackathon.

Our private beta is available to select members of our early-access Discord community, with more places available as we update the product. There are a limited number of spots, so join the waitlist to secure yours!

If you'd like to learn more about Quartz, check out our docs.

If you can't find what you're looking for there, we’re always happy to answer any questions you may have! You can reach out to us on X, join our Discord community, or send an email to diego@quartzpay.io.