Sell courses to students abroad, paid into your own wallet.
Sardium adds a white-label checkout to your course site. The student pays by card or a local payment method through a licensed payment provider, the stablecoin lands in the student's own wallet, and the student sends the payment to yours. We never hold the funds.
Your students are in many countries. Getting paid by all of them is the hard part.
Students in many countries
Learners sign up from many countries. Collecting from all of them through one card account or one bank adds friction, and some never finish paying.
Disputes after the content is used
A course can be watched or downloaded and the card payment disputed afterwards. You lose the sale and still answer the dispute.
A platform between you and your revenue
Selling through a marketplace or payout platform puts its rules and its schedule between you and the money your students paid.
Three steps. The funds never rest with us.
The buyer pays by card
The checkout sits in your site, with your brand. The buyer pays by card or a local payment method through a licensed payment provider, which handles the card and the identity checks (KYC).
The stablecoin goes to the buyer's own wallet
The provider delivers USDC or USDT to a self-custody wallet that belongs to the buyer. Only the buyer holds its keys.
The buyer pays you
The buyer signs the payment from that wallet and sends it to your self-custody wallet. Sardium never holds or touches the funds; it runs the checkout and sends you signed webhooks.
What your school gets
Your school's brand at checkout
The checkout carries your colour and your name, so it reads as part of your course site.
Course fees in your own wallet
Payments arrive as USDC or USDT in a self-custody wallet you control, with no platform holding them for you.
Access opened on a signed webhook
A signed webhook tells your platform when a payment has arrived, so the course can open without anyone checking by hand.
A price per course
The checkout takes the amount and currency you pass, so each course or cohort can have its own price.
Questions, answered honestly.
Who holds the funds?
No one in the middle. The card payment is processed by a licensed payment provider, the stablecoin lands in the buyer's own self-custody wallet, and the buyer signs and sends the payment to your self-custody wallet. Sardium holds neither fiat nor crypto at any stage.
Does the buyer need a crypto wallet already?
No. The checkout gives the buyer a self-custody wallet of their own, and only the buyer holds its keys. The stablecoin arrives there first, and from there the buyer pays you.
Can every student pay by card?
Card payment runs through the licensed payment provider, which sets its own conditions for buyers, such as age, identity checks and purchase limits, and serves some countries and not others.
What if the buyer disputes the card payment?
The card purchase is between the buyer and the licensed payment provider, and a dispute about it is handled there, under the provider's rules. What reaches you is a stablecoin transfer the buyer signed from their own wallet. A card network cannot reverse a transfer on chain, so a refund to the buyer is one you decide on and send. Consumer law where you sell still applies to you.
Can I refund a student?
Yes. The payment sits in your own wallet, so a refund is a transfer you send back to the student, under your own refund policy.
Which stablecoins and networks can I receive?
USDC and USDT on Polygon, Base, Arbitrum and Optimism.
What do I need to start?
A registered business, a self-custody wallet address on a supported network, and business verification (KYB) with us. Fill in the application form and we will guide you through it. Some lines of business cannot be served; the application page lists them.
Bring a crypto checkout to your courses.
Fill in the application form; we will guide you through business verification (KYB).
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