Get paid by buyers abroad, in your own wallet.
Sardium adds a white-label checkout to your invoices and orders. The buyer pays by card or a local payment method through a licensed payment provider, the stablecoin lands in the buyer's own wallet, and the buyer sends the payment to yours. We never hold the funds.
Collecting from abroad is slow, costly and hard to follow.
Transfers through many hands
An international transfer can pass through several banks before it arrives, each with its own charges and checks, and you see little of it on the way.
Payments held for questions
A bank can hold a payment from abroad to ask about the goods, the buyer or the paperwork, and your shipment waits with it.
Buyers without an easy way to pay
A smaller buyer in another country may have no simple way to send an international bank transfer, so the order stalls at payment.
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 company gets
Your company's name at checkout
The checkout carries your colour and your name, so buyers pay on a page that reads as yours.
Payment in your own wallet
Payments arrive as USDC or USDT in a self-custody wallet you control. What you do with them next is your decision.
A payment page per invoice
The checkout takes the amount and currency you pass, so you can set up a payment page for an invoice and send the buyer its address.
A record on chain for each payment
Every transfer can be checked on chain and reaches your system through signed webhooks, which helps you match payments to invoices.
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.
Is this suitable for large invoices?
Card purchases are subject to limits set by the licensed payment provider, which depend on the buyer's country and verification. Sardium fits invoices within those limits. Tell us your typical invoice size when you apply, and we will tell you plainly whether it fits.
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.
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.
Who handles tax and trade paperwork?
You do, as with any other payment. Your accounting, tax and customs obligations stay with your business. Sardium is a software service and does not give tax or legal advice.
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 invoices.
Fill in the application form; we will guide you through business verification (KYB).
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