Your cash, working up to 7%*

Earn competitive yield with no minimum required and same-hour liquidity

Open an account

Talk to an expert

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8% APY*

Net return

USD

6% APY*

Insured

Net return

USD

6% APY*

Net return

USD

4% APY*

Insured

Net return

USD

Two currencies.
Always earning.

Keep growing your cash until you need it with same-hour liquidity.

White euro currency symbol inside a purple circle on a gray and purple background.

Prime EUR

Up to

5%

Make your euros earn like the best treasuries do, without locking them away.

Standard: 5%

Insured: 4%

White euro currency symbol inside a purple circle on a gray and purple speckled background.

Prime USD

Up to

7%

Put idle dollars to work. Institutional yield on your USD, paid every single hour.

Standard: 7%

Insured: 6%

*APY reflects returns originating from borrower interest through decentralized protocols, not from Byzantine Finance. Byzantine Finance is a technology company, not a bank.

Customer stories

Founders and finance teams earn on their treasury with Byzantine

"For me, Byzantine is the best risk-adjusted return on the market today."

Nicolas Bacca, Founder of ZKNOX, Co-founder of Ledger

Discover the story ›

"We wanted security first, strong yield second, and complete visibility and access throughout."

Thibaut Gimenez, Co-founder, Super Capital

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"Byzantine gives a regulated French company a legitimate, audit-traceable path to earn 4-5% on idle treasury, in a single hour of setup."

Romain Lavernhe, Founder, T3tris Labs

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"Byzantine is the simplest solution we have found to generate genuinely attractive yield on our treasury, without locking it up."

Pierrick Vela, Co-founder, Skill Hunter

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See all customer stories →

Built on markets institutions already use.

$50B+

Liquidity across lending markets

$250B+

Stablecoins in circulation

$1T+

Loans originated to date

Built into every account

Your cash shouldn’t sit still.

Earn every hour.

Interest lands in your account automatically — no claiming, no waiting.

Circular timer display showing 59 hours, 8 minutes, and 10 seconds on a purple background.

Insured Capital

Optional insurance on your principal, via a global Insurer.

Outline of a shield with a checkmark inside, symbolizing security or protection.

Access anytime

Withdraw your capital whenever you want.

List of withdrawals with euro amounts: 3000.10, 12005.10, 8970.20, and a faded 46090.90.

Reporting, made simple

Reports + acounting tool integrations.

Buttons labeled Sync with three finance app logos, and Export reports in a purple oval button.

How it works

Start earning now

Open an account today and start growing your cash faster.

01

Open your account

Open an account or connect via API. We’ll support you every step of the way.

02

Fund it

Choose EUR or USD and fund your account in a few clicks.

03

Start earning

Earn returns every hour. Withdraw anytime.

Institutionnal standards

Designed for Institutional confidence

Built around the principles that underpin institutional confidence: transparency, robust controls and protection.

“Transparency is the thing insurers look at most.”

Rupert Poland · Digital asset leader, Aon

Security

Built to protect what you’ve built.

Bankruptcy-remote accounts, regulated partners, and insurance protection all built in.

Over-collateralised lending

Borrowers deposit more collateral than they borrow. Your principal is backed at all times.

Bankruptcy-remote architecture

Smart contracts handle all fund routing. Byzantine never holds your assets.

Insurance by Aon

Up to 100% of your principal plus returns insured against digital asset crime risk.

Audited partners

Keyrock, Portofino, Aon — independently auditable.

Regulated strategy

Curated by a MiCA-regulated partner.

Real-time monitoring

Continuous on-chain monitoring of all positions and risk parameters, 24/7.

Two ways to use Byzantine

Whether you manage a treasury or build financial products, pick the path that fits.

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Start earning now

Put your cash to work

Earn returns in EUR and USD, with insurance protection, hourly accrual and withdrawals anytime.

Up to 6-8% APY*

24/7 instant liquidity

Segregated accounts

Insurance on principal

EUR & USD

Daily return distribution

Diagram showing 4.68% APY with three user icons connected to a unicorn icon.

Talk to sales

Build returns into your product

Offer EUR and USD returns under your own brand. You own the client experience; we power the infrastructure.

Choose your currency, EUR or USD

Customisable strategy and risk profile

API, SDK, sandbox environment, and integrator dashboard

Stickier deposits and higher user retention

Live in 3 weeks

Ready to get started?

Join the institutions already earning yield with Byzantine.

Open an account

Schedule a demo

Investing in crypto-assets involves risks including total loss of capital. Past returns do not guarantee future results. Returns are variable and not guaranteed. Byzantine Finance SAS provides technical infrastructure; it is not a financial intermediary. Strategy curated by Keyrock Asset Management (AMF-regulated). Insurance covers technical risks only, not market losses.

Byzantine Finance SAS (”Byzantine Finance”) is a simplified joint-stock company (SAS) registered with the Nanterre Trade Register (SIREN: 929 169 217) and headquartered at 120 Rue Jean Jaures, 92300 Levallois-Perret, France.

Byzantine Finance is a technology infrastructure provider and does not operate as a bank, financial institution, regulated intermediary, or crypto-asset custodian. It does not hold client assets nor provide custody or transaction execution. The infrastructure offers technical tools allowing users, under their control, to interact with decentralized finance protocols and regulated third-party partners via self-hosted or third-party wallets, without Byzantine Finance intervening in or controlling assets or transactions.

Byzantine Finance partners with Bridge Building Sp. Z.o.o. (KRS: 0001039515) (“Bridge”) to enable users to conduct certain stablecoin transactions. Byzantine Finance does not make transactions on behalf of users. Applicable services are provided to users directly by Bridge, in accordance with https://bridge.xyz/legal.

Any balance information denominated in fiat currency is for informational purposes only.

Byzantine Finance is not a stablecoin issuer, does not make any promise (and does not have any obligation) to redeem stablecoins.

Byzantine Finance does not hold any balance on behalf of its users and does not pay interest on digital asset balances.

See our Terms & Conditions for more information.

Your cash, working up to 7%*

Two currencies.
Always earning.

5%

7%

Founders and finance teams earn on their treasury with Byzantine

Built on markets institutions already use.

$50B+

$250B+

$1T+

Your cash shouldn’t sit still.

Start earning now

01

02

03

Designed for Institutional confidence

“Transparency is the thing insurers look at most.”

Built to protect what you’ve built.

Two ways to use Byzantine

Put your cash to work

Build returns into your product

Ready to get started?

Double T-Bills.
Institutionally secured.

Double T-Bills.
Same Safety.

Your cash, working up to 7%*

Two currencies.Always earning.

5%

7%

Founders and finance teams earn on their treasury with Byzantine

Built on markets institutions already use.

$50B+

$250B+

$1T+

Your cash shouldn’t sit still.

Start earning now

01

02

03

Designed for Institutional confidence

“Transparency is the thing insurers look at most.”

Built to protect what you’ve built.

Two ways to use Byzantine

Put your cash to work

Build returns into your product

Ready to get started?

Double T-Bills.Institutionally secured.

Double T-Bills.Same Safety.

Cookie Preferences

Two currencies.
Always earning.

Double T-Bills.
Institutionally secured.

Double T-Bills.
Same Safety.