T3tris Labs helps asset managers go onchain. It’s a vault infrastructure for asset managers. Permissionless. Zero fees. Full operational flexibility. Anyone can deploy a vault in seconds and execute any strategy on their own timeline, across DeFi, CEX, RWAs, OTC, cross-chain or structured products. Their infrastructure adapts to the strategy, not the other way around.
T3tris, as a French SAS, still held part of its treasury in euros sitting in a regular bank account.
Most French companies hit the same wall. Cash in a bank account produces near-zero yield on euros. The traditional upgrade, a money market fund, means paperwork, minimum ticket sizes, and days of settlement before the money starts working.
“Bank accounts in France generate near-zero yield on EUR. Moving that to a money market fund requires paperwork, minimum ticket sizes, and days of settlement. For a crypto-native company, the friction is absurd given what’s available onchain.”
Romain Lavernhe, Founder, T3tris Labs
The obvious workaround is onchain, but for a French company the bottleneck isn’t the protocols, it’s the fiat boundary. Converting EUR to a stablecoin and back through a compliant on/off ramp, with documentation an accountant will accept, is not something the existing paths handle for a corporate entity. What’s trivial with a personal wallet becomes a structural problem when it’s corporate capital.
After comparing available options, Byzantine emerged as the most compelling fit for T3tris Labs:
What tipped the decision was completeness. Fiat conversion, regulated custody, and a EURC yield vault sat inside a single flow designed for a French legal entity.
“It’s one of the only solutions that handles the full stack: fiat conversion, regulated custody through Bridge and Banking Circle, and a EURC yield vault in a single flow. The deposit certificate it generates is usable for our accountant. Nothing comparable existed at that level of completion for a French legal entity.”
Romain Lavernhe, Founder, T3tris Labs
In March 2026, T3tris deployed a portion of its treasury into a Byzantine Prime vault. The full flow, fiat-to-EURC conversion included, took under an hour end to end. Capital not immediately needed for operations sits in the vault. When funds are required, withdrawals are processed quickly.
Nothing had to change operationally. No active management, no separate monitoring, no new tooling.
“If you’re already comfortable with DeFi mechanics, setup is trivial. If you’re not, the UX is simple enough that it doesn’t matter.”
Romain Lavernhe, Founder, T3tris Labs
T3tris now generates yield on EUR treasury that previously sat idle in a bank account. Setup took under an hour end to end. The accounting workflow has what it needs, without any change to how the company operates.
“Byzantine wraps a EURC yield vault behind a compliant fiat on-ramp and generates documentation your accountant will accept.”
Romain Lavernhe, Founder, T3tris Labs
Even a team operating at the frontier of onchain asset management chose Byzantine rather than assemble the same exposure themselves. The value was not access to DeFi, T3tris already has that. It was the layers a DIY position cannot provide for corporate capital: a compliant fiat-to-vault path, an insurance layer, and an audit trail an accountant can work with.
For any French company holding EUR, the question is whether to leave treasury idle in a bank account or find a way to put it to work without adding operational complexity. Byzantine makes the second path accessible at roughly the same level of friction as the first.
