Licence
The Business Source License terms that apply to the Tuo contracts, and the upstream licences of the code they build on.
The Tuo contract sources are published under the Business Source License 1.1 (BUSL-1.1). Every
file under the contracts' src tree carries the SPDX identifier LicenseRef-BUSL-1.1, which
resolves to the parameters below.
Parameters
| Parameter | Value |
|---|---|
| Licensor | Tuo Team |
| Licensed Work | Tuo Protocol smart contracts. The Licensed Work is (c) 2026 Tuo Team |
| Additional Use Grant | None |
| Change Date | 2030-09-08 |
| Change License | GPL-2.0-or-later |
In plain terms: you may copy, modify, redistribute and make non-production use of the contracts today. Production use requires a commercial licence from Tuo until the Change Date. On 2030-09-08, or four years after the first public distribution of a given version if that comes first, that version becomes available under the GPL-2.0-or-later.
The full licence text ships alongside the contract sources and is reproduced in the verified source on the block explorer. A contact address for alternative licensing arrangements will be published on this page.
Why BUSL
BUSL is the licence used by several major DeFi protocols for their core contracts. It keeps the source fully readable and auditable, which matters for a system that asks customers to trust the code rather than the operator, while preventing an unreviewed fork from running production deposits under the Tuo name during the guarded launch. The automatic conversion to GPL guarantees the code becomes free software on a fixed date.
Third-party code
Third-party code is not covered by the BUSL and keeps its upstream terms. Each file carries its own SPDX header, which is authoritative for that file.
| Component | Licence |
|---|---|
Vendored Uniswap LiquidityAmounts and OracleLibrary | GPL-2.0-or-later |
Uniswap INonfungiblePositionManager and IWETH9 interfaces | GPL-2.0-or-later |
| OpenZeppelin Contracts 5.6.1 | MIT |
| Uniswap v3-core | GPL-2.0-or-later or MIT, per file |
The deployment scripts and the test suite are MIT. Only the contract sources are under the BUSL.
Trademarks
The licence grants no rights in the Tuo name or logo. See Brand assets for how the brand may be used.