Build on it.

The contracts are open source under the MIT licence: anyone may fork, deploy or integrate with them, without permission.

v1, live.

v1 known issues. Three are disclosed, each reproduced by tests: two in the integrated marketplace, with no funds at risk; one in repayment of USDC loans, which puts the borrower's collateral at risk.

Composing an instrument on v2. An instrument is an orchestrator that creates obligation sets and liens. Third-party origination calls Obligation and Lien directly, with no permission, no upgrade and no whitelist application; each set records its creator and is handled by the same rules.

The one exception, while it exists: a contract that moves balances in the vault for its users must be an authorised consumer of the vault.

To belong to the base layer, a product meets its membership rule.

On v2, the building blocks are specified, not yet built, and their specifications are not yet published; the guides above are for v1.

Status: v1 Live (v1, audited); v2 in development on Arbitrum Sepolia, unaudited; its building blocks are specified, and the core's first testnet deployment is pending.