Opacus is the privacy layer for everything on Solana. Private balances for SOL, stablecoins and any token. Private payments to an Opacus address, or as a link anyone can claim with no SOL. Private payroll and supplier payments for teams. Selective proofs: show that a balance passes a threshold, never the figure. Private payments by AI agents, on behalf of the people they serve. One shared pool, open to every wallet and app through the Opacus SDK. Every new user makes everyone more private. Non-custodial by design.