The problem with AI agents handling money has always been the same: give an agent access to a wallet and you’ve handed it the keys to the kingdom. Mysten Labs thinks it has a better way.
Sui Network has unveiled a prototype built on its Seal multi-party computation system that allows AI agents to participate in onchain markets and execute payments without ever receiving or controlling private keys. The Seal MPC system commenced its rollout on Sui’s testnet around June 19, 2026, building on a decentralized key server prototype that first went live on testnet in March of the same year.
What Seal MPC actually does
Seal sidesteps the private key problem entirely. Instead of handing an agent a private key, the system routes transaction authorization through MPC committees, groups of independent nodes that collectively approve or deny a transaction without any single party ever assembling the complete key. The agent proposes, the committee decides, and no individual node can act unilaterally.
Authorization isn’t arbitrary either. Sui’s on-chain Move smart contracts enforce human-readable spending policies automatically, covering things like daily caps, approval thresholds, and counterparty restrictions. An agent can’t simply decide to wire funds to an unknown address if the policy says otherwise. The contract enforces the rule before the transaction ever goes through.
