Altheia

Altheia is the on-chain control plane for AI agents on Sui. An agent gets its own key and a vault governed by a Move Policy object: per-transaction and per-day spend caps, an allowed-action set, a protocol scope, an expiry, and instant revocation. The SDK builds the policy-gated transactions. The contract enforces the policy. An over-budget or out-of-scope action reverts on-chain. The contract enforces it, not a server you trust.

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The spec

Sui Foundation’s Overflow 2026 Agentic Web sub-track 2 specifies a Move policy object granting an AI agent a capped budget and protocol scope, with self-enforced ceilings, on-chain activity logs, and owner revocation. Altheia is the implementation: a Move Policy shared object, a Vault, a non-transferable AgentCap, a DeepBook adapter, and on-chain audit events.

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What Altheia is not

• Not a wallet. The agent holds its own key; Altheia governs what that key may do.
• Not a payment rail. The DeepBook adapter is one gated action, not a settlement service.
• Not a server-side guard. Enforcement is in the Move contract. The backend reads chain state; it does not decide it.

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The policy model

An operator provisions one agent: a vault funded with a budget asset, and a Policy that grants the agent’s AgentCap a scoped capability. Every agent action routes through policy::check_and_consume, which asserts the policy is live and the spend is within the caps before any coin leaves the vault. A denied action aborts; no coin moves. Caps live in a shared object, so cumulative daily spend persists across transactions. An agent cannot bypass a cap by splitting a spend across multiple PTBs.

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Start here

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