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Functor installs on any ERC-7579 smart account as a set of modules. Once installed, every transaction the agent makes is policy-checked, fee-collected, and audit-logged - onchain.

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1. Install Functor modules

The developer installs two modules on their smart account:
  • WebAuthnValidator - verifies passkey signatures, reads keys from the KeyStore
  • FunctorPolicyHook - enforces policies before and after every transaction

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2. Configure policies

The developer sets policies for each key - through the dashboard or the SDK. Policies are written directly to the FunctorPolicyHook contract onchain. Policies can include:
  • allowed_contracts - whitelist of contract addresses the agent can interact with
  • allowed_functions - whitelist of function selectors
  • spending_limit - rolling, time-windowed cap per token (e.g., 1000 USDC/day)
  • rate_limit - max transactions per time window, tracked cross-session
  • expires_at - hard expiry timestamp
  • custom - pluggable policy contracts for specialized logic
Policies can be updated at any time without creating new session keys.

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3. Agent transacts

The agent signs a transaction. The smart account routes it through the validator and the hook: If any policy is violated, the transaction reverts. The agent’s funds stay safe. No fee is charged for blocked transactions.

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4. Developer monitors

The dashboard reads onchain state and indexed events to show:
  • Current spending against limits
  • Rate limit usage
  • Full transaction history with policy results
  • Blocked transaction attempts
Everything is verifiable onchain. The dashboard is a read layer - the data lives on the blockchain.