Pick Coinbase AgentKit if you want open-source code, MPC custody, need Solana support, or prioritize rapid prototyping without smart contract complexity.
Pick MetaMask Smart Accounts if you need user-delegated actions with scoped permissions, prefer smart-account (ERC-4337) architecture, or are already integrated with the MetaMask ecosystem.
Neither is universally superior—they serve different architectural approaches to agent wallets.
| Attribute | Coinbase AgentKit | MetaMask Smart Accounts |
|---|---|---|
| Custody model | MPC Multi-party computation | Smart account ERC-4337 |
| Open source | ✓ Yes | ✗ No |
| Best for | Getting started fast with agent wallets | User-delegated agent actions with scoped permissions |
| Chains | Base Ethereum Polygon Arbitrum Solana | Ethereum Polygon Arbitrum Optimism |
| Base chain support | ✓ Native | ✗ Not listed |
| Solana support | ✓ Yes | ✗ No |
| Optimism support | ✗ No | ✓ Yes |
| GitHub / Source | github.com/coinbase/agentkit | Closed source |
| Developer docs | GitHub repository | metamask.io/developer |
Coinbase AgentKit uses MPC (multi-party computation) custody and is open source, supporting Base, Ethereum, Polygon, Arbitrum, and Solana. MetaMask Smart Accounts uses smart-account (ERC-4337) custody, is not open source, and supports Ethereum, Polygon, Arbitrum, and Optimism. AgentKit is designed for fast agent wallet prototyping; MetaMask Smart Accounts focuses on user-delegated actions with scoped permissions.
Coinbase AgentKit is explicitly designed for getting started fast with agent wallets. Its open-source codebase and MPC-based approach allow developers to prototype quickly without managing smart contract deployments.
MetaMask Smart Accounts is designed specifically for user-delegated agent actions with scoped permissions. Its smart-account architecture enables granular permission sets and session-based delegation that users can revoke or scope to specific operations.
There is no direct migration path between these two systems because they use fundamentally different custody models: MPC versus smart accounts. Switching would require creating new wallets and transferring assets. Any migration would need to be handled as a manual asset transfer rather than an in-place upgrade.
Coinbase AgentKit is open source and free to use, though you may incur network gas fees. MetaMask Smart Accounts does not publish pricing publicly; check MetaMask's developer documentation for current terms. Both may involve transaction fees on their respective networks.