// GLOSSARY -- BLOCKCHAIN & CRYPTO FUNDAMENTALS

What is a Smart Contract Wallet?

1 min read Updated

A smart contract wallet is a cryptocurrency wallet implemented as a deployed smart contract rather than a simple externally owned account (EOA) — enabling programmable transaction validation, custom authorization logic, and modular security features.

WHY IT MATTERS

Smart contract wallets (also called smart accounts) replace the rigid 'one key controls all' model of EOAs with programmable logic. The wallet is a smart contract that defines its own rules for what constitutes a valid transaction.

This programmability enables features impossible with EOAs: multi-signature requirements, spending limits enforced on-chain, session keys with scoped permissions, social recovery (recover access without seed phrases), and batched transactions (multiple operations in one tx).

For AI agents, smart contract wallets are the ideal foundation. You deploy a smart contract wallet for the agent, configure spending rules in the contract, and give the agent a session key. The agent can transact within the smart contract's rules — and can't exceed them, even if compromised.

HOW POLICYLAYER USES THIS

PolicyLayer embeds spending rules into smart contract wallets used by agents. Policies are enforced at the smart contract level — making them tamper-proof, verifiable on-chain, and impossible to bypass from the agent's side.

FREQUENTLY ASKED QUESTIONS

How is a smart contract wallet different from a smart account?
They're the same concept. 'Smart contract wallet' emphasizes the implementation (it's a smart contract). 'Smart account' emphasizes the functionality (it's an account with smart features). Both refer to contract-based wallets with programmable logic.
Are smart contract wallets more expensive?
Deployment costs gas (one-time). Transactions cost slightly more than EOA transactions due to additional contract logic. But gas sponsorship (paymasters) and batching often make the total cost comparable or lower.
What if the smart contract has a bug?
This is the critical risk. Smart contract wallet bugs can lock or lose funds. Use audited, battle-tested implementations (Safe, Kernel, Coinbase Smart Wallet) rather than custom code.

FURTHER READING

Enforce policies on every tool call

Intercept is the open-source MCP proxy that enforces YAML policies on AI agent tool calls. No code changes needed.

npx -y @policylayer/intercept
github.com/policylayer/intercept →
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