ERC-4337 account abstraction solves the execution bottleneck for autonomous AI agents in DeFi by replacing private key-based EOAs with programmable smart accounts. The post explains how session keys with scoped permissions (time-limited, function-selector-specific, value-capped), on-chain spending limits, and gas abstraction via Paymasters create machine-safe financial agency. It covers common pitfalls like oracle reads during validation, overly broad session key scopes, and prompt injection risks. It also covers EIP-7702 (Pectra upgrade) and ERC-7579 modular smart accounts as key 2025 developments, and closes with five design principles for production agent wallets.
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