SoK: Blockchain Agent-to-Agent Payments

Battle Count: 79

The paper is primarily about agent-to-agent payment infrastructure and security rather than quantitative trading. However, it has tangential relevance: (1) blockchain payment rails could underpin algorithmic trading settlement, (2) agent-based market interactions involve payment mechanisms, (3) the security challenges (prompt injection, key leakage) apply to trading agents, (4) delegated spend control parallels risk management in automated trading. The connection is indirect and infrastructure-level rather than strategy-level.

While the paper itself is a survey (no implementation), the systems it describes involve significant complexity: smart contract development, account abstraction (ERC-4337), off-chain/on-chain settlement coordination, cryptographic proof systems, and multi-agent protocol design. Implementing the proposed future directions (shared execution records, behavior-aware control, compositional workflows) would require substantial engineering effort across blockchain, AI, and security domains.

As a Systematization of Knowledge (survey) paper, there is no experimental implementation to reproduce. The paper provides a structured taxonomy and lifecycle model for analyzing existing systems. Reproducibility would involve applying the four-stage lifecycle framework to new or existing A2A payment systems.