Blue Fox Notes | The Most Strategically Valuable Layer 2 for Ethereum

The most strategically valuable Layer 2 for Ethereum may not be the one that continues to optimize wallets and DeFi for humans, but rather an execution layer built specifically for AI Agents. This type of L2 has the potential to bring genuine exponential growth to Ethereum, explosive on-chain activity, and establish Ethereum as the “trust and coordination layer” of the AI world.
AI Agents users are beginning to enter; currently, over 20,000 AI Agents are active on Ethereum (exploded just weeks after the ERC-8004 standard launched). These Agents don’t need browsers, mobile apps, or “user-friendly UI.” They require high-frequency microtransactions, low latency, verifiable computations, privacy protection, and machine-to-machine payments.
Humans use L2 to save gas and achieve quick confirmations, but Agents use L2 for 24/7 autonomous operation strategies, collaboration, paying service fees, and settling intents.
Ethereum’s infrastructure is gradually getting ready:
ERC-8004 is the “trust infrastructure” paving the way for this. The standard is set to go live on mainnet and multiple L2s by late 2025 or early 2026, providing on-chain identity, reputation registries, and verification mechanisms for AI Agents. Agents can discover, evaluate, and trust each other across organizations and chains without centralized middlemen.
If AI Agents grow larger and develop faster, L2 will become the “economic coordination layer” for Agents, rather than just a “front-end interface layer” for humans.
The truly interesting L2s are those designed specifically for AI Agents:

• Agents require dozens or even hundreds of interactions per second for real-time arbitrage, data feeding, risk assessment, etc., with very low gas costs. Base has already implemented gasless or ultra-low fee machine payments via the x402 protocol.
• Privacy is increasingly critical: when AI Agents handle sensitive strategies, user intents, or private data, they need ZK proofs or Fully Homomorphic Encryption (FHE) to hide computations while still allowing result verification. zk rollups naturally fit here. This might be ZKsync’s last big opportunity—seizing it could be pivotal.
• Intent networks and multi-Agent collaboration are also vital: users only specify their intent (“Find me the highest-yield ETH strategy on Base”), while multiple backend Agents (strategy Agents, risk Agents, execution Agents) automatically divide tasks, negotiate, and execute.
• AI Agents and the “safe economy” support payments, collateral, slashing (punishments), and reputation accumulation among Agents. Agents can hold assets, borrow, and form DAOs.
• High throughput + verifiable off-chain computation is a feasible path: most computations run off-chain, with results verified on-chain (via ZK proofs, etc.).

Current developments include:
Optopi: A Layer 2 built specifically for AI Agents using the OP Stack, executing Agent intents. Its goal is to make AI user activity far surpass human activity, becoming the “AI Agent L2.”
Base: Gasless + x402 payments + ERC-8004 support, hosting many Agents running DeFi automation and social coordination.
Other ZK L2s (like zkSync, Linea): Due to privacy and verifiability, increasingly viewed as the preferred execution environments for Agents. Perhaps by 2026, ZK rollups will dominate machine-to-machine transactions.

The focus shifts from “how to make humans more comfortable using the chain” to a complete re-architecture—assuming zero human users on-chain, only countless self-organizing, trading, and collaborating AI Agents.
The most powerful L2 will be the one that enables the scale, trust, and profitability of the Agents economy.

One sentence summary:
L2 designed for AI Agents is the true key to unlocking Ethereum’s next 10x growth. Human-focused L2s will continue to exist, but an Agents-specific L2 will bring a new scale of on-chain economy, TVL, and narrative. The future may not be “people on-chain,” but “Agents bringing human intentions and assets on-chain.”