Biconomy has proposed a new Ethereum standard, ERC-8211, that introduces “smart batching” to allow AI agents and smart accounts to perform complex multi-step DeFi operations in a single transaction, while resolving the parameters of each step at runtime rather than at signing. The standard, published on April 6, 2026, is designed as a contract layer encryption that works with existing account abstraction frameworks and does not require an Ethereum protocol fork.
🗞️ Biconomy introduces ERC-8211 ‘smart batching’, allowing multiple actions to be performed together in a single transaction while resolving values dynamically.
The system allows AI agents to execute complex multi-step DeFi workflows without hard coding parameters or hard forks. pic.twitter.com/82ZzdcvXgQ
– Bitcoin.com News (@BitcoinNews) April 7, 2026
According to Biconomy, ERC-8211 addresses a core bottleneck in current DeFi infrastructure: most batch systems lock all parameters before a transaction reaches the chain, even when later steps depend on outcomes that are unknown in advance, such as the exact yield of a token swap or a loan withdrawal. “Smart batching resolves parameters at runtime,” the ERC-8211 specification explains, allowing each parameter in a batch to specify how its value should be obtained – as a literal, via a static call, or from an on-chain balance – and what constraints it must meet before the batch can continue.
The ERC-8211 specification describes a batch format where each input parameter contains three pieces of information: a fetch type to define how the value is obtained, routing information that decides whether it becomes a call target, value field, or call data, and inline predicates that must be retained or the entire batch is rolled back. That structure allows an AI agent to express flows like “exchange token A for token B on Uniswap and then deposit what actually comes into Aave,” with the second step taking the amount from the resolved output of the first call instead of a guessed number.ethereum-magicians+3
Smart batching also introduces “predicate data” that is only assertion-based, where a batch step has no call target and instead encodes a Boolean condition on the chain state – for example, asserting that a wallet’s WETH balance remains above a safety threshold after a leverage loop. These predicates use the same runtime resolution path as regular actions and act as gates between steps, turning a batch into what the specification calls “a program with embedded security checks, not a hopeful script.”
Commenting on Decrypt, Ethereum Foundation researcher Barnabé Monnot said that ERC-8211 fits directly into the organization’s user experience roadmap. “The Ethereum Foundation protocol cluster has ‘Improve UX’ as one of its strategic priorities,” Monnot said, adding that “ERC-8211 support comes from this strategic priority” and that the collaboration with Biconomy began at a 2025 workshop convened by the Foundation’s Enhance UX initiative.
Monnot argued that “the agent execution angle is new, but has emerged given the rapid developments in the agent space over the past three months,” calling ERC-8211 “a perfect use case because agents can orchestrate complex cross-chain interactions, and ERC-8211 gives them the right platform to do that.” Biconomy, which describes itself as “the smart wallet and execution engine for powerful DeFi and autonomous onchain agents,” has previously worked on tooling for account abstraction and gasless UX, and says ERC-8211 can be implemented directly in TypeScript clients that construct batches against its encoding.