Zyfai integrates Rhinestone to build the ultimate crosschain DeFi agent

Learn how this DeFi agent platform utilizes Rhinestone to build a  secure yield agent that co-pilots user’s wallets with session keys and instantly rebalances vault positions across chains with Rhinestone intents.

Case Studies
Kurt Larsen
January 15, 2026
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Learn how this DeFi agent platform utilizes Rhinestone to build a  secure yield agent that co-pilots user’s wallets with session keys and instantly rebalances vault positions across chains with Rhinestone intents.

  • $1.36B+ in vault rebalancing transaction volume 
  • Over 15.4% average APY on USDC
  • 9 months of development time saved
“Onchain capital allocation shouldn’t rely on rigid vaults. Zyfai delivers agent-powered smart accounts with superior personalization, automation, and full self-custodial control by leveraging Rhinestone.” – Gauthier Vila, CEO at Zyfai.

The ultimate DeFi Agent is one that co-pilots your account with scoped permissions, unifies your balance across all chains, and executes autonomously with speed to capture yield opportunities. With Rhinestone, Zyfai delivers:

  • Gas abstraction so that agents can transact in stablecoins only, no need to manage native gas tokens.
  • Onchain transaction policies to keep users in full control whilst giving agents the permissions they need to get the job done.
  • Instant crosschain intents to snipe yield opportunities no matter the chain.

With Rhinestone, Zyfai has built a market-leading yield agent that consistently achieves crosschain APYs of over 15%, outperforming competitors without compromising on full self-custody.

About

Zyfai gives you self-custodial access to autonomous low-risk DeFi. Its customisable rule-based Agents transform your idle capital into productive assets, rebalancing between curated opportunities. The result is sustainable and risk-adjusted yield, where your capital is always working and under your control.

Challenge: Seamless crosschain automation without compromising self-custody

Zyfai has been uncompromising in their pursuit of onchain automation. Their goal is to build an agent that can meet the high bar or serving institutions, HNWs and companies with large onchain treasuries. This requires full self-custody with no intermediary sharding or managing access to the user’s keys. It requires best-in-class performance with zero security compromise.

Solution: An intent-based smart account platform for Zyfai agents

Zyfai uniquely solves these challenges by tapping into Rhinestone’s intent-based smart account system. Utilizing session keys for onchain agent permissions, and intents for gas abstraction and instant crosschain rebalances. 

Self-custody with secure onchain agent permissions

With Rhinestone’s Smart Sessions, a multi-chain session key framework, Zyfai enables a fully self-custodial yield agent that executes DeFi strategies within a scoped set of onchain policies once authorized by the user. These policies ensure transparent, immutable guarantees over all agent-authorized actions.

One of the common downsides of session keys is that adding new policies (e.g., a new DeFi protocol) requires additional user approval. We partnered with Zyfai to develop a module that enables dynamic onchain policy adjustments via a multisig. Zyfai’s goal is to decentralise this multisig through the ZFI token or an AVS network secured by staked liquidity. This introduces onchain SMAs as a new model for capital allocation, allowing curators to manage onchain policies for their users through Zyfai’s automation layer.

Most DeFi automation platforms use sudo policies, requiring users to place full trust in the agent whilst posing as self-custody. We’re excited to support Zyfai in striving for zero compromise in its architecture.

Instant, low fee crosschain execution 

One key driver of DeFi yields is supply and demand. APYs increase when liquidity is scarce and compress as capital enters a pool. Therefore, when the Zyfai agent detects an opportunity to rebalance into a pool with high yield, fast execution is critical. 

Furthermore, it’s important that these rebalancing transactions are incredibly cheap. The more expensive it is to perform a crosschain bridge, the less Zyfai can capitalise on higher yield by rebalancing across chains. 

Rhinestone intents enable crosschain execution in 1-3 seconds at a fraction of a percent in fees, guaranteeing Zyfai can snipe opportunities it uncovers.

Simple SDK and API toolset

Rhinestone’s unified SDK and API drastically simplified the developer journey for Zyfai. Accelerating time to market without giving up on key requirements and without having to burn copious engineering hours on infrastructure.

Results: Market-leading APY without compromising on self-custody

With Rhinestone, Zyfai has built a market leading yield agent, achieving crosschain APYs of over 15%! Outperforming competition, all whilst never giving up on core tenets such as full self-custody.

  • $1.36B+ in vault rebalancing transaction volume 
  • Over 15.4% average APY on USDC
  • 9 months of development time saved
“The power of Zyfai lies in personalization: users define their objectives, and the system executes accordingly. Our deterministic agent continuously monitors the market, aggregates onchain data across more than 10 DeFi protocols to determine where capital should be deposited, and leverages the rebalancing engine to automatically rebalance user positions on a daily basis. Rhinestone enables this by abstracting gas, wallet complexity, and intent execution, providing the infrastructure agents need to operate seamlessly onchain.”
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