Program caps at 5,000 USDC combined positions and calculates payouts every four hours.
MetaMask, Linea, and Brevis have teamed up to introduce a zero-knowledge proof-based rewards program, offering a fixed 2.4% APR for MetaMask Card users lending or borrowing USDC on Aave’s Linea market.
Announced on August 13, the initiative operates entirely on-chain and is powered by Incentra, a rewards infrastructure built by Brevis.
According to Brevis, the goal is to create a system where incentives are transparent, verifiable, and trustless. The program is live for MetaMask Card users who have completed at least one transaction with the card.
Rewards are calculated automatically, with no opt-ins or extra liquidity steps needed.
The setup uses zero-knowledge proofs to verify balances and eligibility every four hours. Users can claim rewards directly on Incentra, ensuring payouts are public, auditable, and free from centralized control.
The collaboration is being viewed as a move to redefine how DeFi incentives are managed. The emphasis is on reducing friction while preserving sovereignty and privacy for participants.
The fixed-rate program applies to both lending and borrowing positions, up to a combined limit of 5,000 USDC. Interest is distributed in epochs, with calculations based on a time-weighted average balance across each four hours.
Rewards are issued through Incentra’s smart contracts on Linea, using cryptographic proofs generated by Brevis. These proofs confirm that the position meets the campaign rules, the balance is valid, and the payout amount is correct, all without manual verification.
Linea has positioned itself as a layer-2 platform for scalable, low-cost transactions, and this integration is intended to drive total value locked (TVL) by making passive yield straightforward. Industry watchers expect that the simplicity of automatic, on-chain rewards could draw more liquidity from users who might otherwise avoid active yield farming.
Brevis’ Pico ZKVM technology handles the verification process, while the ZK coprocessors ensure calculations align exactly with on-chain Aave data. This keeps the system fully decentralized and eliminates reliance on off-chain tracking.
The partnership builds on shared principles between MetaMask and Linea, particularly privacy and user control. In the past, DeFi reward programs have often involved opaque rules or centralized tracking systems. By contrast, this campaign’s rules and proof mechanisms are visible and verifiable by anyone.
Brevis sees this as a milestone, showing that ZK-powered reward verification can handle a large, global user base. The company indicated that the same architecture could be applied to multi-protocol, cross-chain reward systems in the future.
For now, the offer applies exclusively to Aave’s USDC market on Linea. If uptake is strong, similar ZK-verified incentive programs could expand across other protocols, potentially reshaping how rewards are handled in decentralized finance.
