May 2026 monthly summary focused on reliability, interoperability, and developer productivity across matter-labs/zksync-era and matter-labs/zksync-os-server. Key outcomes include stabilized contract verification across zksolc versions, and expanded Ethereum-compatible transaction tooling on both EraVM and OS server RPC surfaces.

April 2026: Delivered two high-impact updates to the contract verifier in matter-labs/zksync-era, improving compatibility with diverse bytecode representations and enhancing error reporting. These changes reduce verification failures, shorten debugging cycles, and support smoother production deployments across different environments.

Month: 2026-03. Focused on expanding DeFi coverage and analytics capabilities within DefiLlama-Adapters.

2025-10 Monthly Summary for wevm/viem focused on delivering consistent timing behavior across ZKSync chains. Implemented BlockTime standardization to 200 ms across abstract, abstractTestnet, sophon, sophonTestnet, zksync, and zksyncSepoliaTestnet, with accompanying changeset documentation.

Monthly summary for 2025-09: focus on expanding customization capabilities of viem's HTTP transport. Delivered a new fetchFn override that allows overriding the default fetch function to implement custom network logic and headers, while preserving API compatibility. This unlocks scenarios like custom proxies, headers, and testable network behavior. No other major bugs were fixed this month; work concentrated on feature delivery and API design for better integration flexibility.

August 2025 (2025-08): Delivered a targeted architectural improvement in wevm/viem by introducing an optional fetchFn override for the HTTP transport. This enables intercepting, decorating, or mocking fetch calls, improving testability, CI reliability, and testing coverage of network behavior. The change is implemented via commit 30d80c216d7a6fc84881f3877a8950d1d71c9bd7 (feat: add optional `fetchFn` override to http transport to allow full fetch interception (#3895)). Overall impact includes better isolation of network interactions, easier experimentation with transport behavior, and a clearer path for future enhancements in the HTTP layer.

2025-07 Monthly Summary for wevm/viem. Key feature delivered: gas estimation for pubdata in ZKSync transactions. Implemented a new action getGasPerPubdata to retrieve the scaled gas per pubdata limit for the currently open batch, with an accompanying test case. Updated the public actions decorator to surface the new capability, enabling developers to estimate gas costs related to pubdata in ZKSync transactions. Major bugs fixed: none this month. Overall impact and accomplishments: improved cost transparency and developer efficiency by enabling accurate gas cost estimation for pubdata, supporting more reliable batching strategies and budgeting for ZKSync flows. Technologies/skills demonstrated: TypeScript/JavaScript, testing, API surface augmentation via decorators, and alignment with Viem/ZKSync gas models.