Worked on enhancing the stability and reliability of batch JSON-RPC handling in the wevm/viem repository, focusing on robust error management under rate-limited conditions. Addressed a key issue where the shouldRetry logic did not properly recognize RPC code 429 in batch mode, ensuring that retries are now correctly triggered when rate limits are encountered. Implemented comprehensive unit tests to validate the new behavior and coordinated changeset updates with collaborators. Utilized TypeScript and JavaScript to integrate API error handling and testing, resulting in improved resilience and throughput for users interacting with batch requests across multiple providers in production environments.