Fine-tuning large language models (LLMs) for specific applications can be constrained by the limited availability of targeted data. Data augmentation steps in to expand existing datasets and improve model performance without manual data collection efforts. MonsterAPI's new Data Augmentation API streamlines this process, allowing developers to augment and scale out Datasets. Data augmentation involves artificially expanding a dataset by creating modified versions of existing data points, maintaining original semantics but differing in syntax or style. This addresses the scarcity of domain-specific data, increasing dataset size, making models more robust, and improving data quality. MonsterAPI's API supports two kinds of data augmentation: Evol-Instruct, which leverages LLMs to generate diverse instruction data, and Ultrafeedback, generating high-quality preference datasets for reinforcement learning from human feedback. A case study demonstrates the benefits of data augmentation, expanding a dataset of 200 rows into 800 rows at a cost of $1.2. The API can be used by sending a https request with specified data details, choosing between generating evolved instructions or preference datasets, and avoiding complexity. The process_id is received in response, and the deployment status can be queried to get the current job state, resulting in a downloadable CSV file link upon completion.