# Data Availability for ETH Rollups and Ethereum Developers [NEAR Foundation](https://near.foundation/) just announced the rollout of the NEAR Data Availability (NEAR DA) layer. Part of the NEAR Open Web Stack, NEAR DA is a groundbreaking innovation that offers robust, cost-efficient data availability for ETH rollups and Ethereum developers. NEAR DA is set to launch with a number of first users, including Madara by StarkNet, Caldera, Fluent, Vistara, Dymension RollApps, and Movement Labs. Let’s take a brief look at NEAR DA to explore why it’s such an exciting and significant development for NEAR, Ethereum, and the larger effort to build a truly open web. **NEAR DA — paving the way for modular blockchain development** With NEAR DA, ETH rollups and Ethereum developers get cost-effective, reliable data availability. 100kB of calldata on NEAR will cost $0.0033 as of September 2023, while the same calldata on Ethereum L1 will run users $26.22. That’s 8,000 times cheaper! NEAR DA will help developers reduce costs and enhance the reliability of their rollups, while keeping the security of Ethereum. High quality projects launching an app-chain or L2 will also be able to get NEAR DA support. Illia Polosukhin, co-founder of NEAR Protocol, and newly announced CEO of NEAR Foundation said: “Offering a data availability layer to Ethereum rollups highlights the versatility of NEAR’s tech while also helping founders from across Web3 deliver great products that bring us closer to mainstream adoption of the Open Web.”