> ## Documentation Index
> Fetch the complete documentation index at: https://docs.celo.org/llms.txt
> Use this file to discover all available pages before exploring further.

# EigenDA

In contrast to OP Mainnet sequencer which writes TX batches to Ethereum in the form of calldata or, more recently, EIP-4844 blobs to commit to the transactions included in the canonical L2 chain, Celo uses [EigenDA](https://docs.eigenlayer.xyz/eigenda/overview) as an alternative data availability layer in order to minimize the TX fees. EigenDA is a data availability store made by [EigenLabs](https://www.eigenlabs.org) and built on top of [EigenLayer](https://docs.eigenlayer.xyz/eigenlayer/overview/). With EigenDA, TX data is stored by EigenDA operators off-chain, only DA commitments used for verficiation and subsequent data retrieval are stored On Ethereum which significantly reduces DA costs and L2 TX fees.

The integration is done in accordance with the [Optimism's Alt-DA spec](https://specs.optimism.io/experimental/alt-da.html) which contains a more in-depth description of this interface.

## Testnet and Contract Addresses

The Celo Sepolia testnet uses the [EigenDA Sepolia testnet](https://docs.eigencloud.xyz/products/eigenda/networks/sepolia).