> For the complete documentation index, see [llms.txt](https://docs.altlayer.io/altlayer-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.altlayer.io/altlayer-documentation/public-testnets/op-eigenda-testnet.md).

# OP EigenDA Testnet

## Overview

OP EigenDA testnet is an OP stack powered L2 that uses EigenDA as its data availability layer. 

In OP EigenDA,  L2 transaction data are written to EigenDA instead of Ethereum calldata. The resulting EigenDA blob key is then written to Ethereum calldata. By doing so, the cost of the calldata becomes relatively negligible, even when the actual blob data is megabytes in size. The sequencer will then be able to retrieve the blob keys from the calldata and then retrieve the blob from EigenDA. 

To learn more about OP EigenDA, refer to EigenLayer's [OP Stack + EigenDA User Guide](https://docs.eigenlayer.xyz/eigenda-guides/eigenda-rollup-user-guides/op-stack-+-eigenda-user-guide).

## OP EigenDA Testnet info

| Parameter        | Value                                                               |
| ---------------- | ------------------------------------------------------------------- |
| Network Name     | OP EigenDA Sepolia Testnet                                          |
| Chain ID         | `202402230102`                                                      |
| Currency Symbol  | ETH                                                                 |
| Settlement Layer | Sepolia Testnet                                                     |
| Rollup Info Page | <https://rollup-info.altlayer.io/public/op_eigenda_sepolia_testnet> |
| Explorer         | <https://op-eigenda-sepolia-explorer.alt.technology>                |
| Public RPC URL   | <https://op-eigenda-sepolia.alt.technology>                         |
| Bridge           | <https://op-bridge.alt.technology/deposit?id=202402230102>          |

## Short Guide

1. To start using the network, you can add it to your wallet by visiting the [Rollup Info Page](https://rollup-info.altlayer.io/public/op_eigenda_sepolia_testnet).<br>

   <figure><img src="/files/KLZ1awQtlH9xHEhPYtq3" alt=""><figcaption><p>OP EigenDA Testnet rollup info page</p></figcaption></figure>
2. Next, visit the [bridge interface](https://op-bridge.alt.technology/deposit?id=202402230102) to bridge your Sepolia Testnet ETH to OP EigenDA Sepolia testnet.

{% hint style="info" %}
You can obtain Sepolia Testnet ETH from public faucets like <https://sepoliafaucet.com/> or <https://www.sepoliafaucet.io/>.
{% endhint %}

<figure><img src="/files/s1JCHmtMBQYpEBJmIyFR" alt=""><figcaption><p>Bridging 0.1 Sepolia Testnet ETH to OP EigenDA Sepolia Testnet</p></figcaption></figure>

3. Once deposit is initialised, it will take \~1min for the deposit to arrive on OP EigenDA Sepolia Testnet. After which, you can use the network to start deploying your contracts.

<figure><img src="/files/VMmmGdV7qKCclKXsIQeo" alt=""><figcaption><p>Deposit confirmation of 0.1 Sepolia Testnet ETH to OP EigenDA Sepolia Testnet</p></figcaption></figure>


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