# Introduction

<figure><img src="https://1694265157-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F3TBwtPMEVIGQI1B6u4Ii%2Fuploads%2FlD7zwhzbswx8CtbVp8hj%2Fimage.png?alt=media&#x26;token=9cc17d73-8ee1-42b8-bfe2-819b03ede9ab" alt="" width="563"><figcaption></figcaption></figure>

Herodotus is a powerful data access middleware that provides smart contracts with synchronous access to current and historical on-chain data across Ethereum layers.&#x20;

Our solutions enable smart contracts to access:

* L1 states from L2s
* L2 states from both L1s and other L2s
* L3/App-Chain states to L2s and L1s

## Our Products and Services

<table data-view="cards"><thead><tr><th></th><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>Storage Proofs</strong></td><td>Combination of inclusion proofs, which confirm data's presence, and proofs of computation which validate the execution of a multi-step workflow to attest the validity of elements in a large dataset (e.g. Ethereum blockchain or a rollup).</td><td></td><td><a href="developers/storage-proofs">storage-proofs</a></td></tr><tr><td><strong>Storage Proof API</strong></td><td><p>Easily integrate storage proofs into your app by utilizing the Storage Proof API. <br></p><p>No need to understand cryptography, zero-knowledge proofs, or how to write circuits.</p></td><td></td><td><a href="developers/storage-proof-api">storage-proof-api</a></td></tr><tr><td><strong>Turbo</strong></td><td><p>A smart contract interface for the Storage Proof API. </p><p></p><p>Herodotus Turbo enables trustless interoperability between Ethereum Layers by writing only one line of code!</p></td><td></td><td><a href="developers/turbo">turbo</a></td></tr></tbody></table>