# Arbitrum One

Arbitrum One is a Layer-2 scaling solution for Ethereum, enhancing transaction speed and efficiency by offloading processing to a secondary blockchain while remaining connected to the Ethereum mainnet.

## What makes Arbitrum One unique?

Arbitrum facilitates easy deployment of Ethereum-compatible smart contracts without modifications, easing the migration of dApps and DeFi protocols and reducing the Ethereum network load. Through Optimistic Rollup, it achieves fast, cost-effective off-chain transaction processing, with fraud proofs ensuring transaction validity and maintaining rapid speeds while upholding network security.

## Related

[What we support](/what-we-support) · [Node-as-a-Service](/products/node-as-a-service) · [Developer portal](https://developers.cryptoapis.io/)