Arbitrum RPC Endpoints & Dedicated Nodes | OnFinality

Arbitrum RPC Endpoints & Dedicated Nodes

Arbitrum is a leading Ethereum Layer 2 scaling solution that uses optimistic rollup technology to deliver faster transactions and lower fees while inheriting Ethereum's security. Developers building on Arbitrum need reliable RPC endpoints to interact with the network for reading data, submitting transactions, and powering backend services.

OnFinality provides managed Arbitrum RPC endpoints and dedicated node hosting, giving teams production-ready infrastructure without the overhead of running their own nodes.

What is an Arbitrum RPC Endpoint?

An Arbitrum RPC endpoint is a network URL that applications use to communicate with the Arbitrum blockchain. It allows wallets, dApps, and backend services to read on-chain data, send transactions, and interact with smart contracts. OnFinality offers both HTTP and WebSocket endpoints for Arbitrum mainnet.

Why Use OnFinality for Arbitrum RPC?

• Managed API Endpoints: Get started quickly with authenticated RPC endpoints, no node setup required.
• Archive & Trace Support: Access historical state and trace data for analytics, audits, and debugging.
• Dedicated Nodes: Deploy a private Arbitrum node for full control, higher throughput, and custom configuration.
• Observability: Monitor request usage, errors, and latency through the OnFinality dashboard.
• Scalable Plans: Start with shared API endpoints and scale to dedicated infrastructure as your project grows.

Use Cases for Arbitrum RPC

• DeFi Protocols: Submit transactions, query liquidity pools, and monitor positions.
• Wallets: Fetch balances, transaction history, and send transactions.
• Analytics Tools: Access archive data for historical analysis and reporting.
• Games & NFTs: Interact with game contracts and NFT marketplaces.
• Backend Services: Automate on-chain operations with reliable API access.

Connecting to Arbitrum with OnFinality

1. Create or sign in to your OnFinality account.
2. Select Arbitrum from the supported networks list.
3. Create an API endpoint or deploy a dedicated node.
4. Test the endpoint using eth_blockNumber.
5. Monitor usage and limits before moving critical traffic.

Public vs Private RPC

Public Arbitrum RPC endpoints are suitable for lightweight testing but often have rate limits and no guarantees. OnFinality's authenticated endpoints provide clearer limits, request analytics, and a path to higher-capacity infrastructure for production workloads.

Key Facts

• Network: Arbitrum One (mainnet)
• Chain ID: 42161
• Protocol: EVM JSON-RPC
• Transport: HTTP, WebSocket
• Advanced Access: Archive, trace, dedicated nodes
• Common Users: dApps, wallets, DeFi, analytics, games, bots, backend services