Arbitrum Sepolia RPC Endpoint and API
Arbitrum Sepolia is the official testnet for Arbitrum One, an Ethereum Layer 2 optimistic rollup. It provides a safe environment for developers to test smart contracts, dApps, and cross-chain interactions before deploying to mainnet. OnFinality offers managed RPC endpoints for Arbitrum Sepolia, giving you reliable access to the testnet without running your own node.
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Public endpoint rate limit: 5 req/sec
curl -H 'Content-Type: application/json' -d '{"id":1,"jsonrpc":"2.0","method":"eth_blockNumber"}' 'https://arbitrum-sepolia.api.onfinality.io/public'https://arbitrum-sepolia.api.onfinality.io/publicwss://arbitrum-sepolia.api.onfinality.io/public-wsGo to Growth Plan
- High Performance
- Powerful RPC Analytics
- Up to 500 rps
- No daily response limit
- Priority Support
- Decentralized Servers
Build faster with Arbitrum Sepolia RPC endpoints
Use OnFinality's Arbitrum Sepolia RPC APIs to connect wallets, dApps, dashboards, bots, and backend services without operating your own node from day one.
Public endpoint testing
Start with the Arbitrum Sepolia public RPC endpoint for lightweight checks, prototypes, and quick integration tests.
Authenticated API access
Move production traffic to authenticated endpoints when you need clearer limits, analytics, and operational visibility.
Standard RPC methods
Query Arbitrum Sepolia blocks, transactions, balances, events, and chain state through HTTP and WebSocket workflows.
Operate Arbitrum Sepolia infrastructure with more control
Production teams need more than an endpoint URL. They need observability, predictable capacity, and a path from shared RPC access to isolated infrastructure.
Request visibility
Track usage patterns and response activity so your team can understand traffic growth before it becomes an incident.
Dedicated node path
Use dedicated Arbitrum Sepolia nodes when your workload needs isolated resources, custom operations, or stronger capacity planning.
Archive and historical data
Plan for archive access when analytics, audits, indexers, or advanced app features need older Arbitrum Sepolia state.
Choose the right Arbitrum Sepolia RPC setup
Different Arbitrum Sepolia products need different infrastructure. OnFinality gives teams a practical path from public RPC testing to production-grade API and node operations.
For prototypes
Use public RPC for simple reads, connection checks, and early experiments where strict performance guarantees are not required.
For live apps
Use authenticated API endpoints when users depend on stable request handling, monitoring, and scalable access.
For heavy workloads
Use dedicated nodes for sustained traffic, latency-sensitive services, validator tooling, exchange systems, and indexing pipelines.
Never Worry about Infrastructure Again
OnFinality takes away the heavy lifting of DevOps so you can build smarter and faster.
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Build and scale blockchain applications with reliable RPC, indexing, and data infrastructure from OnFinality.
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