Base-Sepolia RPC Endpoint and API
Base-Sepolia is the official testnet for Base, a secure, low-cost Ethereum Layer 2 built on the OP Stack and incubated by Coinbase. It provides a production-parity environment for developers to test smart contracts, dApps, and wallet integrations before deploying to Base Mainnet. OnFinality offers managed Base-Sepolia RPC endpoints, 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://base-sepolia.api.onfinality.io/public'https://base-sepolia.api.onfinality.io/publicGo to Growth Plan
- High Performance
- Powerful RPC Analytics
- Up to 500 rps
- No daily response limit
- Priority Support
- Decentralized Servers
OnFinality Base-Sepolia RPC features
OnFinality provides authenticated HTTP endpoints for Base-Sepolia, designed for team projects and higher-volume workloads. Key features include:
- Archive access: Query historical state for debugging and analytics
- Request analytics: Monitor usage, errors, and limits through the OnFinality dashboard
- Scalable infrastructure: Upgrade from shared endpoints to dedicated nodes as your needs grow
- Global availability: Endpoints hosted in N. Virginia with low-latency access
Resources
Build faster with Base-Sepolia RPC endpoints
Use OnFinality's Base-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 Base-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 Base-Sepolia blocks, transactions, balances, events, and chain state through HTTPS JSON-RPC workflows.
Operate Base-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 Base-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 Base-Sepolia state.
Choose the right Base-Sepolia RPC setup
Different Base-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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