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Base-Sepolia RPC Endpoint and API Service

Base is a secure, low-cost, builder-friendly Ethereum L2 built.

Connect to Base-Sepolia in seconds with OnFinality RPC endpoints, request analytics, scalable rate limits, and 99.99% uptime for production Web3 apps.

Base is a secure, low-cost, builder-friendly Ethereum L2 built.

Create RPC Endpoint

Base-Sepolia RPC Endpoint

The below example uses the public API endpoint*. This endpoint is only suitable for testing. To avoid rate limiting and service interruption, sign up now to get your own API key.
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/public

* The public endpoint is rate limited

RPC API Service

RPC API Features

Archive

RPC Regions

N.Virginia

Use OnFinality for Base Sepolia RPC endpoints, Base testnet API access, and developer testing workflows. OnFinality supports teams building Base applications before deploying production workloads to mainnet.

Base is a secure, low-cost, builder-friendly Ethereum L2 built to bring the next billion users onchain.

Base is incubated within Coinbase and plans to progressively decentralize in the years ahead. We believe that decentralization is critical to creating an open, global cryptoeconomy that is accessible to everyone.

Additional Info

Project Website
Documentation
RPC API SERVICE
Reliable RPC endpoints with high rate limits
Powerful RPC request analytics
99.99% uptime
Connect via HTTPS or websocket
Decentralised servers hosted globally
Full archive access at no extra cost
PRICING

Calculate Your Costs

Only pay for what you need.

Million Standard Requests
0100M200M300M400M
Total Cost
$49/ month

Recommended Plan: GROWTH

Continue with this plan

Latest Base-Sepolia Updates!

OnFinality graphic on building a dApp on Base Sepolia, highlighting what most Web3 guides leave out

Mar 06,2026

Building a dApp on Base Sepolia? Here’s What Most Web3 Guides Leave Out

Most Web3 guides skip the infrastructure layer. Discover how to build a blockchain dApp on Base Sepolia with OnFinality and understand the architecture that makes it scalable.

View all blogs
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