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Sepolia RPC Endpoint and API

Sepolia is the main Ethereum testnet for staging production-like contract and wallet flows before deployment to Ethereum mainnet.

Chain ID11155111

CurrencyETH

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Public endpoint rate limit: 5 req/sec

Quick Start

Mainnet Sepolia

curl -H 'Content-Type: application/json' -d '{"id":1,"jsonrpc":"2.0","method":"eth_blockNumber"}' 'https://eth-sepolia.api.onfinality.io/public'

curl -H 'Content-Type: application/json' -d '{"id":1,"jsonrpc":"2.0","method":"eth_blockNumber"}' 'https://eth-sepolia.api.onfinality.io/public'

HTTPs

https://eth-sepolia.api.onfinality.io/public

https://eth-sepolia.api.onfinality.io/public

Websocket

wss://eth-sepolia.api.onfinality.io/public-ws

wss://eth-sepolia.api.onfinality.io/public-ws

Deploy Dedicated Node

Go to Growth Plan

High Performance
Powerful RPC Analytics
Up to 500 rps
No daily response limit
Priority Support
Decentralized Servers

Get Started

Sepolia endpoint details

Common methods to test: eth_blockNumber, eth_call, eth_getLogs, eth_sendRawTransaction
Best-fit workloads: smart contract testing, wallet staging, testnet transaction flow, debugging and log queries

Resources

Additional Info

Build faster with Sepolia RPC endpoints

Use OnFinality's 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 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 Sepolia blocks, transactions, balances, events, and chain state through HTTP and WebSocket workflows.

Operate 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 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 Sepolia state.

Choose the right Sepolia RPC setup

Different Sepolia products need different infrastructure. OnFinality gives teams a practical path from public RPC testing to production-grade API and node operations.