Unichain Sepolia RPC & API Endpoints | OnFinality

Unichain’s Sepolia Testnet

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

Unichain’s Sepolia Testnet

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Unichain 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.

* The public endpoint is rate limited

RPC API Service

RPC API Features

ArchiveTrace

Unichain Sepolia RPC Endpoints

Unichain Sepolia is the official testnet for Unichain, a DeFi-focused Ethereum Layer 2 built on the OP Stack. It provides a sandbox environment for developers to test dApps, smart contracts, and DeFi protocols before deploying to mainnet. OnFinality offers managed RPC API endpoints for Unichain Sepolia, giving you reliable access to the testnet without running your own node.

What is Unichain Sepolia?

Unichain Sepolia is an EVM-compatible testnet that mirrors the Unichain mainnet environment. It uses ETH as gas and supports all standard Ethereum JSON-RPC methods, plus rollup-specific methods. Developers use it to test Uniswap-focused DeFi applications, cross-chain liquidity features, and other smart contract interactions in a low-risk setting.

Why Use OnFinality for Unichain Sepolia RPC?

Running a Unichain Sepolia node yourself can be time-consuming and resource-intensive. OnFinality provides:

Managed API endpoints: HTTP and WebSocket access to Unichain Sepolia.
Archive and trace support: Access historical state and debug transactions where available.
Observability: Request analytics and usage metrics to monitor your application.
Scalability: A clear path from shared endpoints to higher-capacity plans.

How to Connect to Unichain Sepolia

Create or sign in to your OnFinality account.
Select Unichain Sepolia from the supported networks list.
Create an API endpoint (shared or dedicated if supported).
Use the provided URL in your Web3 library (e.g., ethers.js, web3.js).
Test with eth_blockNumber and monitor usage.

Use Cases

dApp development: Test wallet integrations, transaction flows, and UI interactions.
Smart contract testing: Deploy and debug contracts in a realistic environment.
DeFi prototyping: Experiment with liquidity pools, swaps, and yield strategies.
Analytics and tooling: Build indexers, dashboards, and monitoring tools.

Key Facts

Network: Testnet (Sepolia)
Chain ID: 1301
Protocol: EVM JSON-RPC
Transport: HTTP, WebSocket
Advanced features: Archive, trace (plan-dependent)
Common users: Developers, QA teams, DeFi projects

Get Started

OnFinality makes it easy to access Unichain Sepolia RPC endpoints. Sign up today and start building on the Unichain testnet with reliable infrastructure.