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Ethereum Sepolia Testnet
Connect to the Ethereum Sepolia testnet with BoltRPC's reliable RPC endpoint. Free 2-week trial, no credit card required.
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Add this endpoint to your application to start making requests.
https://eu.endpoints.matrixed.link/rpc/ethereum-sepolia?auth=YOUR_KEY wss://eu.endpoints.matrixed.link/ws/ethereum-sepolia?auth=YOUR_KEY
Replace YOUR_KEY with your API key.
Get a free key →
Choose your preferred library and start building.
import { ethers } from "ethers";
const provider = new ethers.JsonRpcProvider(
"https://eu.endpoints.matrixed.link/rpc/ethereum-sepolia?auth=YOUR_KEY"
);
// Confirm you are on Sepolia (chain ID 11155111)
const network = await provider.getNetwork();
console.log(network.chainId); // 11155111nBoltRPC's 2-week free trial includes testnet access. Your Sepolia workflow uses the same endpoint format, the same API key and the same infrastructure quality as your Ethereum mainnet setup. No separate accounts or configurations for testnet.
Sepolia is the standard testnet for Ethereum smart contract development and dApp testing. BoltRPC gives your Sepolia endpoint the same reliability as your production connections. Automated test suites, staging environments and CI/CD pipelines that rely on Sepolia get consistent, stable RPC access.
Public testnet RPCs drop connections, hit rate limits and lag behind the chain tip. BoltRPC gives your Sepolia workflows the same stability as your mainnet setup. No broken test pipelines from unreliable endpoints.
Use BoltRPC on Sepolia and Ethereum mainnet from the same provider. One API key, one endpoint format, one configuration to manage. When you promote from Sepolia to mainnet, only the endpoint slug changes.
Subscribe to Sepolia testnet events via WebSocket at wss://eu.endpoints.matrixed.link/ws/ethereum-sepolia?auth=YOUR_KEY. Useful for integration test suites that need real-time block confirmation events, contract event subscriptions, or pending transaction monitoring during development.
BoltRPC's endpoint infrastructure is operated by Matrixed.Link, certified to ISO/IEC 27001:2022. For teams in regulated industries or organizations with vendor security requirements, this matters even for testnet access as the same infrastructure serves both testnet and mainnet workloads.
Full Ethereum JSON-RPC specification support.
eth_call eth_sendRawTransaction eth_getBalance eth_blockNumber eth_getTransactionReceipt eth_getLogs eth_estimateGas eth_getCode javascript
import { ethers } from "ethers";
const provider = new ethers.JsonRpcProvider(
"https://eu.endpoints.matrixed.link/rpc/ethereum-sepolia?auth=YOUR_KEY"
);
const wallet = new ethers.Wallet(process.env.PRIVATE_KEY, provider);
// Deploy contract
const factory = new ethers.ContractFactory(abi, bytecode, wallet);
const contract = await factory.deploy();
await contract.waitForDeployment();
const address = await contract.getAddress();
console.log("Deployed to Sepolia:", address);
// Verify deployment
const code = await provider.getCode(address);
console.log("Contract deployed:", code.length > 2);
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