What is Base RPC and how do you choose the right endpoint?

Base RPC decision checklist

Before selecting a Base RPC provider, evaluate these key criteria:

What is Base RPC?

Base is an Ethereum Layer 2 blockchain built by Coinbase using the OP Stack. It offers low fees and high throughput while inheriting Ethereum's security. A Base RPC endpoint allows wallets, dApps, and backend services to communicate with the Base network via JSON-RPC calls. The API is fully EVM-compatible, meaning you can use standard Ethereum methods like eth_call, eth_sendTransaction, and eth_getBalance.

Base chain settings

To connect to Base, you need the following network details:

• Network Name: Base Mainnet
• Chain ID: 8453 (0x2105)
• Currency Symbol: ETH
• Block Explorer: https://basescan.org
• RPC Endpoint: Provided by your node or RPC service

For testnet development, use Base Sepolia:

• Network Name: Base Sepolia
• Chain ID: 84532
• Currency Symbol: ETH
• Block Explorer: https://sepolia.basescan.org

How to choose a Base RPC provider

Selecting the right Base RPC provider is critical for production applications. Here are the main factors to consider:

1. Reliability and uptime

Your dApp must stay online. Public RPC endpoints like https://mainnet.base.org are free but have no SLA and can become unavailable during high traffic. For production, use a managed provider that offers uptime guarantees and redundant infrastructure.

2. Rate limits and scalability

Public endpoints typically limit requests per second or per day. If your app scales, you'll need a provider that allows higher throughput. Some providers offer pay-as-you-go plans or dedicated nodes.

3. Archive data support

Many smart contract interactions require historical state. For example, querying an old balance or past events. Not all providers offer archive nodes. Check if the provider supports archive data for Base.

4. WebSocket support

Real-time features like price feeds or transaction monitoring require WebSocket connections. Ensure your provider offers a WSS endpoint.

5. Security and privacy

Public RPCs can expose your IP address and request metadata. Private endpoints or those with privacy features (like 1RPC) help protect user data.

6. Pricing

Free tiers are great for development, but production apps often need paid plans. Compare pricing models: per-request, monthly subscription, or dedicated node rental.

Example: Connecting to Base with ethers.js

Here's how to connect to a Base RPC endpoint using ethers.js:

const { ethers } = require("ethers");

// Replace with your RPC URL
const RPC_URL = "https://your-base-rpc-url";
const provider = new ethers.JsonRpcProvider(RPC_URL);

async function getBlockNumber() {
  const blockNumber = await provider.getBlockNumber();
  console.log("Current block number:", blockNumber);
}

getBlockNumber();

For WebSocket connections:

const { ethers } = require("ethers");

const WSS_URL = "wss://your-base-wss-url";
const provider = new ethers.WebSocketProvider(WSS_URL);

provider.on("block", (blockNumber) => {
  console.log("New block:", blockNumber);
});

Common pitfalls and troubleshooting

Rate limiting

If you receive errors like 429 Too Many Requests, you've hit the rate limit. Upgrade to a paid plan or reduce request frequency.

Outdated data

Ensure your provider is synced with the latest block. Archive nodes are essential for historical queries.

WebSocket disconnections

WebSocket connections can drop. Implement reconnection logic in your application.

Chain ID mismatch

Always verify the chain ID (8453 for mainnet, 84532 for Sepolia). Using the wrong chain ID will cause transaction failures.

Key Takeaways

• Base RPC endpoints are EVM-compatible and use standard Ethereum JSON-RPC methods.
• Public endpoints are suitable for testing but not for production due to rate limits and reliability concerns.
• When choosing a provider, evaluate reliability, latency, rate limits, archive support, WebSocket, security, and pricing.
• Always use a private or dedicated endpoint for production applications to ensure performance and data privacy.
• Test your connection with simple RPC calls before deploying.

Frequently Asked Questions

What is the Base chain ID? Base mainnet chain ID is 8453. Base Sepolia testnet chain ID is 84532.

Can I use Ethereum tools with Base? Yes, Base is EVM-compatible, so tools like MetaMask, ethers.js, and Hardhat work out of the box.

Do I need an archive node for Base? Only if your application requires historical state data. Many providers offer archive endpoints.

Is there a free Base RPC endpoint? Yes, public endpoints like https://mainnet.base.org are free but rate-limited. For production, consider a managed provider.

How do I get a Base RPC URL? You can obtain one from an RPC provider like OnFinality. Visit the Base network page for details.

For more information on pricing and supported networks, see our RPC pricing and supported networks pages.