Optimism RPC Endpoint

Fast, flat-rate Optimism RPC node provider — free tier, no KYC, HTTP & WebSocket.

Optimism (OP Mainnet) is an Ethereum L2 optimistic rollup and the foundational chain of the Superchain — a network of OP Stack rollups including Base, Mode, Zora, World Chain, and more. OP Mainnet pioneered the modular rollup-as-a-service model.

About Optimism

Optimism launched its mainnet in December 2021 and rebranded as "OP Mainnet" with the Superchain announcement. The chain runs the OP Stack, an open-source modular rollup framework that any team can use to launch their own L2. Block times are 2 seconds; gas fees scale with Ethereum mainnet fees but are typically 10-50x cheaper.

The Optimism Collective governs the network through the bicameral structure of the Token House (OP holders) and Citizen House (selected individuals). Retroactive Public Goods Funding (RetroPGF) is one of the most-watched mechanisms in onchain governance.

Common Use Cases on Optimism

• DeFi (Velodrome, Synthetix, Uniswap V3, Aave)
• Cross-Superchain interoperability via shared sequencing
• Worldcoin (Worldchain) and identity applications
• Retroactive funding for public goods
• Building new L2s via the OP Stack

Optimism Ecosystem

Velodrome is the dominant DEX. Synthetix's perpetual futures, Uniswap V3, Aave V3, and the broader Superchain (Base, Mode, Zora, Worldchain, Lisk) all interoperate via shared OP Stack primitives.

HTTP Endpoint

WebSocket Endpoint

Quick Start: Connect to Optimism

cURL

curl -X POST https://rpc.swiftnodes.io/rpc/optimism?key=YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'

ethers.js

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider(
  "https://rpc.swiftnodes.io/rpc/optimism?key=YOUR_API_KEY"
);

const blockNumber = await provider.getBlockNumber();
console.log("Optimism block:", blockNumber);

viem

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://rpc.swiftnodes.io/rpc/optimism?key=YOUR_API_KEY"),
});

const blockNumber = await client.getBlockNumber();

web3.py

from web3 import Web3

w3 = Web3(Web3.HTTPProvider("https://rpc.swiftnodes.io/rpc/optimism?key=YOUR_API_KEY"))
print("Optimism block:", w3.eth.block_number)

Add Optimism to MetaMask

Bridging to Optimism

Native Optimism Gateway at https://app.optimism.io/bridge for canonical bridging. Across, Hop, Stargate, Squid for fast bridges. Cross-Superchain bridging is being unified via the Superchain Interop standard.

Features of SwiftNodes for Optimism

• Multiple load-balanced upstream nodes for high availability
• Health-checked every 60 seconds with automatic failover
• Free tier available — no credit card or KYC required
• Flat-rate monthly pricing with no per-request fees
• HTTP and WebSocket support
• One API key works across all 75+ supported chains, including Optimism

Rate Limits

Frequently Asked Questions: Optimism