Optimism RPC Endpoint

Flat-rate Optimism RPC provider and Optimism RPC node access: free tier, no KYC, HTTP & WebSocket. Optimism mainnet chain ID 10.

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.

Optimism Mainnet RPC URL (HTTP)

Optimism WebSocket RPC URL

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

• Load-balanced across multiple upstream nodes wherever a chain has more than one, with automatic failover
• Health-checked every 2 minutes 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

Optimism RPC methods

Measured weekly through this endpoint: what each method returns on Optimism, its limits, and an example request.

• eth_getLogssupported
• eth_getBlockReceiptssupported
• eth_feeHistorysupported
• eth_getProofsupported
• eth_createAccessListsupported
• debug_traceCallsupported
• trace_blocksupported
• trace_transactionsupported

Optimism guides from the blog

• Best Optimism RPC Providers (2026): Pricing, Free Tiers and Limits ComparedSeven OP Mainnet RPC providers compared on current pricing, free tiers and measured limits, including log caps, tracing and pre-Bedrock history. Pricing checked October 6, 2026.
• Optimism RPC: The Chain That Became a TemplateOptimism (chain ID 10) is both a mature optimistic rollup — 2-second blocks, ETH gas, fault proofs live since 2024 — and the origin of the OP Stack, the codebase behind Base, Zora, opBNB, Unichain, and Soneium. The developer map: what the two-layer fee model means for gas estimation, why traces are uneven there, and how everything you learn on OP Mainnet carries across the family.
• Zora RPC: A 2026 Developer's GuideZora is an OP Stack L2 built for mints, and minting traffic is bursty in a way that punishes public RPC endpoints. Here's what you need to build on Zora in 2026 — chain ID 7777777, Superchain finality, the public-node trap, and the query patterns for reading mints at scale.

Related L2 & rollup chains

Explore RPC endpoints for other L2 & rollup networks on SwiftNodes: