# Optimism RPC Node  
The Original Optimistic Rollup

Connect to Optimism (OP Mainnet), the pioneering Ethereum Layer 2 and home of the OP Stack. Experience low fees, EVM equivalence, and the growing Superchain ecosystem.

[Documentation](https://docs-rpc.crypto-chief.com/chains/optimism) [Get a free endpoint ](https://auth.crypto-chief.com/registration)

##### 15 M+

Requests per Day

##### 99.9 %

Network Uptime

##### < 100 ms

Average Response Time

##### 24/7

Technical Support

## Specification Optimism Network

Technical characteristics and available endpoints

![Optimism (OP Mainnet)](/img/protocols/optimism.svg)

### Optimism (OP Mainnet)

Mainnet & Testnet Support — OP Sepolia

Chain ID 10

Protocol HTTPS / WSS

Uptime 99.9%

Block Time \~2s

Consensus Optimistic Rollup

EVM Compatible Yes (EVM Equivalent)

Optimism (OP Mainnet) is the original and pioneering Ethereum Layer 2 using optimistic rollup technology. As the creator of the OP Stack — now powering Base, Worldcoin, and dozens of other chains in the Superchain ecosystem — Optimism combines proven technology with a vision for scalable, interoperable blockchains governed by its community.

#### Key capabilities:

- Pioneer of optimistic rollup technology since 2021
- EVM equivalence — identical to Ethereum for developers
- Transaction fees 10-20x lower than Ethereum mainnet
- OP Stack — modular, open-source L2 framework
- Superchain ecosystem — interoperable network of OP chains
- Retroactive Public Goods Funding (RetroPGF)
- Strong DeFi ecosystem with $500M+ TVL
- Governance by OP token holders
- 2-second block time with reliable finality

#### 🔗 RPC Endpoints

HTTPS

`https://rpc.crypto-chief.com/optimism/{YOUR_API_KEY}`

WSS

`wss://rpc.crypto-chief.com/optimism/ws/{YOUR_API_KEY}`

Replace {YOUR\_API\_KEY} with your actual API key from the dashboard.

### Need testnet ETH? Try the Optimism Faucet

Free native testnet ETH and test USDT on **OP Sepolia** — claim instantly from your Crypto Chief dashboard before going to mainnet.

[Open faucet](/faucet/optimism-sepolia/)

## What is an Optimism RPC Node?

Access the original Ethereum Layer 2

An Optimism RPC node provides applications with access to OP Mainnet through an Optimism RPC endpoint or Optimism RPC URL, connecting developers to the pioneering optimistic rollup and foundation of the Superchain ecosystem. Optimism enables low-cost Ethereum transactions while maintaining full EVM equivalence, making it a seamless migration path for Ethereum developers through a reliable Optimism RPC API.

Most infrastructure providers expose an Optimism JSON RPC interface compatible with Ethereum tooling, allowing wallets, dApps, and backend services to interact with OP Mainnet using familiar EVM methods.

### Why Optimism matters

Optimism didn't just create a Layer 2 — it created the OP Stack, a modular framework now powering an ecosystem of interoperable chains including Base (Coinbase), Worldcoin, Zora, and Mode. This vision of the 'Superchain' — multiple L2s sharing security and seamlessly communicating — represents the future of Ethereum scaling.

**Optimism advantages:**

- **EVM equivalence** — identical to Ethereum, zero code changes, with support from any Optimism Web3 provider
- **OP Stack** — powers the Superchain ecosystem
- **Low fees** — 10-20x cheaper than Ethereum mainnet
- **Proven technology** — battle-tested since 2021
- **Strong ecosystem** — major DeFi protocols and dApps
- **RetroPGF** — funds public goods and infrastructure

Many developers start with an Optimism free RPC service for testing and application development before migrating to dedicated infrastructure for production workloads.

### How optimistic rollups work

OP Mainnet RPC infrastructure is built on optimistic rollup technology, where transactions are assumed valid by default (optimistic assumption). Transactions are executed off-chain, bundled, and posted to Ethereum. A 7-day challenge period allows anyone to submit fraud proofs if invalid transactions are detected. This approach achieves massive scalability while inheriting Ethereum's security.

**Optimism architecture:**

1. Users submit transactions to Optimism sequencer
2. Sequencer executes transactions and produces blocks (\~2s)
3. Transaction data batched and posted to Ethereum L1
4. 7-day challenge period for fraud proof verification
5. State finalized on Ethereum after challenge period

### The Superchain vision

The **Superchain** is Optimism's vision for a network of OP Stack chains that share security, bridging, and governance. Chains like Base, Mode, and Zora can seamlessly communicate, share liquidity, and benefit from Ethereum's security — creating a scalable, interoperable blockchain network.

This approach contrasts with isolated L2s, instead building toward a unified, modular ecosystem where chains specialize while remaining interconnected.

## Technical Documentation

Quick start for developers

### Supported RPC Methods

Optimism supports all standard Ethereum JSON-RPC methods with full EVM equivalence:

- **eth\_blockNumber** — current L2 block number
- **eth\_getBalance** — ETH balance on Optimism
- **eth\_call** — execute view functions
- **eth\_sendRawTransaction** — broadcast transactions
- **eth\_getTransactionReceipt** — transaction confirmation
- **eth\_getLogs** — event logs with filters
- **eth\_gasPrice** — current L2 gas price
- **eth\_estimateGas** — gas estimation
- **optimism\_outputAtBlock** — OP-specific output root
- **eth\_subscribe** — WebSocket subscriptions

### Code Examples

💻

#### JavaScript (ethers.js) — Optimism Connection:

```
const { ethers } = require('ethers');

const provider = new ethers.JsonRpcProvider('https://rpc.crypto-chief.com/optimism/YOUR_API_KEY');

// Verify we're on Optimism
const network = await provider.getNetwork();
console.log('Chain ID:', network.chainId); // 10

// Get ETH balance on Optimism
const balance = await provider.getBalance('0x...');
console.log('OP ETH:', ethers.formatEther(balance));

// Interact with Velodrome (major Optimism DEX)
const VELODROME_ROUTER = '0xa062aE8A9c5e11aaA026fc2670B0D65cCc8B2858';
const routerABI = ['function getAmountsOut(uint, address[]) view returns (uint[])'];
const router = new ethers.Contract(VELODROME_ROUTER, routerABI, provider);

// Get price quote
const weth = '0x4200000000000000000000000000000000000006';
const usdc = '0x7F5c764cBc14f9669B88837ca1490cCa17c31607';
const amounts = await router.getAmountsOut(
  ethers.parseEther('1'),
  [weth, usdc]
);
console.log('1 ETH =', Number(amounts[1]) / 1e6, 'USDC');
```

💻

#### Python (web3.py) — Optimism Setup:

```
from web3 import Web3

w3 = Web3(Web3.HTTPProvider('https://rpc.crypto-chief.com/optimism/YOUR_API_KEY'))

print('Connected to Optimism:', w3.is_connected())
print('Chain ID:', w3.eth.chain_id)  # 10
print('Latest block:', w3.eth.block_number)
print('Gas price:', w3.eth.gas_price, 'wei')

# Very low gas on Optimism
gas_gwei = w3.from_wei(w3.eth.gas_price, 'gwei')
print(f'Gas: {gas_gwei} Gwei')
```

💻

#### WebSocket — Real-Time Optimism Updates:

```
const { ethers } = require('ethers');
const provider = new ethers.WebSocketProvider('wss://rpc.crypto-chief.com/optimism/ws/YOUR_API_KEY');

// Monitor new blocks (every ~2s)
provider.on('block', async (blockNumber) => {
  const block = await provider.getBlock(blockNumber);
  console.log(`OP block ${blockNumber}: ${block.transactions.length} txs`);
});

// Monitor OP token transfers
const OP_TOKEN = '0x4200000000000000000000000000000000000042';
const filter = {
  address: OP_TOKEN,
  topics: [ethers.id('Transfer(address,address,uint256)')]
};

provider.on(filter, (log) => {
  console.log('OP transfer:', log);
});
```

### Optimism Best Practices

- **EVM Equivalence:** Deploy Ethereum contracts unchanged
- **Gas Optimization:** L1 data costs are largest component
- **Withdrawals:** 7-day challenge period for L2→L1
- **Predeploys:** Use Optimism predeploys for L1/L2 messaging
- **Superchain:** Consider cross-chain messaging with other OP chains
- **Testing:** Test on OP Sepolia before mainnet

## Why choose us?

Enterprise Optimism infrastructure

### High Performance

Optimized infrastructure delivering &lt;65ms latency with intelligent routing and OP Stack-specific caching strategies.

### Production Grade

Enterprise-grade security with 99.9% uptime, DDoS protection, and redundant architecture for mission-critical applications.

### Comprehensive Analytics

Monitor Optimism-specific metrics including L1 data costs, sequencer activity, and Superchain interactions.

### Global Network

Strategically deployed nodes across continents ensuring low latency for Optimism's global user base.

### Auto-Scaling

Infrastructure automatically scales during high traffic maintaining consistent performance across all conditions.

### OP Stack Experts

24/7 support from engineers with deep Optimism, OP Stack, and Superchain ecosystem expertise.

## Examples of Use

Build on the Superchain foundation

Optimism's proven technology and Superchain vision make it ideal for DeFi protocols, NFT platforms, and applications requiring Ethereum security with Layer 2 economics.

#### DeFi Protocols

Launch DeFi applications on Optimism with established protocols like Velodrome, Aave, and Uniswap. Low fees enable sophisticated strategies and high-frequency operations.

#### NFT Platforms

Build NFT marketplaces and collections on Optimism. Low minting and trading costs make NFTs accessible for creators and collectors alike.

#### Superchain Applications

Develop cross-chain applications leveraging the Superchain ecosystem. Build protocols that seamlessly interact with Base, Mode, Zora, and other OP Stack chains.

#### Wallet Integration

Integrate Optimism into multi-chain wallets. Our infrastructure ensures smooth transaction processing and balance tracking for millions of users.

#### Blockchain Gaming

Create blockchain games on Optimism where low fees enable frequent in-game transactions and asset transfers without prohibitive costs.

#### Bridge & Infrastructure

Build bridges, relayers, and infrastructure services connecting Optimism to other chains. Support the growing Superchain ecosystem.

## Got questions?  
we are here to help

## What is Optimism? 

Optimism (OP Mainnet) is the original Ethereum Layer 2 using optimistic rollup technology. It's the foundation of the OP Stack and Superchain ecosystem.

## What is the OP Stack? 

The OP Stack is Optimism's modular, open-source framework for building Layer 2 chains. It powers Base, Worldcoin, Zora, Mode, and dozens of other chains.

## What is the Superchain? 

The Superchain is a network of OP Stack chains that share security, bridging, and governance — creating an interoperable ecosystem of Layer 2s.

## How much do Optimism transactions cost? 

Optimism transactions typically cost $0.10-$1.00, which is 10-20x cheaper than Ethereum mainnet depending on L1 gas prices.

## Is Optimism EVM compatible? 

Yes, Optimism is EVM-equivalent — identical to Ethereum. Deploy contracts without any code changes using all standard Ethereum tools.

## How long do Optimism withdrawals take? 

Withdrawals from Optimism to Ethereum take 7 days due to the optimistic rollup challenge period. Fast bridges can reduce this for a fee.

## What is the OP token? 

OP is Optimism's governance token used for voting on protocol upgrades and funding public goods through RetroPGF (Retroactive Public Goods Funding).

## How is Optimism different from Arbitrum? 

Both use optimistic rollups, but Optimism pioneered the OP Stack framework and Superchain vision. Arbitrum has larger TVL, while Optimism leads in modularity.

## Do you support OP Sepolia testnet? 

Yes, we provide RPC access to both Optimism mainnet (Chain ID 10) and OP Sepolia testnet for development and testing.

## Can I deploy the same contract on Base and Optimism? 

Yes, both use OP Stack and are EVM-equivalent. The same contract code works on Optimism, Base, and other Superchain networks.

## Pricing that grows with your needs.

### Free

Start building on Web3 — no credit card.

##### $0

- 5 reqs/sec RPC
- 5 reqs/min Unified API
- 1 req/day AML
- Ultimate chains
- WSS, Statistics
- Community support

[Get started ](https://auth.crypto-chief.com/registration)

### Pay for use

Flexible pay-as-you-go for any workload.

##### From $10

- 400 reqs/sec RPC
- 300 reqs/min Unified API
- 5 reqs/sec AML
- EventStream
- Ultimate chains
- WSS, Whitelists, Statistics
- Support portal

[Get started](https://auth.crypto-chief.com/registration)

### Subscription

From $500 monthly plus 20% extra value.

##### From $500

- 400 reqs/sec RPC
- 300 reqs/min Unified API
- 5 reqs/sec AML
- EventStream
- Ultimate chains
- WSS, Whitelists, Statistics
- Support portal

[Get started ](https://auth.crypto-chief.com/registration)

### Enterprise

Tailored solution for expert builders

##### Custom terms

All Subscription features plus:

- Flexible rate limits
- Engineering team support
- Custom SLA
- Personal manager

[Contact Sales ](/contact/)