Mainnet
Mainnet JSON-RPC
https://optimism-mainnet.gateway.tatum.io
Free Optimism RPC (ETH)
Explore Optimism, a Layer 2 scaling solution for Ethereum. Build fast and low-cost decentralized applications using its RPC gateway.
99.99%
2
24/7
FREE
RPC Gateway
Connect to Optimism RPC
Access reliable, enterprise-grade RPC endpoints that power your dApp with ultra-low latency and 99.9% uptime.
Connect to Optimism Gateway
Make your first RPC call on Optimism's Blockchain Gateway.
Ready for production?
Get 200 requests/second, priority support and advanced blockchain features.
Global Load Balancer
Route to nearest node
Batch RPC Calls
Multiple requests at once
Archive Nodes
Historical blockchain data
Debug & Trace
Advanced debugging
Advanced Analytics
Usage & performance
Bring Your Own RPC
Custom RPC gateways
Get Free API Key
Increase your limit and access all Optimism features in Tatum Development Platform.
Estimate Gas on Optimism
Calculate the optimal gas fee for any transaction on Optimism.
Smart Contract Tools on Optimism
Deploy, create, and interact with smart contracts on Optimism.
Accessible to Everyone
No signup. No paywalls. Just RPC that works. Great ideas come from everywhere.
Our Mission
With love by Tatum
Blockchain Data
Indexed Optimism Data Insights
Complete on-chain data access for Optimism. Query wallets, tokens, NFTs, and transaction history with lightning-fast APIs - no need to run your own nodes.
Get Wallet Portfolio
Fetch all token balances for a wallet on Optimism.
Get Token Exchange Rates
Check exchange rates for tokens and fiat on Optimism.
1 ETH=? USDCheck Optimism Malicious Address
Verify if an address on Optimism is flagged as malicious.
0x1a2b...3c4d
Flagged
NFT API on Optimism
Query collections, get metadata, check ownership, and track balances on Optimism.
Get Token Information
Fetch detailed information about a token on Optimism.
Get Optimism Wallet Transactions
Retrieve all Optimism transactions for a wallet, including internal transfers.
Blockchain Notifications
Real-time Optimism Alerts
Real-time webhooks for Optimism events. Stop polling the blockchain - get instant alerts for transactions, smart contract events, and wallet activities.
About Optimism
The Optimism RPC documentation provides developers with a comprehensive guide to interact with Optimism, a Layer 2 scaling solution for Ethereum. Optimism uses optimistic rollups to achieve low-cost and fast transactions while maintaining the security of the Ethereum mainnet. The documentation includes key API endpoints for querying blockchain data, managing transactions, and interacting with smart contracts. Developers can build scalable decentralized applications (dApps) with enhanced performance and lower transaction costs using Optimism’s RPC gateway.
Tatum Blog & Updates
Learn More About Optimism
Discover guides, tutorials, and insights about Optimism development
What's new at Tatum on Optimism?
Jul 7, 2025 Added
Data: Arbitrum & Optimism - Wallets, Tokens, Transactions
We’re excited to announce that both Arbitrum and Optimism, two leading Ethereum Layer 2 networks, are now live on Tat...
Nov 12, 2024 Added
Virtual Accounts: Added chains & search filters
We’re excited to announce the addition of three new blockchain networks to our Virtual Accounts:
FAQ
Frequently Asked Questions
Everything you need to know about Optimism RPC endpoints
Quick Answer: What is Optimism RPC?
Optimism RPC (Remote Procedure Call) is an interface that allows developers to interact with the Optimism blockchain. It enables you to read data, send transactions, and deploy smart contracts programmatically using standard JSON-RPC methods. Our free tier provides 5 requests per minute with no registration required, perfect for testing and development. For production applications, upgrade to Tatum Premium for 200 requests per second and enterprise-grade reliability.
What is Optimism RPC?
Optimism RPC (Remote Procedure Call) is an interface that allows developers to interact with the Optimism blockchain. It enables you to read data, send transactions, and deploy smart contracts programmatically using standard JSON-RPC methods.
How do I connect to Optimism using these RPC endpoints?
Simply copy the RPC endpoint URL from above and configure it in your Web3 library (ethers.js, web3.js), wallet (MetaMask, Trust Wallet), or development tool (Hardhat, Truffle). The endpoint works immediately with no registration required for the free tier.
What are the rate limits for free Optimism RPC?
Free tier RPC endpoints are limited to 5 requests per minute. This is perfect for testing and development. For production applications, we recommend upgrading to Tatum Premium which offers 200 requests per second with no daily limits.
Is Optimism RPC free forever?
Yes! Our free tier Optimism RPC endpoints are free forever with 5 requests per minute. This tier is perfect for learning, testing, and small projects. There are no hidden fees or time limits on the free tier.
What happens if I exceed the free tier rate limit for Optimism RPC?
If you exceed 5 requests per minute on the free tier Optimism RPC, you'll receive an HTTP 429 (Too Many Requests) error. This is a standard rate limiting response. To avoid this, you can upgrade to Tatum Premium which offers 200 requests per second with no daily limits, perfect for production applications.
Can I use these Optimism RPC endpoints with MetaMask?
Yes! You can configure MetaMask to use our Optimism RPC endpoints. Simply copy the endpoint URL from above, go to MetaMask Settings > Networks > Add Network (or edit existing), and paste the RPC URL. This works with all EVM-compatible blockchains including Optimism.
Are the Optimism RPC endpoints secure?
Yes, all our Optimism RPC endpoints use HTTPS encryption and follow enterprise-grade security practices. They're powered by Tatum's infrastructure which maintains 99.99% uptime and is trusted by thousands of developers worldwide.
What's the difference between Optimism mainnet and testnet RPC endpoints?
Mainnet endpoints connect to the live Optimism blockchain where real transactions occur with real assets. Testnet endpoints connect to a separate testing network with free test tokens. Always test your dApp on Optimism testnet before deploying to mainnet.
How do I troubleshoot Optimism RPC connection errors?
If you're experiencing connection errors with Optimism RPC, check: 1) The RPC endpoint URL is correct, 2) You're not exceeding rate limits (5 req/min for free tier), 3) Your network allows HTTPS connections, 4) The Optimism network is currently operational. For persistent issues, check our status page or contact support.
What's the difference between mainnet and testnet?
Mainnet is the live Optimism blockchain where real transactions occur with real assets. Testnet is a separate network used for testing and development with free test tokens. Always test your dApp on testnet before deploying to mainnet.
Can I use these endpoints in production?
Free tier endpoints can be used in production for low-traffic applications (under 5 req/min). For production apps with higher traffic, we strongly recommend Tatum Premium for guaranteed uptime, faster rate limits, and enterprise SLA.
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