Optimism Sepolia Faucet: How to Claim Free Testnet ETH
Updated October 22, 2026 · Spectrum Nodes
Short answer: The Spectrum Nodes Optimism Sepolia faucet sends you 0.1 free OP Sepolia ETH every 24 hours. Follow @SpectrumNodes on X, publish the prefilled post from the faucet page, then paste the post's URL and your wallet address, agree to the T&C and click Claim. The ETH arrives within seconds, ready to deploy and test contracts before you ship to OP Mainnet.
What Is the Spectrum Optimism Sepolia Faucet?
The Optimism Sepolia faucet is a free Spectrum Nodes service that drips 0.1 ETH every 24 hours to your testnet wallet. A testnet faucet sends test tokens that pay gas on a testnet, so you build without spending mainnet funds. Optimism Sepolia, also called OP Sepolia, is the testnet for OP Mainnet, the Ethereum layer 2 built on the OP Stack. Use the ETH to deploy contracts, test dApps and infrastructure, interact with the Optimism ecosystem and try Optimism's performance.
How Do I Claim Free Optimism Sepolia ETH?
You need an X account and a wallet address. The claim takes six steps:
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Follow Spectrum on X. Follow @SpectrumNodes on X.
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Post the tweet. Click the "Post" button on the faucet page. X opens with a prefilled post, ready to publish from your account.
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Paste your post's URL. Once your X post is live, paste its URL link into the faucet.
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Enter your wallet address. This is where the testnet ETH goes.
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Accept the terms. Confirm that you agree to Spectrum's T&C.
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Click Claim. Your tokens are sent to you within seconds.
What Is the OP Sepolia Chain ID?
OP Sepolia uses chain ID 11155420 (hex 0xaa37dc). Add it to your wallet or app config with that ID, and check transactions on the sepolia-optimism.etherscan.io block explorer.
| Network | Chain ID | Hex | Explorer |
|---|---|---|---|
| OP Sepolia | 11155420 | 0xaa37dc | sepolia-optimism.etherscan.io |
How Do I Get a Free Optimism Sepolia Testnet RPC?
An RPC endpoint is the URL your wallet or app uses to read from a chain and send transactions to it. In the Spectrum dashboard, pick the chain, choose mainnet or testnet and a pruned or archive node, and you get RPC and WebSocket URLs for each region. Spectrum covers 200+ chains, including testnets, and has a Free plan. Not every chain is on the Free tier, so check Optimism Sepolia in the dashboard or on our networks page before you build on it.
Which Other Testnet Faucets Does Spectrum Run?
Spectrum's free tier includes five testnet faucets. Besides Optimism Sepolia, you can claim test tokens on Ethereum Sepolia, Arbitrum Sepolia, Base Sepolia and Monad.
FAQ
What is the OP Sepolia chain ID? The OP Sepolia chain ID is 11155420, or 0xaa37dc in hex. You can look up transactions on sepolia-optimism.etherscan.io.
How much ETH does the Optimism Sepolia faucet give? The Spectrum Nodes faucet gives 0.1 ETH every 24 hours, sent to your OP Sepolia wallet. You can claim again once 24 hours have passed.
Is the OP Sepolia faucet free? Yes, the faucet is free. The only requirement is a social verification step: follow @SpectrumNodes on X and publish the prefilled post.
How long does it take to receive OP Sepolia ETH? The faucet sends your tokens within seconds of clicking Claim. Your X post has to be live first.
What can I use OP Sepolia ETH for? Use it to pay gas while you deploy contracts and test dApps or infrastructure on Optimism Sepolia. Testnet ETH is for testing only and is separate from mainnet ETH.