Base Sepolia Faucet: How to Claim Free Testnet ETH
Updated October 22, 2026 · Spectrum Nodes
Short answer: The Spectrum Nodes Base Sepolia faucet sends you 0.1 free testnet 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, in time to test Base's Denim upgrade on Sepolia before mainnet.
What Is the Spectrum Base Sepolia Faucet?
The Base 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. Base Sepolia is the testnet for Base, the Coinbase incubated Ethereum layer 2. Use the ETH to deploy contracts, test dApps and infrastructure, interact with the Base ecosystem and try Base's performance.
Base docs list the Denim upgrade for Base Sepolia on October 21, 2026, with mainnet targeted for November 2026. Denim makes 200 ms blocks canonical and replaces Flashblocks, Base's 200 ms preconfirmations, with canonical block and RPC streams. If your app reads Flashblocks, test the migration on Base Sepolia first.
How Do I Claim Free Base Sepolia ETH?
You need an X account and a wallet address. The claim takes six steps:
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Follow us 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 Base Sepolia Chain ID?
Base Sepolia uses chain ID 84532 (hex 0x14a34). Add it to your wallet or app config with that ID, and check transactions on the sepolia.basescan.org block explorer.
| Network | Chain ID | Hex | Explorer |
|---|---|---|---|
| Base Sepolia | 84532 | 0x14a34 | sepolia.basescan.org |
How Do I Get a Free Base 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 Base 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 Base Sepolia, you can claim test tokens on Ethereum Sepolia, Arbitrum Sepolia, Optimism Sepolia and Monad.
FAQ
What is the Base Sepolia chain ID? The Base Sepolia chain ID is 84532, or 0x14a34 in hex. You can look up transactions on sepolia.basescan.org.
How much ETH does the Base Sepolia faucet give? The Spectrum Nodes faucet gives 0.1 ETH every 24 hours, sent to your Base Sepolia wallet. You can claim again once 24 hours have passed.
Is the Base 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 Base Sepolia ETH? The faucet sends your tokens within seconds of clicking Claim. Your X post has to be live first.
What can I use Base Sepolia ETH for? Use it to pay gas while you deploy contracts and test dApps or infrastructure on Base Sepolia, including changes from the Denim upgrade. Testnet ETH is for testing only and is separate from mainnet ETH.
References
- Base docs, Denim upgrade overview (checked October 21, 2026): https://docs.base.org/upgrades/denim/overview