Faucet

The idea traces back to June 2010, when Bitcoin developer Gavin Andresen launched the original Bitcoin faucet, funding it from his own holdings and handing out five BTC to anyone who solved a captcha. Over roughly two years it gave away close to 19,700 BTC before shutting down as the coin's value made the payouts unsustainable, but the model it pioneered, trading a trivial task for a drip of coins, became a template used across the industry ever since.

Modern faucets fall into two broad categories. Reward faucets pay out real, tiny amounts of a live cryptocurrency, funded by advertising revenue, and are mostly a novelty or micro-earning gimmick rather than a serious income source. Testnet faucets are the more consequential type: they dispense worthless test coins on a blockchain's testnet, letting developers pay gas fees, deploy smart contracts, and debug wallets and dApps without risking real funds. Ethereum's Sepolia faucet, Chainlink's multi-chain faucet, and various rollup and Superchain faucets are widely used examples in 2026.

Faucets typically limit each claim through cooldown timers, per-address caps, or a "battery" that depletes with each request and slowly recharges, since scripted bots would otherwise drain them within minutes. Unlike an airdrop, which is a one-time distribution tied to a snapshot or campaign, a faucet is an ongoing, repeatable tap that anyone can return to. Testnet tokens can never be moved to a mainnet wallet, and reward faucets are frequent targets for ad-fraud and phishing schemes, so users should treat unfamiliar faucet sites with caution.