Beyond simply giving away free coins, an airdrop is typically how a project solves two problems at once: spreading its token more widely than a private sale ever could, and rewarding the people already using its protocol. Teams often take a snapshot of on-chain activity, such as wallet balances, transaction history, or interaction with a testnet, then calculate an allocation for every address that meets a published cutoff date and set of criteria.
Claiming usually means connecting a wallet to an official site and signing a transaction, sometimes after paying a small gas fee or making a token donation to unlock the full amount. Because free tokens attract abuse, most projects now run anti-sybil checks before distribution. LayerZero's 2024 ZRO airdrop remains the largest documented example: out of roughly 2.08 million snapshotted wallets, its team and outside analytics firms flagged over 800,000 as sybil clusters, offering a short self-report window with a reduced payout instead of outright disqualification. Similar filtering is now standard across Ethereum and its layer-2 ecosystems.
Airdrop hunting carries real costs. Gas fees and time across dozens of protocols come with no guarantee a token ever launches, wallets can be flagged and excluded without appeal, and there is tax exposure: many jurisdictions treat received tokens as ordinary income at their market value once a recipient can freely transfer them, even if the price later collapses. Fake airdrops requesting a private key or a malicious wallet signature are also a common phishing vector, and a project that disappoints its community after launch can quickly get relabeled a rektdrop.