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What Are Crypto Airdrops? A Concise Guide for Builders and Users (2025 Edition)

· 12 min read
Dora Noda
Dora Noda
Software Engineer

TL;DR​

A crypto airdrop is a distribution of tokens to specific wallet addresses—often for free—to bootstrap a network, decentralize ownership, or reward early community members. Popular methods include retroactive rewards for past actions, points-to-token conversions, drops for NFT or token holders, and interactive "quest" campaigns. The devil is in the details: snapshot rules, claim mechanics like Merkle proofs, Sybil resistance, clear communication, and legal compliance are critical for success. For users, the value is tied to tokenomics and safety. For teams, a successful airdrop must align with core product goals, not just generate temporary hype.

What is an airdrop—really?​

At its core, a crypto airdrop is a marketing and distribution strategy where a project sends its native token to the wallets of a specific group of users. This isn't just a giveaway; it’s a calculated move to achieve specific goals. As defined by educational resources from Coinbase and Binance Academy, airdrops are commonly used when a new network, DeFi protocol, or dApp wants to rapidly build a user base. By giving tokens to potential users, projects can incentivize them to participate in governance, provide liquidity, test new features, or simply become active members of the community, kickstarting the network effect.

Where airdrops show up in the wild​

Airdrops come in several flavors, each with a different strategic purpose. Here are the most common models seen in the wild today.

Retroactive (reward past behavior)​

This is the classic model, designed to reward early adopters who used a protocol before it had a token. Uniswap’s 2020 airdrop is the definitive example, setting the modern template by distributing 400UNI400 UNI tokens to every address that had ever interacted with the protocol. It was a powerful "thank you" that turned users into owners overnight.

Points → token (incentives first, token later)​

A dominant trend in 2024 and 2025, the points model gamifies participation. Projects track user actions—like bridging, swapping, or staking—and award off-chain "points." Later, these points are converted into a token allocation. This approach allows teams to measure and incentivize desired behaviors over a longer period before committing to a token launch.

Holder/NFT drops​

This type of airdrop targets users who already hold a specific token or NFT. It’s a way to reward loyalty within an existing ecosystem or to bootstrap a new project with an engaged community. A famous case is ApeCoin, which granted claim rights for its $APE token to Bored Ape and Mutant Ape Yacht Club NFT holders upon its launch in 2022.

Ecosystem/governance programs​

Some projects use a series of airdrops as part of a long-term strategy for decentralization and community growth. Optimism, for example, has conducted multiple airdrops for users, while also reserving a significant portion of its token supply for public goods funding through its RetroPGF program. This demonstrates a commitment to building a sustainable and value-aligned ecosystem.

How an airdrop works (mechanics that matter)​

The difference between a successful airdrop and a chaotic one often comes down to technical and strategic execution. Here are the mechanics that truly matter.

Snapshot & eligibility​

First, a project must decide who qualifies. This involves choosing a snapshot—a specific block height or date—after which user activity will no longer be counted. Eligibility criteria are then defined based on behaviors the project wants to reward, such as bridging funds, executing swaps, providing liquidity, participating in governance, or even contributing code. For its airdrop, Arbitrum collaborated with the analytics firm Nansen to develop a sophisticated distribution model based on a snapshot taken at a specific block on February 6, 2023.

Claim vs. direct send​

While sending tokens directly to wallets seems simpler, most mature projects use a claim-based flow. This prevents tokens from being sent to lost or compromised addresses and requires users to actively engage. The most common pattern is a Merkle Distributor. A project publishes a cryptographic fingerprint (a Merkle root) of the eligible addresses on-chain. Each user can then generate a unique "proof" to verify their eligibility and claim their tokens. This method, popularized by Uniswap’s open-source implementation, is gas-efficient and secure.

Sybil resistance​

Airdrops are a prime target for "farmers"—individuals who use hundreds or thousands of wallets (a "Sybil attack") to maximize their rewards. Teams employ various methods to combat this. These include using analytics to cluster wallets controlled by a single entity, applying heuristics (like wallet age or activity diversity), and, more recently, implementing self-reporting programs. LayerZero’s 2024 campaign introduced a widely discussed model where users were given a chance to self-report Sybil activity for a 15% allocation; those who didn't and were later caught faced exclusion.

Release schedule & governance​

Not all tokens from an airdrop are immediately available. Many projects implement a gradual release schedule (or vesting period) for allocations given to the team, investors, and ecosystem funds. Understanding this schedule is crucial for users to gauge future supply pressure on the market. Platforms like TokenUnlocks provide public dashboards that track these release timelines across hundreds of assets.

Case studies (fast facts)​

  • Uniswap (2020): Distributed 400UNI400 UNI per eligible address, with larger allocations for liquidity providers. It established the claim-based Merkle proof model as the industry standard and demonstrated the power of rewarding a community retroactively.
  • Arbitrum (2023): Launched its L2 governance token, $ARB, with an initial supply of 10 billion. The airdrop used a points system based on on-chain activity before a February 6, 2023 snapshot, incorporating advanced analytics and Sybil filters from Nansen.
  • Starknet (2024): Branded its airdrop as the "Provisions Program," with claims opening on February 20, 2024. It targeted a broad range of contributors, including early users, network developers, and even Ethereum stakers, offering a multi-month window to claim.
  • ZKsync (2024): Announced on June 11, 2024, this was one of the largest Layer 2 user distributions to date. A one-time airdrop distributed 17.5% of the total token supply to nearly 700,000 wallets, rewarding the protocol's early community.

Why teams airdrop (and when they shouldn’t)​

Teams leverage airdrops for several strategic reasons:

  • Kickstart a two-sided network: Airdrops can seed a network with the necessary participants, whether they are liquidity providers, traders, creators, or restakers.
  • Decentralize governance: Distributing tokens to a wide base of active users is a foundational step toward credible decentralization and community-led governance.
  • Reward early contributors: For projects that didn't conduct an ICO or token sale, an airdrop is the primary way to reward the early believers who provided value when the outcome was uncertain.
  • Signal values: An airdrop’s design can communicate a project’s core principles. Optimism's focus on public goods funding is a prime example of this.

However, airdrops are not a silver bullet. Teams should not conduct an airdrop if the product has poor retention, the community is weak, or the token's utility is poorly defined. An airdrop amplifies existing positive feedback loops; it cannot fix a broken product.

For users: how to evaluate and participate—safely​

Airdrops can be lucrative, but they also carry significant risks. Here’s how to navigate the landscape safely.

Before you chase a drop​

  • Check legitimacy: Always verify airdrop announcements through the project’s official channels (website, X account, Discord). Be extremely wary of "claim" links sent via DMs, found in ads, or promoted by unverified accounts.
  • Map the economics: Understand the tokenomics. What is the total supply? What percentage is allocated to users? What is the vesting schedule for insiders? Tools like TokenUnlocks can help you track future supply releases.
  • Know the style: Is it a retroactive drop rewarding past behavior, or a points program that requires ongoing participation? The rules for each are different, and points programs can change their criteria over time.

Wallet hygiene​

  • Use a fresh wallet: When possible, use a dedicated, low-value "burner" wallet for claiming airdrops. This isolates the risk from your main holdings.
  • Read what you sign: Never blindly approve transactions. Malicious sites can trick you into signing permissions that allow them to drain your assets. Use wallet simulators to understand a transaction before signing. Periodically review and revoke stale approvals using tools like Revoke.cash.
  • Be cautious with off-chain signatures: Scammers increasingly abuse Permit and Permit2 signatures, which are off-chain approvals that can be used to move your assets without an on-chain transaction. Be just as careful with these as you are with on-chain approvals.

Common risks​

  • Phishing & drainers: The most common risk is interacting with a fake "claim" site designed to drain your wallet. Research from firms like Scam Sniffer shows that sophisticated drainer kits were responsible for massive losses in 2023–2025.
  • Geofencing & KYC: Some airdrops may have geographic restrictions or require Know Your Customer (KYC) verification. Always read the terms and conditions, as residents of certain countries may be excluded.
  • Taxes (quick orientation, not advice): Tax treatment varies by jurisdiction. In the US, the IRS generally treats airdropped tokens as taxable income at their fair market value on the date you gain control of them. In the UK, HMRC may view an airdrop as income if you performed an action to receive it. Disposing of the tokens later can trigger Capital Gains Tax. Consult a qualified professional.

For teams: a pragmatic airdrop design checklist​

Planning an airdrop? Here’s a checklist to guide your design process.

  1. Clarify the objective: What are you trying to achieve? Reward real usage, decentralize governance, seed liquidity, or fund builders? Define your primary goal and make the target behavior explicit.
  2. Set eligibility that mirrors your product: Design criteria that reward sticky, high-quality users. Weight actions that correlate with retention (e.g., time-weighted balances, consistent trading) over simple volume, and consider capping rewards for whales. Study public post-mortems from major airdrops on platforms like Nansen.
  3. Build in Sybil resistance: Don't rely on a single method. Combine on-chain heuristics (wallet age, activity diversity) with clustering analytics. Consider novel approaches like the community-assisted reporting model pioneered by LayerZero.
  4. Ship a robust claim path: Use a battle-tested Merkle Distributor contract. Publish the full dataset and Merkle tree so that anyone can independently verify the root and their own eligibility. Keep the claim UI minimal, audited, and rate-limited to handle traffic spikes without overwhelming your RPC endpoints.
  5. Communicate the release plan: Be transparent about the total token supply, allocations for different recipient groups (community, team, investors), and future release events. Public dashboards build trust and support healthier market dynamics.
  6. Address governance, legal, and tax: Align the token’s on-chain capabilities (voting, fee sharing, staking) with your long-term roadmap. Seek legal counsel regarding jurisdictional restrictions and necessary disclosures. As the IRS and HMRC guidance shows, details matter.

Quick glossary​

  • Snapshot: A specific block or time used as a cutoff to determine who is eligible for an airdrop.
  • Claim (Merkle): A gas-efficient, proof-based method that allows eligible users to pull their token allocation from a smart contract.
  • Sybil: A scenario where one actor uses many wallets to game a distribution. Teams use filtering techniques to detect and remove them.
  • Points: Off-chain or on-chain tallies that track user engagement. They often convert to tokens later, but the criteria can be subject to change.
  • Release schedule: The timeline detailing how and when non-circulating tokens (e.g., team or investor allocations) enter the market.

Builder’s corner: how BlockEden can help​

Launching an airdrop is a massive undertaking. BlockEden provides the infrastructure to ensure you ship it responsibly and effectively.

  • Reliable snapshots: Use our high-throughput RPC and indexing services to compute eligibility across millions of addresses and complex criteria, on any chain.
  • Claim infra: Get expert guidance on designing and implementing Merkle claim flows and gas-efficient distribution contracts.
  • Sybil ops: Leverage our data pipelines to run heuristics, perform clustering analysis, and iterate on your exclusion list before finalizing your distribution.
  • Launch support: Our infrastructure is built for scale. With built-in rate-limits, automatic retries, and real-time monitoring, you can ensure claim day doesn’t melt your endpoints.

Frequently asked (fast answers)​

Is an airdrop “free money”? No. It’s a distribution tied to specific behaviors, market risks, potential tax liabilities, and security considerations. It's an incentive, not a gift.

Why didn’t I get one? Most likely, you either missed the snapshot date, didn't meet the minimum activity thresholds, or were filtered out by the project's Sybil detection rules. Legitimate projects usually publish their criteria; read them closely.

Should teams leave claims open forever? It varies. Uniswap’s claim contract remains open years later, but many modern projects set a deadline (e.g., 3-6 months) to simplify accounting, recover unclaimed tokens for the treasury, and reduce long-term security maintenance. Choose a policy and document it clearly.

Further reading (primary sources)​