Airdrop Checker API

Check wallet eligibility for active crypto airdrops -- token, value, deadline, claim URL via Etherscan. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "airdrop-checker": {
      "url": "https://airdrop-checker.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl "https://airdrop-checker.api.klymax402.com/api/check?address=0x0000000000000000000000000000000000dEaD"
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
crypto_check_airdrops	GET	/api/check	$0.012	Check wallet eligibility for crypto airdrops
crypto_check_airdrops	POST	/api/check	$0.012	Check wallet eligibility for crypto airdrops (POST variant)

crypto_check_airdrops

Use this when you need to check if a wallet address is eligible for crypto airdrops. Scans wallet interactions against known airdrop contracts and returns eligible claims.

Parameters

Name	Type	Required	Description
address	string	yes	Ethereum wallet address (0x...)

Returns

• eligible -- array of airdrops the wallet qualifies for
• totalEligible -- number of eligible airdrops found
• totalEstimatedValue -- combined estimated USD value of all eligible airdrops
• walletAddress -- the address checked
• checkedAt -- timestamp of the check

Example response:

{"eligible":[{"tokenName":"LayerZero","tokenSymbol":"ZRO","estimatedValueUsd":450,"deadline":"2026-06-30T00:00:00Z","claimUrl":"https://claim.layerzero.network","status":"claimable"}],"totalEligible":3,"totalEstimatedValue":1250,"walletAddress":"0x742d...","checkedAt":"2026-04-13T12:00:00Z"}

When to use: discovering unclaimed airdrops, monitoring multiple wallets for eligibility, or building airdrop farming dashboards.

crypto_check_airdrops

Use this when you need to check if a wallet address is eligible for crypto airdrops. Scans wallet interactions against known airdrop contracts and returns eligible claims. POST variant of crypto_check_airdrops -- same params passed as JSON body instead of query string.

Parameters

Name	Type	Required	Description
address	string	yes	Ethereum wallet address (0x...)

Returns

• eligible -- array of airdrops the wallet qualifies for
• totalEligible -- number of eligible airdrops found
• totalEstimatedValue -- combined estimated USD value of all eligible airdrops
• walletAddress -- the address checked
• checkedAt -- timestamp of the check

Example response:

{"eligible":[{"tokenName":"LayerZero","tokenSymbol":"ZRO","estimatedValueUsd":450,"deadline":"2026-06-30T00:00:00Z","claimUrl":"https://claim.layerzero.network","status":"claimable"}],"totalEligible":3,"totalEstimatedValue":1250,"walletAddress":"0x742d...","checkedAt":"2026-04-13T12:00:00Z"}

When to use: discovering unclaimed airdrops, monitoring multiple wallets for eligibility, or building airdrop farming dashboards.

Example agent prompts

• "Check if a wallet address is eligible for crypto airdrops"
• "Check if a wallet address is eligible for crypto airdrops"

Payment

• Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
• Network: Base L2 (eip155:8453)
• Asset: USDC
• Facilitator: Coinbase CDP (primary), PayAI (fallback)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

• Catalog: https://klymax402.com/llms.txt
• Full API reference: https://klymax402.com/llms-full.txt
• Live stats: https://klymax402.com/stats

License

MIT