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.):

json

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

Quickstart -- HTTP (x402)

bash

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:

json

{"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:

json

{"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"}