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

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

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

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