Wallet Checksum

$0.002

Convert an Ethereum address to its EIP-55 checksummed form. SIWE messages require the checksummed address on line 2 before signing.

GET https://x402.freeq.one/tools/wallet_checksum

Try it (x402 payment flow)

⚡ Try with your wallet — live payment

curl 'https://x402.freeq.one/tools/wallet_checksum?address=0x90b0dc893406d6ea63bb077ed59f5e8340f98d84'

Without payment, the server returns 402 Payment Required with x402 challenge details. A paying agent signs a USDC transaction on Base and retries with the payment header.

⚡ Live payment playground → Service card OpenAPI spec All APIs