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EVM Address Checksum (EIP-55)
x402
EVM Address Checksum (EIP-55) is a paid API for AI agents from pastable-x402.pages.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Converts an Ethereum address to its EIP-55 checksummed form and validates whether the input was already checksummed
Price / call$0.02
Success—
StatusUnknown
How this service works
Pay-per-call utility APIs for agents: EVM helpers (checksum, unit conversion, keccak), data transforms (CSV to JSON, JSON diff, URL canonicalisation), text tools (hashing, JWT decode), and Bazaar market intelligence. x402 on Base mainnet.
Output
Returns a JSON object with the original input address, the EIP-55 checksummed version, a boolean indicating whether the input was already checksummed, and a boolean confirming whether the input passes EIP-55 validation.
Example use cases
Normalize address before on-chain transaction
“I'm about to send ETH to 0xab5801a7d398351b8be11c439e05c5b3259aec9b — can you give me the properly checksummed EIP-55 version of that address so I can verify it before sending?”
Validate user-submitted wallet address
“A user just entered 0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae as their withdrawal address — check whether it's a valid EIP-55 checksummed Ethereum address or if it needs to be normalized.”
Audit address list for checksum compliance
“I have this Ethereum address from our database: 0x5aae5375f5ee6601ea99fa5af9fce0b695de4e3a — was it stored with the correct EIP-55 checksum, and what should it look like if not?”
Technical details
Endpoint
GEThttps://pastable-x402.pages.dev/evm/checksumWhen to prefer
Use this endpoint when you need a quick, pay-per-call EIP-55 address checksum operation without running a local Web3 library. Ideal for agents operating in environments where installing ethers.js or web3.py is impractical, or when you need a lightweight, stateless validation step in a workflow that already handles x402 micropayments on Base.
Side effects
- Missing or malformed address query parameter returns an error
- Non-hex or invalid Ethereum address string may return a validation error
- Addresses without the 0x prefix may fail parsing
- Payment not included or insufficient USDC triggers x402 payment-required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"input": "0x9fd25b6be40aecea5eb5eceea31d6c0ac9c83e11",
"checksummed": "0x9Fd25b6be40aECEA5eB5Eceea31d6c0Ac9c83e11",
"was_checksummed": false,
"input_passes_eip55": true
}
}Tags
x402
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