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Ethereum EIP-55 Address Checksum Validator
x402
Ethereum EIP-55 Address Checksum Validator is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Validates and computes the EIP-55 mixed-case checksum for an Ethereum address, ensuring correctness and catching typos.
Price / call$0.003
Success—
StatusUnknown
How this service works
Validate and compute the EIP-55 checksum of an Ethereum address - precise mixed-case checksum that catches typos, which LLMs cannot reliably produce. checksum address, eip55, address validation, ethereum checksum, validate address, address checksum
Output
Returns the EIP-55 checksummed version of the input Ethereum address (correct mixed-case hex string) along with a validity status indicating whether the original input was already correctly checksummed or needed correction.
Example use cases
Example prompt
“Can you validate and return the proper EIP-55 checksummed version of this Ethereum address: 0xd8da6bf26964af9d7eed9e03e53415d37aa96045?”
Technical details
Endpoint
GEThttps://api.x402node.dev/crypto/address-checksumWhen to prefer
Use this endpoint when you need to programmatically verify or normalize an Ethereum address to its EIP-55 mixed-case checksum before storing, displaying, or transacting — especially important since LLMs cannot reliably produce correct EIP-55 checksums on their own. Prefer this over manual string manipulation or LLM-generated checksums whenever address integrity matters.
Side effects
- Invalid hex string — returns error if input is not a valid Ethereum address format
- Missing address parameter — returns 400 if no address is supplied
- Non-Ethereum address formats (e.g. Bitcoin, Solana) — not applicable and will return an error
- Address with invalid length — must be 40 hex characters (plus optional 0x prefix)
Input
{
"address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"note": "EIP-55 checksum. Use checksumAddress for safe display. inputWasCorrectChecksum=false means the input had wrong casing.",
"_hint": "x402 paid endpoints for AI agents — x402node.dev (utilities) · cn402.com (Chinese culture)",
"input": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
"source": "viem",
"isValid": true,
"lowercase": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
"checksumAddress": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"inputWasCorrectChecksum": false
}Tags
x402
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