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EVM Address Checksum and Validation
x402
EVM Address Checksum and Validation is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-30).
Validates an EVM wallet address and returns it in EIP-55 mixed-case checksum form, flagging invalid or mistyped addresses before funds are sent.
Price / call$0.005
Success—
StatusUnknown
How this service works
Validates an EVM address and returns it in EIP-55 mixed-case checksum form. Catches typos before you send funds: an address that fails the checksum is almost always mistyped.
Output
Returns a JSON object with three fields: 'valid' (boolean indicating whether the address is a well-formed EVM address), 'checksum' (the EIP-55 mixed-case checksummed version of the address), and 'wasChecksummed' (boolean indicating whether the input was already in correct checksum form).
Example use cases
Pre-transfer address safety check
“I'm about to send USDC to 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 — can you validate it and give me back the properly checksummed version so I know it's not mistyped?”
Smart contract integration QA
“Our deployment script is about to interact with 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9b — please verify that address is valid and return it in EIP-55 checksum format.”
User-submitted wallet validation
“A user just entered 0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae as their withdrawal address — is it a valid EVM address, and what does the checksum form look like?”
Technical details
Endpoint
GEThttps://flat-rate-llm.kikoribera03.workers.dev/v1/util/address?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, instant check of an EVM address before executing any on-chain transaction or storing a wallet address. It is ideal for pre-flight validation in payment workflows, user onboarding, or smart contract interactions where a mistyped address would result in permanent fund loss. Prefer it over manual regex checks because it enforces EIP-55 checksum rules, not just hex format.
Side effects
- Address is not a valid hex string or wrong length — 'valid' will be false and checksum may be empty
- Address contains invalid characters — returns valid: false
- Missing required 'address' query parameter — likely returns a 400 error
- Network or worker timeout — transient 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| addressrequired | string | The address to validate, in any case. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| valid | boolean | |
| checksum | string | |
| wasChecksummed | boolean |
Tags
x402
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