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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, $0.0025/call, status unknown (last checked 2026-09-15).
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$0.0025
Success—
StatusUnknown
How this service works
60 paid endpoints with no metering, no API key and no account. Each endpoint has one flat price per call, whatever the size of the request: LLM completions with automatic failover across several large models, read-only EVM tooling over Base, Ethereum, Polygon, Arbitrum and Optimism, and pure crypto utilities that touch no network.
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
POSThttps://flat-rate-llm.kikoribera03.workers.dev/v1/util/addressWhen 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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