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Ethereum Address Validator
x402
Ethereum Address Validator is a paid API for AI agents from api.strale.io, paid per call via x402, $0.054/call, status unknown (last checked 2026-09-13).
Validates an Ethereum address for correct 0x-prefixed hex format and EIP-55 mixed-case checksum, returning the canonical checksummed form.
Price / call$0.054
Success—
StatusUnknown
How this service works
Validate an Ethereum address. Checks 0x-prefixed 40-hex format and EIP-55 mixed-case checksum to catch single-character typos. Returns checksummed (canonical) form. Pure algorithmic — fast and cheap.
Output
Returns a JSON object with: whether the address is valid overall, whether the format (0x + 40 hex chars) is correct, whether the EIP-55 mixed-case checksum is valid (or null if no checksum was present), whether a checksum was present at all, whether it is the zero address, and the normalized (EIP-55 checksummed) address string if valid.
Example use cases
Pre-transfer wallet address check
“Before I send ETH to 0xd8da6bf26964af9d7eed9e03e53415d37aa96045, can you verify that address is valid and properly checksummed so I don't lose funds to a typo?”
User-submitted address sanitization
“A user just entered 0xABCDEF1234567890abcdef1234567890ABCDEF12 as their withdrawal address — is it a valid Ethereum address and what's its canonical EIP-55 checksummed form?”
Smart contract recipient validation
“I'm about to write 0x0000000000000000000000000000000000000000 into my contract as a recipient — can you tell me if that's a valid non-zero Ethereum address before I deploy?”
Technical details
Endpoint
POSThttps://api.strale.io/x402/eth-address-validateWhen to prefer
Use this endpoint when you need a fast, cheap, purely algorithmic check of an Ethereum address before any on-chain or off-chain operation — especially to catch single-character typos and EIP-55 checksum errors. Prefer it over on-chain lookups or ENS resolution when you only need format and checksum correctness, not account existence or ENS name resolution.
Side effects
- Missing 'address' field in request body returns validation error
- Non-hex or improperly prefixed strings return format_valid: false with valid: false
- Zero address (0x000...000) returns is_zero_address: true which may be treated as invalid by consuming logic
- Addresses with correct format but wrong EIP-55 checksum return checksum_valid: false
- Network or server errors may return HTTP 5xx responses
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string | Ethereum address (e.g. 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045) |
Tags
x402
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