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Agent402 Ethereum Address EIP-55 Checksum Validator
x402
Agent402 Ethereum Address EIP-55 Checksum Validator is a paid API for AI agents from agent402.co.uk, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates and normalizes an Ethereum address to its EIP-55 checksummed form, returning validity status and canonical casing.
Price / call$0.001
Success—
StatusUnknown
How this service works
Don't burn tokens on deterministic work. Go/no-go jobs first: payout preflight, text firewall (PII/secrets), budget check — then rails, calendars, finmath. x402 USDC on Base. UK + global. agent402.co.uk — not agent402.tools. $0.001–$0.002 USDC on Base. No API keys.
Output
Returns a JSON object with a boolean 'valid' field indicating whether the input is a structurally valid Ethereum address, and a 'checksummed' string field containing the EIP-55 mixed-case canonical form of the address (e.g. {"valid": true, "checksummed": "0x9EF92b278a3867C429751390EC427736eB4BABB2"}). Does not check on-chain balance, ENS names, or contract existence.
Example use cases
Pre-transaction address sanity check
“Before I send funds, can you verify that 0x9ef92b278a3867c429751390ec427736eb4babb2 is a valid Ethereum address and give me the properly checksummed version?”
User-submitted wallet address cleanup
“A user just entered 0X9EF92B278A3867C429751390EC427736EB4BABB2 as their payout wallet — can you validate it and normalize it to the correct EIP-55 checksum format?”
Smart contract interaction guard
“I'm about to call a smart contract and I want to make sure 0x9ef92b278a3867C429751390EC427736eB4bAbB2 is a real, correctly checksummed Ethereum address before I proceed.”
Technical details
Endpoint
POSThttps://agent402.co.uk/v1/validate/eth-addressWhen to prefer
Use this endpoint when your agent needs a pure structural and checksum validation of an Ethereum address — with no on-chain lookup, no balance check, and no ENS resolution. It is ideal for input sanitization pipelines, pre-transaction guards, and anywhere you need the canonical EIP-55 mixed-case form of an address cheaply and deterministically at $0.001 per call. Prefer it over on-chain RPC calls when you only need format correctness, not account state.
Side effects
- Malformed address (not 40 hex chars after 0x) returns valid: false
- Non-hex characters in address body cause validation failure
- Missing 0x prefix may cause invalid result
- Address with correct length but invalid hex digits returns valid: false
- Network/payment errors return HTTP 402 or 5xx status
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string | 0x address |
Output
Schema · Response
{
"type": "json",
"example": {
"valid": true,
"checksummed": "0x9EF92b278a3867C429751390EC427736eB4BABB2"
}
}Tags
x402
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