# Delx Commerce EIP-55 Address Checksum Validator

> Delx Commerce EIP-55 Address Checksum Validator is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).

Validates whether an EVM (Ethereum) address conforms to EIP-55 mixed-case checksum encoding and returns the correctly checksummed form

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/eip55-check?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-commerce-eip-55-address-checksum-validator-e8fb6a52
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Rtli0T1yaftho7yllANTN

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability delx-commerce-eip-55-address-checksum-validator-e8fb6a52 -d '<json body>'
```

Example prompt: Can you check whether this Ethereum address is properly EIP-55 checksummed: 0x95222290dd7278aa3ddd389cc1e1d165cc4bafe5?

## When to prefer this

Choose this endpoint when an agent needs a lightweight, pay-per-use, no-signup EIP-55 address checksum check with verifiable delivery settled in USDC. Ideal for agents operating in Web3 workflows that need to validate or normalize EVM addresses on-demand without maintaining a subscription or running local keccak256 checksum logic.

## Known failure modes

- Invalid or malformed address string (non-hex characters, wrong length) may return valid: false or an error
- Missing address field in request body causes validation failure
- Address shorter or longer than 40 hex characters may be rejected
- Network or payment processing errors from the x402 micropayment layer

## How this service works

Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.

## Output

Returns a JSON object indicating whether the submitted address is valid EIP-55 checksummed (valid: true/false), the expected correctly checksummed address string, the algorithm used (keccak256), and a schema identifier confirming the response format.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "address": {
   "type": "string",
   "description": "EVM address (40 hex chars, optional 0x)."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "valid": true,
  "schema": "delx/util-eip55-check/v1",
  "expected": "0x95222290DD7278Aa3Ddd389Cc1E1d165CC4BAfe5",
  "algorithm": "keccak256",
  "is_checksummed": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-eip-55-address-checksum-validator-e8fb6a52/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from commerce.delx.ai](https://www.zero.xyz/host/commerce.delx.ai/llms.txt)