# Aurenic EIP-55 Ethereum Address Checksum Validator

> Aurenic EIP-55 Ethereum Address Checksum Validator is a paid API for AI agents from api.aurenic.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-30).

Validates whether an Ethereum address conforms to the EIP-55 mixed-case checksum encoding standard

## Facts

- Endpoint: GET https://api.aurenic.org/eth-validate/:address?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aurenic-eip-55-ethereum-address-checksum-validator-c401e27d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rLUdDKe8efn5ZJWG79qGn

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 aurenic-eip-55-ethereum-address-checksum-validator-c401e27d
```

Example prompt: Can you check whether 0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed is a valid EIP-55 checksummed Ethereum address?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call EIP-55 checksum verification for Ethereum addresses without spinning up a full Web3 library or node connection. Ideal for serverless agents, form validation pipelines, or pre-transaction safety checks where you want a fast, cheap external oracle to confirm address integrity. Prefer over local library calls when you want a stateless microservice approach or when running in environments where Web3 dependencies are unavailable.

## Known failure modes

- Address missing 0x prefix — may return invalid or error
- Non-hex characters in address body — validation error
- Address wrong length (not 42 characters) — rejected
- All-lowercase or all-uppercase address — fails EIP-55 checksum even if the address itself is real
- Network or service unavailability — HTTP 5xx response
- Payment failure — HTTP 402 if USDC payment is not provided

## How this service works

EIP-55 checksum validation for an Ethereum address

## Output

Returns whether the provided Ethereum address passes EIP-55 checksum validation — indicating if the mixed-case encoding of the hex characters is cryptographically correct per the standard, helping detect corrupted or incorrectly formatted addresses.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aurenic-eip-55-ethereum-address-checksum-validator-c401e27d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.aurenic.org](https://www.zero.xyz/host/api.aurenic.org/llms.txt)