# EVM Address EIP-55 Checksum Validator

> EVM Address EIP-55 Checksum Validator is a paid API for AI agents from agent-data-tools.revmesh2074.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-26).

Validates an EVM address and returns its EIP-55 checksummed form, classifying the input as lowercase, uppercase, correctly checksummed, or wrong-checksum mixed case.

## Facts

- Endpoint: GET https://agent-data-tools.revmesh2074.workers.dev/evm/checksum?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-26
- Activations on Zero: 0
- Provider: agent-data-tools.revmesh2074.workers.dev
- Website: https://agent-data-tools.revmesh2074.workers.dev
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-data-tools-revmesh2074-workers-dev-evm-address-eip-55-checksum-b7d67d5e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4PDx6Z_k8yOlFsW-tOpjm

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 agent-data-tools-revmesh2074-workers-dev-evm-address-eip-55-checksum-b7d67d5e
```

Example prompt: Before I send ETH to 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045, can you validate and checksum that address to make sure it's correct and hasn't been tampered with?

## When to prefer this

Use this endpoint any time you need to validate or normalize an EVM-compatible address before sending funds, storing it, or displaying it. It works across all EVM chains (Ethereum, Base, Arbitrum, Optimism, Polygon, etc.) and clearly distinguishes between safe inputs (all-lowercase, all-uppercase, correct checksum) and dangerous ones (mixed-case with wrong checksum, indicating a likely copy-paste error or address poisoning attempt). For checking whether an address is a smart contract rather than an EOA, use the chain-specific is_contract endpoint instead.

## Known failure modes

- Address shorter or longer than 40 hex characters after 0x prefix returns invalid
- Non-hex characters in address body return invalid
- Missing 0x prefix may cause a validation error
- Network or worker timeout returns an HTTP error with no result

## How this service works

Address checksum (EIP-55). Validate an EVM address and return its EIP-55 checksummed form, saying whether the input was all lower case, all upper case, correctly checksummed or mixed case with a wrong checksum (a likely typo). Works for every EVM chain. Use before sending funds or storing an address; for whether it is a contract use <chain>_is_contract.

## Output

Returns the original input address, a boolean validity flag, a classification of the input case (all-lowercase, all-uppercase, correctly-checksummed, or mixed-case with wrong checksum), the EIP-55 checksummed form of the address, and a checksumMatches flag indicating whether the input already had the correct checksum.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "examples": [
        "0xd8da6bf26964af9d7eed9e03e53415d37aa96045"
       ],
       "description": "0x address (40 hex characters)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "input": {
       "type": "string"
      },
      "valid": {
       "type": "boolean"
      },
      "inputCase": {
       "type": "string"
      },
      "checksummed": {
       "type": "string"
      },
      "checksumMatches": {}
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "input": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
  "valid": true,
  "inputCase": "lower",
  "checksummed": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "checksumMatches": null
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-data-tools-revmesh2074-workers-dev-evm-address-eip-55-checksum-b7d67d5e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-data-tools.revmesh2074.workers.dev](https://www.zero.xyz/host/agent-data-tools.revmesh2074.workers.dev/llms.txt)