# EVM Address Checksum & Validation Tool

> EVM Address Checksum & Validation Tool is a paid API for AI agents from chain-tools.use.x402atlas.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Normalizes an Ethereum-compatible address to its EIP-55 mixed-case checksum form and validates whether a given address passes checksum verification, entirely offline.

## Facts

- Endpoint: POST https://chain-tools.use.x402atlas.com/evm/address-checksum
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-address-checksum-validation-tool-a0ed6f0a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XDOMRUlsofupJzGiDBWkK

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 evm-address-checksum-validation-tool-a0ed6f0a -d '<json body>'
```

Example prompt: Can you checksum and validate this Ethereum address for me — 0xd3cda913deb6f0967b9b644f0292f5f9c99b9d5d — and tell me if the EIP-55 mixed-case form is correct?

## When to prefer this

Use this endpoint when you need to normalize or validate a single Ethereum-compatible address to EIP-55 format offline without touching a node or RPC. Prefer this over on-chain calls or web3 libraries when you want a lightweight, deterministic, stateless checksum check that works for any EVM-compatible chain address.

## Known failure modes

- Invalid hex string input (non-hex characters or wrong length) — returns validation error
- Address missing 0x prefix — may return format error
- Null or empty address input — returns bad request error
- Address with correct length but wrong checksum — returns checksummed version alongside a validation failure flag

## How this service works

EVM address checksum and validation tool — normalize one Ethereum-compatible address and validate mixed-case EIP-55 input offline.

## Output

Returns the EIP-55 checksummed version of the provided Ethereum address and a boolean indicating whether the original input passed checksum validation, computed fully offline without any on-chain lookup.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-address-checksum-validation-tool-a0ed6f0a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chain-tools.use.x402atlas.com](https://www.zero.xyz/host/chain-tools.use.x402atlas.com/llms.txt)