# x402-gateway: Wallet Checksum Validator

> x402-gateway: Wallet Checksum Validator is a paid API for AI agents from x402.freeq.one, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Validates the checksum of a cryptocurrency wallet address to confirm it is correctly formatted and legitimate

## Facts

- Endpoint: POST https://x402.freeq.one/market/agoragentic/tools/wallet_checksum?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-gateway-wallet-checksum-validator-b71a46c9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_S30YSDRcsvjBMGvQ3x1hX

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 x402-gateway-wallet-checksum-validator-b71a46c9 -d '<json body>'
```

Example prompt: Can you verify whether this wallet address has a valid checksum: 0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call checksum validation for crypto wallet addresses without setting up an account or API key. Ideal for AI agents that need to verify wallet address integrity before executing transactions, particularly in automated workflows where address correctness is critical. Prefer this over full KYC or on-chain verification tools when you only need format and checksum validation.

## Known failure modes

- Invalid or malformed address format returns a validation failure or error response
- Missing tool parameter in request body causes a 400 bad request
- Payment not processed correctly causes a 402 payment required response
- Network timeout or upstream provider unavailability causes a 5xx error
- Non-hexadecimal or non-wallet string input may return an explicit invalid format error

## How this service works

x402-gateway tool: wallet_checksum (market: agoragentic)

## Output

A validation result indicating whether the provided wallet address passes the EIP-55 checksum standard or equivalent blockchain address integrity check, confirming if it is correctly formatted and safe to use for transactions.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "tool": {
   "type": "string",
   "description": "Tool name (see GET /tools for the catalog)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-gateway-wallet-checksum-validator-b71a46c9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.freeq.one](https://www.zero.xyz/host/x402.freeq.one/llms.txt)