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Address Validator API

Official registry Security

Parse, validate and normalize postal addresses. Detect country, verify format. x402.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (sse)
Claude Code 
claude mcp add --transport sse address-validator-api 'https://address-validator.api.klymax402.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "address-validator-api": {
            "type": "sse",
            "url": "https://address-validator.api.klymax402.com/mcp"
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Address Validator API
  2. Quickstart -- MCP
  3. Quickstart -- HTTP (x402)
  4. Tools
  5. Example agent prompts
  6. Payment
  7. Part of klymax402
  8. License

Address Validator API

Parse and validate postal addresses -- country detection, component split, postal code verification. US/UK/FR/DE. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

{
  "mcpServers": {
    "address-validator": {
      "url": "https://address-validator.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl -X POST "https://address-validator.api.klymax402.com/api/validate" \
  -H "Content-Type: application/json" \
  -d '{"address":"0x0000000000000000000000000000000000dEaD"}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

ToolMethodPathPriceDescription
address_validatePOST/api/validate$0.008Parse, validate, and normalize a postal address
address_validate

Use this when you need to parse, validate, or normalize a postal address. Returns structured address components in JSON.

Parameters

NameTypeRequiredDescription
addressstringyesFull address string to parse and validate (e.g. '123 Main St, New York, NY 10001')

Example response:

{"address":"123 Main St, New York, NY 10001","valid":true,"components":{"street":"123 Main St","city":"New York","state":"NY","postalCode":"10001","country":"United States"},"normalizedAddress":"123 Main St, New York, NY 10001, US","detectedCountry":"United States","postalCodeValid":true,"confidence":0.95}

When to use: CRM data cleaning, e-commerce checkout validation, shipping address normalization, and KYC address verification.

Not for: phone validation (use phone_validate_number), email validation (use email_verify_address), PII detection in text (use compliance_detect_pii).

Example agent prompts

  • "Parse, validate, or normalize a postal address"

Payment

  • Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
  • Network: Base L2 (eip155:8453)
  • Asset: USDC
  • Facilitator: Coinbase CDP (primary), PayAI (fallback)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

License

MIT

Frequently asked questions

What is Address Validator API?

Parse, validate and normalize postal addresses. Detect country, verify format. x402.

How do I install Address Validator API?

It runs as a remote server. In Claude Code: claude mcp add --transport sse address-validator-api 'https://address-validator.api.klymax402.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Address Validator API need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Address Validator API open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Address Validator API?

It is published by Br0ski777. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.