Address Validator X402 MCP Server

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

address_validate

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

Parameters

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.

• Catalog: https://klymax402.com/llms.txt
• Full API reference: https://klymax402.com/llms-full.txt
• Live stats: https://klymax402.com/stats

License

MIT