FastX402 Postal Code Validator

x402

FastX402 Postal Code Validator is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.001/call, status down (last checked 2026-10-23).

Validates a postal code for a given country and returns whether it is valid, its normalized form, and the expected format.

Price / call$0.001

Seller volume →—

Success—

StatusDown

How this service works

216 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.

Output

Returns a JSON object with the submitted postal code, a boolean indicating whether it is valid, the normalized version of the postal code, the expected format pattern for that country, and the country code.

Example use cases

Validate customer shipping address zip code

“Before I process this order, can you check whether 'SW1A 1AA' is a valid postal code in the UK?”

Form input validation for international checkout

“A user entered 'H3Z 2Y7' as their postal code with country CA — is that a valid Canadian postal code and what's the expected format?”

Verify postal code before geocoding

“I need to geocode an address in Germany — first check if '10115' is a valid German postal code so I know the address is properly formed.”

Technical details

Endpoint

GEThttps://fastx402.tools/postal-code-validate?utm_source=zero.xyz

When to prefer

Use this endpoint when you need a lightweight, pay-per-call postal code validation without setting up an account or API key. Ideal for agents that occasionally need to verify shipping addresses or user-entered postal codes across multiple countries at minimal cost ($0.001 per call).

Side effects

Invalid or unsupported country code returns a validation failure or error
Postal code with incorrect characters for the country returns valid:false
Missing required query parameters (code or country) result in a 400-level error
Payment failure via x402 protocol blocks the request before processing

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "code": "12345-6789",
    "valid": true,
    "format": "##### or #####-####",
    "country": "US",
    "normalized": "12345-6789"
  }
}

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