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International Address Formats – Postal Code Validator
x402
International Address Formats – Postal Code Validator is a paid API for AI agents from address-formats.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-02).
Validates a postal code against a country's regex pattern and optionally checks it against a state/province subdivision prefix pattern.
Price / call$0.02
Success—
StatusUnknown
How this service works
Check a postal code against a country's pattern, and a state/province's prefix pattern where the data lists one.
Output
Returns a verdict (valid/invalid), a boolean formatValid flag, the regex pattern used, a normalized version of the postal code, example valid codes for the country, reasons for any failure, and if a subdivision was provided, a subdivisionCheck object showing whether the postal code prefix matches the expected subdivision prefix pattern along with any other subdivisions whose prefix matches.
Example use cases
E-commerce checkout address validation
“Before we process this order, check whether postal code 'SW1A 1AA' is a valid format for the UK (GB) — I want to make sure the customer's address is correctly formatted.”
Canadian province postal prefix check
“Is 'K1A 0B1' a valid Canadian postal code, and does it match the prefix pattern for Ontario (ON)?”
International shipping form validation
“We're shipping to Australia — can you verify that '2000' is a correctly formatted postal code for AU, and tell me which state it likely belongs to?”
Technical details
Endpoint
GEThttps://address-formats.x402tookit.com/postal-code-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to validate that a postal code conforms to a specific country's official format pattern, especially when you also want to cross-check against a state or province prefix. Prefer this over generic regex checks because it uses curated per-country and per-subdivision data, returns normalized forms, and provides human-readable reasons and examples. It is ideal for checkout flows, address form validation, shipping label generation, or any data pipeline that needs to ensure postal code integrity before further processing.
Side effects
- Unsupported or unknown country code returns null pattern or degraded result
- Postal code does not match country pattern — returns formatValid: false with reasons
- Subdivision prefix data not available for some countries — notChecked field populated
- Invalid ISO country code format causes error or empty response
- Network timeout or payment failure before response is returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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