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Postal Code Validator
x402
Postal Code Validator is a paid API for AI agents from postal.openverbs.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Validates whether a postal/ZIP code is well-formed for a given country using ISO 3166-1 alpha-2 country codes
Price / call$0.002
Success—
StatusUnknown
How this service works
Check whether a postal / ZIP code is well-formed for a country (ISO 3166-1 alpha-2). A malformed code is a successful result with `valid:false`, not an error — only an unsupported country or empty code is a 400.
Output
Returns a JSON object indicating whether the provided postal/ZIP code is valid for the given country. A malformed code returns a successful response with valid:false rather than an error. Only unsupported country codes or empty inputs trigger a 400 error.
Example use cases
E-commerce checkout address validation
“Before we complete the order, can you check whether 'SW1A 1AA' is a valid postcode for GB so I know the shipping address is well-formed?”
User registration form pre-validation
“A new user entered 'H0H 0H0' as their postal code for Canada — is that actually a valid Canadian postal code format?”
Bulk address data quality check
“I need to verify if '75008' is a properly formatted postal code for France before I import it into our CRM.”
Technical details
Endpoint
POSThttps://postal.openverbs.com/v1/validateWhen to prefer
Use this endpoint when you need a quick, lightweight format check on a postal or ZIP code before processing an address — ideal for e-commerce checkout flows, form validation, or data quality pipelines. Prefer this over full address validation services when you only need to confirm the code's structure, not its real-world existence or deliverability. Especially useful when you have the country code handy and want a binary valid/invalid result cheaply at $0.002 per call.
Side effects
- 400 error if the country code is unsupported or not recognized
- 400 error if the postal code field is empty
- Returns valid:false (not an error) for malformed but syntactically processable codes
- May not reflect recent postal code changes if the underlying pattern database is outdated
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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