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Format Address API – Country Formatting Rules
x402
Format Address API – Country Formatting Rules is a paid API for AI agents from formataddress.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns per-country postal address format rules, field order, postal code patterns, and subdivision metadata for a given ISO 3166-1 alpha-2 country code.
Price / call$0.001
Success—
StatusUnknown
How this service works
Verified postal address formatting for 252 countries based on Google's libaddressinput metadata: per-country format rules, address-block composition, verification of your own output, and subdivision lists. Address formatting per Google's libaddressinput metadata — informational, not legal or postal advice.
Output
A JSON object containing the address template string (using format tokens like %N, %O, %A, %Z, %C), an ordered list of address fields, which fields are required, a postal code regex pattern and example, the country name, and optionally subdivision data — everything needed to render or validate an address form for that country.
Example use cases
E-commerce checkout address validation
“I'm building a checkout form and need to know which address fields are required and in what order for Germany — can you pull the official formatting rules including the postal code pattern?”
Localized address block for shipping label
“I need to print a shipping label for a package going to South Korea — can you get me the correct address format template in Latin script so I know how to arrange the recipient's name, street, city, and postal code?”
CRM address field configuration by country
“We're setting up our CRM to collect addresses from customers in Brazil — what fields are required, what's the correct field order, and what should the postal code look like?”
Technical details
Endpoint
GEThttps://formataddress.com/v1/rulesWhen to prefer
Choose this endpoint when you need authoritative, per-country postal address formatting rules derived from Google's libaddressinput metadata — particularly when building address forms, validating address output, printing shipping labels, or configuring CRM/ERP systems for international use. Prefer this over generic address validation APIs when you specifically need format templates, required-field lists, field ordering, and postal code patterns rather than geocoding or address correction.
Side effects
- Missing or invalid country code returns an error
- Unsupported country code (outside 252 supported) may return empty or error response
- Invalid subdivision code may be ignored or return an error
- Requesting latin script for a country without a romanized format may fall back to local format
- Network or payment failure (HTTP 402 if USDC payment not processed)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"required": [
"streetAddress",
"city",
"postalCode"
],
"template": "%N%n%O%n%A%n%Z %C",
"fieldOrder": [
"name",
"organization",
"streetAddress",
"postalCode",
"city"
],
"postalCode": {
"example": "26133",
"pattern": "\\d{5}"
},
"countryName": "GERMANY"
}
}Tags
x402
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