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Locale Format API – Raw Formatting Rules
x402
Locale Format API – Raw Formatting Rules is a paid API for AI agents from localeformat.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).
Returns CLDR-versioned locale formatting rules (date order, decimal/group separators, currency position, week start) for a given BCP 47 locale tag
Price / call$0.001
Success—
StatusUnknown
How this service works
Verified, CLDR-versioned locale formatting for ~700 locales: currency amounts, numbers, dates and the raw rules — plus a verify endpoint to check your own output. Formatting per CLDR conventions — informational, not legal advice.
Output
A JSON object containing the resolved locale tag and raw CLDR formatting rules: date order (e.g. day-month-year), first day of week (integer, 0=Sunday), decimal separator character, group separator character, and currency position (prefix or suffix).
Example use cases
Localize invoice numbers for Swiss market
“I'm building invoices for Swiss German customers — what decimal separator, grouping separator, and currency position should I use for de-CH?”
Display dates correctly for Japanese users
“What date order and first day of week does CLDR specify for ja-JP so I can format dates correctly for my Japanese users?”
Format currency amounts for Indian English
“Pull the CLDR formatting rules for en-IN, especially where the currency symbol goes and what grouping separator is used, so I can display INR amounts properly.”
Technical details
Endpoint
GEThttps://localeformat.com/v1/rules?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need authoritative, CLDR-versioned raw formatting rules for a specific locale — especially separator characters, date order, week start day, and currency positioning — rather than pre-formatted output strings. It covers ~700 locales and is ideal for building localization logic, validating your own formatting, or bootstrapping i18n configuration for a new market.
Side effects
- Invalid or unrecognized BCP 47 locale tag returns an error or falls back to a parent locale
- Missing required 'locale' query parameter returns a 400 Bad Request
- Unsupported ISO 4217 currency code may return default USD rules
- Payment not completed (402) blocks the response
- Network timeout or service unavailability returns 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"dateOrder": "day-month-year",
"firstDayOfWeek": 1,
"groupSeparator": "’",
"resolvedLocale": "de-CH",
"currencyPosition": "prefix",
"decimalSeparator": "."
}
}Tags
x402
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