Locale Format API – Verify Endpoint

x402

Locale Format API – Verify Endpoint is a paid API for AI agents from localeformat.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-11).

Validates a pre-formatted locale string (currency, number, or datetime) against CLDR rules, returning whether it is correct and explaining any differences

Price / call$0.001

Seller volume →—

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

Returns a JSON object with: a boolean `valid` field indicating correctness, the `expected` CLDR-correct string, an array of `differences` describing specific formatting errors (e.g. wrong symbol position, wrong separator), and a `resolvedLocale` confirming which locale was applied.

Example use cases

Validating invoice currency display

“I'm generating invoices for German customers and I want to make sure '1.234,56 €' is the correct CLDR way to display 1234.56 EUR for the de-DE locale — can you verify it and list any mistakes?”

Catching number format bugs before release

“Before we ship our app, can you check whether '1,23,456.78' is a valid CLDR-formatted number for the en-IN locale and explain any differences from what's expected?”

Debugging datetime formatting for Japanese users

“Can you verify that '2024年01月15日' is the correctly CLDR-formatted datetime for the ja-JP locale using ISO date 2024-01-15, and tell me if anything is off?”

Technical details

Endpoint

GEThttps://localeformat.com/v1/verify?utm_source=zero.xyz

When to prefer

Use this endpoint when you have already produced a formatted locale string and need to validate it against authoritative CLDR rules before displaying or transmitting it — particularly useful in QA pipelines, pre-release checks, or agent loops where formatting correctness must be confirmed. Prefer this over formatting endpoints when the string already exists and you need a diff/diagnosis rather than a fresh format.

Side effects

Missing required query parameters (type, formatted, locale) → 400 Bad Request
Invalid or unrecognized BCP 47 locale tag → error or fallback to a resolved locale
Unsupported format type value → validation error
Malformed or non-numeric value for currency/number types → error
Payment failure via x402 protocol → 402 Payment Required

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "valid": false,
    "expected": "1.234,56 €",
    "differences": [
      "currency symbol on the wrong side (locale uses suffix)"
    ],
    "resolvedLocale": "de-DE"
  }
}

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