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Format Address API — Verify
x402
Format Address API — Verify 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).
Validates and formats a postal address block against Google's libaddressinput rules for a given country, returning whether the address is valid and what problems were found.
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 with a 'valid' boolean indicating whether the address block is correct, an 'expected' string showing the properly formatted address block (newline-separated), and a 'problems' array listing specific formatting issues found (e.g. missing lines, wrong order, incorrect postal code placement).
Example use cases
Validate shipping address before checkout
“Before we finalize this order, can you verify that the address 'Tanaka Ichiro, 1-1 Shinjuku, Shinjuku-ku, Tokyo 160-0022' is correctly formatted for Japan (JP) and flag any issues?”
Check US address formatting for a CRM record
“I've got a US address in our CRM — '123 Main St, Springfield, IL 62701' — can you validate it against the correct US postal format and let me know if anything looks wrong?”
Format Brazilian address in latin script
“I need to send a package to Brazil and want to make sure the address block 'Rua das Flores 45, São Paulo SP 01310-100' is correctly formatted — can you verify it using country code BR?”
Technical details
Endpoint
GEThttps://formataddress.com/v1/verifyWhen to prefer
Choose this endpoint when you need country-aware postal address validation backed by Google's libaddressinput metadata covering 252 countries, particularly when you want both formatting correction and explicit problem identification. Prefer it over generic address validators when you need per-country format rules (field order, required fields, subdivision formats) or when you need to verify an already-composed address block rather than just parse or geocode an address. Not suitable when you need geocoding, coordinate lookup, or legally certified postal verification.
Side effects
- Missing required 'country' query parameter — returns an error
- Invalid ISO 3166-1 alpha-2 country code — returns an error or unrecognized country response
- Malformed or empty formatted address block when using verification mode — may return all lines as problems
- Unsupported script value — defaults to local script
- Network timeout or service unavailability — HTTP 5xx error
- Payment not provided or rejected — HTTP 402 response requiring x402 payment
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"valid": false,
"expected": "Max Muster\nMusterstr. 1\n53225 BONN",
"problems": [
"expected line '53225 BONN' not found in formatted block"
]
}
}Tags
x402
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