Catch billing problems before invoices exist.
Most billing errors happen before the invoice is ever created. InvoiceGuard is a single API that validates billing details before you create an invoice.
Identify VAT issues, high-risk emails, and domain inconsistencies in one call.
POST /api/v1/validate/invoice
"decision": "block",
"reasons": [
{
"code": "vat.invalid",
"severity": "error",
"message": "VAT number does not match billing country."
}
]
Integration Logic
Your Backend
Prepares billing data
→
InvoiceGuard
Validates context & fields
→
Decision
Allow / Warning / Block
What it checks
- ✓ VAT Numbers: Format and country consistency (VIES/def)
- ✓ Billing Emails: Syntax, MX records, disposable detection
- ✓ Domains: DNS resolution and existence
- ✓ Geo Consistency: IP vs Billing Country vs VAT Country
What it does not do
- × Calculate taxes or rates
- × Validate physical addresses (street level)
- × Verify bank account ownership (IBANs)
- × Replace your accounting software
Decisions, not scores.
allow
No issues found. Proceed.
allow_with_warning
Non-critical issues (e.g. freemail provider).
block
Critical failure (e.g. invalid VAT). stop.
Degraded Mode: If a third-party validator fails, InvoiceGuard fails open (allow) with a degradation warning.
This is for you if...
- You process B2B invoices internationally.
- You are tired of "invalid VAT" support tickets.
- You want to catch fake signups at the billing stage.
- You prefer APIs over dashboards.
This is not for you if...
- You are a strictly B2C local business.
- You need full tax calculation/remittance.
- You utilize a Merchant of Record (Paddle, etc).
Start validating today.
We manually review all trial requests to ensure our product fits your use case.
Request trial access
14-day trial · No credit card required · Real production usage