Onboard Verified Sellers. Block Fraud. Automate Compliance.
The all-in-one KYB (Know Your Business) API for marketplaces. Verify Seller Tax IDs, Business Status, and Legal Addresses in real-time across 100+ countries.
Scaling Your Marketplace Creates Compliance Debt
As your platform grows, so does the risk of fraudulent sellers and regulatory fines. Manual verification doesn't scale.
Real-World Impact:
The "Fake Seller" Problem: Fraudsters use fake business details to list counterfeit goods or launder money. The Regulatory Squeeze: New laws like DAC7 (EU) and the INFORM Consumers Act (US) force you to collect and verify seller Tax IDs or face massive fines. Payout Liability: If you pay a seller who provided an invalid 1099 or VAT number, your platform is often on the hook for the unpaid taxes.
Automate Your "Know Your Business" (KYB) Flow
Integrates With: Stripe Connect, Mirakl, Sharetribe, Mangopay
Don't let compliance slow down your Gross Merchandise Value (GMV). Integrate Lookuptax into your seller onboarding flow.
Built for the New Regulatory Landscape
USA: INFORM Consumers Act
Verify high-volume seller Tax IDs to support INFORM compliance requirements
EU: DAC7 Directive
Automatically collect and validate VAT numbers for all EU sellers to meet annual reporting requirements
USA: IRS 1099-K
Validate seller Tax IDs before year-end tax form generation
APIs Built for Platform Scale
Whether you have 100 sellers or 100,000, our infrastructure scales with you.
Bulk Validation Endpoint
Clean your entire existing seller database with CSV or batch API requests
Real-time API
Instant validation during seller onboarding flow
Business Details
Returns registered business name and address where available
Status Verification
Check if Tax ID is active or inactive
Audit Trail
Store validation results as proof of due diligence
Enterprise-Ready KYB API
Built for platforms at scale. Verify thousands of sellers with batch processing and real-time webhooks.
// POST https://api.lookuptax.com/tax/validate
{
"taxId": "GB123456789",
"countryIso": "GB"
}
// RESPONSE
{
"referenceId": "uuid-67890",
"countryIso": "GB",
"tin": "GB123456789",
"validation": {
"overall": {
"isValid": true,
"message": "Tax ID is valid"
},
"format": {
"isValid": true,
"message": "Format is correct"
}
},
"businessEntity": {
"name": "Acme Traders Ltd",
"address": "123 High St, London, UK",
"status": "Active"
}
}
Marketplace FAQs
Can I verify individual freelancers and sole proprietors?
We primarily focus on business Tax IDs. For individual/personal Tax ID validation needs, contact us to discuss your requirements.
What about bulk verification of existing sellers?
Our bulk validation endpoint lets you clean your entire seller database in minutes. Upload a CSV or send batch JSON requests to verify thousands of sellers at once.
What data do you return?
We return the validation status plus business details where available from official sources—including registered business name, address, and active/inactive status.
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