Tax & Government ID Validation Suite
by Info Inlet Inc.
Validate tax and government identifiers worldwide with one API: generic tax IDs, US EIN (validate .
Tax & Government ID Validation Suite — Validate tax and government identifiers worldwide with one API: generic tax IDs, US EIN (validate + format), US ITIN, US SSN, Canadian SIN, Brazilian CPF, and EU VAT numbers. Deterministic check-digit and format rules for KYC and onboarding.
🪪 Rules-based — NOT AI
🚀 Newcomer launch pricing — limited-time introductory rates while we earn our first reviews.
Built for KYC/AML and compliance teams, fintech and HR-tech onboarding, payroll and tax platforms.
Why this exists
Onboarding and payroll need to validate tax and national IDs across countries, but the format and check-digit rules differ per ID and ship from scattered vendors.
What you get
One API key validates tax and government IDs across the US, Canada, Brazil, and the EU with deterministic, reproducible rules — ideal for KYC and onboarding.
Endpoints (9 total)
- POST /v1/tax/validate
- POST /v1/taxid/validate
- POST /v1/ein/validate
- POST /v1/ein/format
- POST /v1/itin/validate
- POST /v1/ssn/validate
- POST /v1/sin/validate
- POST /v1/cpf/validate
- POST /v1/vat/validate
Sample request
curl -X POST https://api-tax-id-suite.knowlez.com/v1/tax/validate -H "X-API-Key: <your-key>" -H "Content-Type: application/json" -d '{}'
Pricing
- Starter — $9/mo · 5,000 ops included · $0.003/op overage
- Pro — $29/mo · 50,000 ops included · $0.002/op overage
- Scale — $99/mo · 500,000 ops included · $0.0008/op overage
Swagger / OpenAPI: api-tax-id-suite.knowlez.com/docs