KYB API for Fintech
The best KYB API for a fintech is fast to integrate, free to test, and global enough to onboard business customers wherever they are. The Know Your Customer Limited KYB API verifies companies live from official registries across 147 jurisdictions, resolves beneficial ownership, screens for AML, and ships with a free, high-fidelity sandbox and a clonable sample app, so a small team can build and ship business onboarding without a sales call or a multi-vendor stack.
Why does a fintech need a KYB API?
Fintechs that serve businesses (B2B payments, lending, banking-as-a-service, marketplaces, treasury) must verify each business customer before they transact: confirm the company is real and active, identify who owns and controls it, and screen for sanctions and other risk. Building that in-house means integrating registries country by country, tracing ownership, and running screening, which is far beyond what most fintech teams want to maintain. A KYB API gives a small team bank-grade business verification through a few calls, so engineering effort goes into the product, not into registry plumbing.
What does a fintech-friendly KYB API look like?
A fintech-friendly KYB API is:
- Self-serve and free to start: a real sandbox you can build against today, not a sales-gated demo.
- Fast to integrate: clear OAuth2 auth, predictable endpoints, runnable code, and a working sample app.
- Global from one integration: one contract for many jurisdictions, so expansion does not mean a new vendor each time.
- Complete: registry data, UBO, documents, AML, and monitoring together, so you are not stitching vendors.
The Know Your Customer API is built this way: one REST API, one case resource, and a free sandbox pre-loaded with over 980 sample companies and individuals.
How does the Know Your Customer KYB API help fintechs?
| Fintech pain point | How the API addresses it |
|---|---|
| No time or budget for a multi-vendor stack | Registry data, UBO, documents, AML, and monitoring in one API |
| Need to ship onboarding fast | OAuth2, predictable endpoints, 10-minute quickstart, sample app |
| Want to evaluate before paying | Free, high-fidelity sandbox with over 980 sample companies and individuals |
| Expanding into new markets | 147 jurisdictions from one integration, deep APAC and global breadth |
| Complex business ownership | Recursive, multi-level UBO org-chart from live registry data |
| Compliance from day one | Built-in AML screening plus perpetual KYB monitoring |
How do I add KYB to my product fast?
You add KYB in four calls: search for the company, create a case, poll until ready, and read the verified result including ownership. Authentication is the OAuth2 client-credentials grant. You can build the entire flow against the free sandbox, then go to production by changing the base URL and credentials, because the contract is identical. The fastest start is the Quickstart, which gets you a verified company in about ten minutes, and the included sample onboarding app shows the full journey end to end.
Can I start for free?
Yes. The sandbox at https://api.knowyourcustomer.dev is free, high-fidelity, and self-serve through a sign-and-provision access flow. It is pre-loaded with over 980 sample companies and individuals, with configured per-jurisdiction latency profiles that approximate production timing (simulated, not live measurements) and no live registry charges. There is no sales call required to start building. When you are ready, production credentials are issued as part of commercial onboarding.
Frequently asked questions
What is the best KYB API for fintech? One that is free to test, fast to integrate, and global. The Know Your Customer API offers a free sandbox, a 10-minute quickstart, and coverage across 147 jurisdictions.
Is there a free KYB API I can start with? Yes. The high-fidelity sandbox is free and self-serve, with over 980 sample companies and individuals.
How fast can I integrate it? The quickstart gets you a verified company in about ten minutes; a working sample app shows the full onboarding flow.
Does it cover the markets I am expanding into? Coverage spans 147 jurisdictions with deep APAC and global breadth from one integration.
Do I need separate vendors for UBO and AML? No. UBO resolution and AML screening are part of the same company case.