FAQ

General

What is API4Business? API4Business is a unified API platform for Indian business verification — KYC, GST, bank accounts, company data, and more.

How do I get API credentials? Sign up at developers.api4business.com.

Is there a free tier? Contact sales@api4business.com for pricing details. Sandbox access is available for testing.

Technical

What authentication method do you use? OAuth2 Client Credentials. See Authentication.

What response format do you use? All responses are JSON.

Do you have SDKs? Official SDKs are coming soon. Direct HTTP integration is available with code samples in Python, Node.js, Java, and curl on every endpoint page.

What are the rate limits? Rate limits vary by plan. A 429 response indicates the limit is exceeded. See Rate Limits.

Troubleshooting

I'm getting a 401 error. Your access token has expired. Request a new token using the token endpoint.

I'm getting a 429 error. You've exceeded your rate limit. Implement exponential backoff. See Error Handling.

Bank verification returns an error with HTTP 200. This is expected behavior for some validation errors. Always check the response body. See Bank Verification Error Codes.