Frequently Asked Questions

Common questions about our GST Tax Lookup API

General Questions

The Tax Lookup API is an AI-powered REST API that allows developers and businesses to search HSN/SAC codes, navigate hierarchical structures, and retrieve GST tax rates and cess information programmatically.

  • Fuzzy Search: Find HSN/SAC codes even if the input is incomplete or slightly incorrect.
  • Hierarchy Traversal: Explore the parent-child relationships of HSN/SAC codes.
  • GST Tax and Cess Lookup: Access best effort latest GST rates, including updates from the 56th GST Council (effective 22 Sept 2025).
  • Real-Time Data: Ensure your application always uses up-to-date information.
  • Developer-Friendly Tools: Interactive API playground, Swagger, and sample code for easy integration.

You can use the provided Swagger page or API testing tools like Postman, Insomnia etc..

Integration is straightforward:

  1. Sign up on FastGST Console and generate your API key.
  2. Use our REST API endpoints
  3. Refer to our Swagger and documentation for detailed examples.

Pricing and Access

Yes, Please check on Console

Usage limits depend on your subscription plan.

Pricing depends on the plan you choose. Visit the Pricing page on FastGST.in for details on plans, features, and limits.

Data Accuracy and Compliance

We aggregate data from official CBIC and GST Council notifications, combined with automated and manual verification processes. While we strive for accuracy, users should verify all data against official government notifications for statutory compliance.

The API includes the latest GST rates and cess details, including updates from the 56th GST Council (effective 22 Sept 2025).

The API is designed to assist in GST-related workflows, but users are responsible for verifying information against official government sources before filing taxes.

Developer & Technical Questions

The Tax Lookup API is a REST API, so it can be accessed from any language that supports HTTP requests, including Python, JavaScript, Java, PHP, Ruby, and more.

Yes. FastGST.in provides comprehensive API documentation, including Swagger examples, interactive console access, and sample requests/responses to accelerate integration.

Absolutely. We value feedback from developers and businesses. Feature requests help shape our roadmap and improve our API offerings.

Contact our support team via email or through the developer console. We assist with integration, technical queries, and general product guidance.

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