API Usage

Learn how to use the Tax Lookup API for different HSN/SAC lookups, Heirarchi Listings, TaxRate and Cessrate Analysis and more

56th GST Council – Updated GST Rates

Access the latest GST rates, including revisions from the 56th GST Council (effective 22 Sept 2025). We strive to provide the most up-to-date data using multiple automated and manual tax notification detection systems, sourced from trusted channels, but always verify against official government notifications for statutory compliance. Note: fastgst.in (“we”, “our”, “the API”) provides this data based on publicly available sources. While we aim for accuracy, occasional discrepancies may occur, and users are responsible for verifying all GST-related information.

API Base URL:

• Base URL

Fair Use & Legal Disclaimer:

• Legal & Disclaimer
• API Conventions

Authentication (API Key Auth):

• Authentication
  • Step 1: Creating Account
  • Step 2: Activating Tax Lookup API
  • Step 3: Choosing a Plan
  • Step 4: Generating API Keys

Endpoints:

• Endpoints
  • GET /search/hsn
  • GET /search/hsn/{code}
  • GET /search/hsn/{code}/taxes
  • GET /search/sac
  • GET /search/sac/{code}
  • GET /search/sac/{code}/taxes