FastGST Tax Lookup API

• API Usage
  • Base URL
  • Legal & Disclaimer
    • Versioning & Specification
    • Disclaimer
    • Data Freshness & Updates
    • Policy Context
  • API Conventions
    • Base URL
    • Authentication
    • Content Types
    • Standard Response Envelope
    • Errors
    • Rate Limits & Fair Use
    • Idempotency & Retries
    • OpenAPI
  • Authentication
    • Step 1: Creating Account
      • Login to Console
    • Step 2: Activating Tax Lookup API
      • Find “Tax Lookup API”
      • Activate “Tax Lookup API”
      • Confirm Your Activation
    • Step 3: Choosing a Plan
      • You Need A Plan
      • Choose a Plan
      • Woohoo!
    • Step 4: Generating API Keys
      • Goto API Keys Section
      • Access Tax Lookup API
  • Endpoints
    • GET /search/hsn
      • Request
      • Query Parameters
      • Curl Example
      • Successful Response
      • Notes
      • Errors
    • GET /search/hsn/{code}
      • Request
      • Path Parameters
      • Curl Example
      • Successful Response
      • Notes
      • Errors
    • GET /search/hsn/{code}/taxes
      • Request
      • Path Parameters
      • Curl Example
      • Successful Response
      • Cess Example
      • Notes
      • Updates & Coverage
      • Errors
    • GET /search/sac
      • Request
      • Query Parameters
      • Curl Example
      • Successful Response
      • Notes
      • Errors
    • GET /search/sac/{code}
      • Request
      • Path Parameters
      • Curl Example
      • Successful Response
      • Notes
      • Errors
    • GET /search/sac/{code}/taxes
      • Request
      • Path Parameters
      • Curl Example
      • Successful Response
      • Notes
      • Errors

Note

FastGST Tax Lookup API v1.0 — OAS 3.0 — OpenAPI JSON: /openapi/v1.json

What is this?

FastGST Tax Lookup API provides a unified, developer-focused gateway for HSN and SAC code search and GST tax information.

Available Endpoints

• HSN: - GET /search/hsn?query={keyword} — Search HSN codes with hierarchical grouping - GET /search/hsn/{code} — Get basic HSN information by exact code - GET /search/hsn/{code}/taxes — Get GST tax rates (CGST, SGST, IGST) for HSN code (Cess rates if applicable)

• SAC: - GET /search/sac?query={keyword} — Search SAC codes with hierarchical grouping - GET /search/sac/{code} — Get basic SAC information by exact code - GET /search/sac/{code}/taxes — Get GST tax rates (CGST, SGST, IGST) for SAC code (Conditions if applicable)

API Features

• Hierarchical search results (top 6 headings with up to 6 sub-items each)

• Separate endpoints for basic code information and tax rates

• Complete GST rate breakdowns including exemption status

• Standardized response format with metadata

Warning

Disclaimer

fastgst.in (“we”, “our”, “the API”) provides GST-related data, including HSN/SAC codes and tax rates, based on publicly available information from the GST Council, CBIC notifications, and other trusted sources. While we strive for accuracy and regularly update our database, occasional discrepancies or delays may occur between official government releases and our updates. By using this API, you acknowledge and agree that: The API is provided “as-is” and without any warranty, express or implied, including but not limited to accuracy, completeness, reliability, or fitness for a particular purpose. Users are solely responsible for verifying all GST-related information and ensuring compliance with applicable laws, regulations, and government notifications. We do not accept any liability for any direct, indirect, incidental, or consequential loss or damage arising from the use of this API or reliance on its content. Use of this API constitutes acceptance of this disclaimer.