GST Public API: Empowering Taxpayers with Real-Time Compliance and Data Accuracy

Public API
A Public API allows you to fetch (GET) basic details of a taxpayer without requiring any confirmation or consent. This information is made available by the GSTN (Goods and Services Tax Network) through registered GSPs (GST Suvidha Providers).

Private API
A Private API provides detailed taxpayer information and allows both GET and POST operations to GSTN.  Access to these APIs requires the taxpayer’s consent, which is enabled from their GST portal. The connection is authenticated using an OTP (valid for 30 days) generated from the taxpayer’s GSTIN account.

Comparison: Public API vs Private API

Why Your Company Needs Automated Compliance
Managing Goods and Services Tax (GST) compliance manually has grown to be a significant burden for businesses of all sizes in the changing business climate of today. Spreadsheets and portal uploads, which once looked doable, are now becoming a time-consuming and error-prone process that reduces productivity and revenues.
From frequent GSTN portal glitches to reconciliation mismatches and rising compliance costs, businesses are spending more time fixing errors than focusing on growth. Delayed tax credits and inconsistent filings only make things worse by affecting cash flow and working capital — the lifelines of any business.

For MSMEs, the situation is even tougher. Many struggle with:
- Input Tax Credit (ITC) mismatches that delay refunds.
- Complex HSN and SAC classifications that cause filing confusion.
- Slow and manual refund processes that tie up resources and impact liquidity.

And with new regulatory restrictions, such as the June 2025 rule that prevents editing auto-populated GSTR-3B liabilities unless corrected through GSTR-1A ~ businesses can no longer afford the inefficiencies of manual GST management.
The future of GST compliance lies in automation powered by GST APIs. These APIs connect business systems directly with the GST Network (GSTN), allowing companies to automate filings, validations, and reconciliations in real time ~ saving time, reducing costs, and ensuring accuracy every step of the way.
Automated compliance doesn’t just make GST filing easier; it transforms how businesses handle taxation ~ turning what used to be a burden into a streamlined, transparent, and efficient process.

Let Explore More On the GST API
A GST API is a secure digital bridge that connects your business systems directly with the Goods and Services Tax Network (GSTN) or authorized GSPs (GST Suvidha Providers). 
In simple terms, it allows your accounting or ERP software to talk directly to the GST system ~ automating routine compliance tasks that you would otherwise have to perform manually.
Think of it as a connector that simplifies everything. Instead of logging into the GST portal multiple times a month, a GST API automatically performs key actions for you, such as:

• Validating GSTINs instantly with complete details to ensure vendor authenticity.
• Generating and submitting e-invoices without switching platforms.
• Pulling GSTR data directly into your accounting or ERP systems in real-time.
• Creating e-way bills automatically, removing the need for manual data entry.

This seamless integration means that businesses can now handle all GST compliance tasks from filing returns to tracking invoices, right inside their ERP, accounting, or fintech platforms.

The impact? 

• Faster operations
• More accurate data
• Fewer human errors

For example, with the GST Verification API, businesses can instantly verify vendor GSTINs before processing transactions. 
This not only helps prevent fraudulent entries but also saves time that’s usually lost to manual verification and corrections later.
In essence, GST APIs bring together compliance and convenience,  giving businesses real-time control over their tax data while reducing complexity and workload.

Commonly used APIs
The various GST return filing functions available as APIs are as follows:
A. Registration Module API
B. View ledger details API
C. Payment details API
D. File and submit returns APIs
E. Authentication & Session APIs
F. Miscellaneous activities 
 a. HSN/SAC code search
 b. Notification for notices and alerts
 c. Grievance creation
 d. Search GSTINs

HSN Search API used EaseMyGST ASP

Fetch GSTR 2B Data through Get API

E-Invoice API Developer Portal

Practical Use Cases of GST Public APIs
GST Public APIs aren’t just a technical innovation ~ they’re a practical tool that simplifies how businesses handle daily compliance tasks. 
By integrating directly with GSTN, these APIs allow businesses to perform critical GST operations automatically, without the hassle of manual uploads or repeated portal logins.

Here are some key use cases that show how GST APIs create real value for businesses:

1. GSTIN Verification
One of the most common challenges in vendor management is verifying the authenticity of GSTINs. 
With the GST Verification API, businesses can instantly validate a supplier’s or customer’s GSTIN in real time ~ right from their ERP or accounting system.

This simple step helps prevent:

• Fraudulent transactions with fake or inactive GSTINs.
• Errors in filing due to incorrect GST details.
• Future disputes during audits or reconciliation.

By automating this verification process, companies save time and ensure compliance accuracy during vendor onboarding or registration.

2. Automated GSTR Filing and Corrections
Filing returns manually on the GST portal can be tedious and error-prone, especially when handling multiple entities or high transaction volumes. GST APIs simplify this process by automating return creation, submission, and correction.

Businesses can:

• Generate and file GSTR-1 for outward supplies.
• File GSTR-3B for monthly summaries.
• Make necessary corrections or updates using GSTR-1A — all within their integrated accounting or ERP software

This eliminates the need to switch between systems, reduces manual errors, and ensures that every return is filed accurately and on time.

3. E-Invoice and E-Way Bill Automation
Through GST APIs, businesses can generate e-invoices and e-way bills automatically, without visiting the GST portal. This speeds up invoicing, improves accuracy, and ensures compliance with government mandates. 
It also allows companies to handle large-scale billing and logistics seamlessly, improving overall operational efficiency.

4. Ledger and Payment Tracking
GST APIs provide real-time visibility into your cash ledger, credit ledger, and liability ledger. This makes it easy for businesses to track payments, available credits, and pending dues — helping them manage working capital better and avoid missed payments or penalties.

5. Notifications and Grievance Handling
APIs can also fetch notifications or alerts directly from the GSTN system, ensuring that businesses never miss important updates or notices. 
In case of disputes or errors, grievance APIs help raise and track tickets directly through integrated platforms, improving response times and resolution efficiency.
In short, GST APIs simplify every aspect of compliance — from verification and filing to tracking and reporting. They make GST management faster, more reliable, and completely seamless for modern businesses.

Using Third-Party ASP & GSP Services (Like EaseMyGST)
To make GST compliance easier, taxpayers can use the services of third-party solution providers known as Application Service Providers (ASPs) and GST Suvidha Providers (GSPs) ~ such as EaseMyGST.
These providers act as trusted intermediaries between businesses and the Goods and Services Tax Network (GSTN). By connecting your business systems to GSTN through secure APIs, ASP-GSP platforms automate most GST-related processes, including return filing, reconciliation, and data validation.

To use these services, a taxpayer must authorize API access to their GST portal. This step is crucial for two reasons:
  - Data Security: API access is controlled directly by the taxpayer, ensuring that no unauthorized party can view or modify your GST data.
  - User Control: You decide who can access your data and for how long. You can enable, disable, or limit API access anytime directly from your GST portal settings.

Once access is granted, EaseMyGST handles the heavy lifting — from preparing and submitting returns to managing e-invoices and reconciliation, all while keeping your data secure and compliant.
This means businesses no longer need to log in manually, download reports, or re-enter data repeatedly. Instead, every compliance activity is handled automatically through the secure and intelligent API connection.
Using a reliable ASP like EaseMyGST gives you the best of both worlds ~ automation and security, ensuring your GST filings are fast, accurate, and completely under your control.

Conclusion
API-based compliance is essential for businesses in today's rapidly changing GST scenario.
Manual processes can’t keep up with the growing complexity of filings, reconciliations, and frequent system updates. Errors, mismatched data, and delayed filings can easily impact a company’s cash flow and compliance record.
That’s where GST APIs come in, they bring automation, accuracy, and control. By directly integrating with GSTN, APIs simplify every step of compliance from validating GSTINs and reconciling invoices to generating e-invoices and e-way bills in real-time. 
Businesses can stay compliant effortlessly while maintaining transparency, efficiency, and data security.
With stricter regulations such as non-editable GSTR-3B fields and continuous updates in the Invoice Management System (IMS), automation is no longer optional ~ it’s essential. 
Companies that adopt GST APIs early not only save time and costs but also gain a significant edge in operational efficiency and audit readiness.
EaseMyGST, part of the Ginesys One suite, makes this transition simple. It offers seamless API integration, real-time reconciliation, and advanced automation tools that take the complexity out of GST compliance. 
With EaseMyGST, your business doesn’t just keep up ~ it stays ahead with smart, scalable, and reliable GST automation.