Mobile to GST Verification API – Instantly Verify GST Using Mobile Number
Our Mobile to GST Verification API enables businesses to fetch GST details using a registered mobile number in real-time. It simplifies business verification, enhances onboarding speed, and reduces fraud risks by providing accurate GST-linked information instantly.
Government of India
Registration Certificate
Form GST REG-06 [See Rule 10(1)]
Registration Number: 37AAAAA0000A1Z5
| Legal Name | Your Private Limited Company |
| Trade Name | Brand / Trading Name |
| Constitution | Private Limited Company |
| Address | Sector 62, Noida, Gautam Buddha Nagar, Uttar Pradesh, 201301 |
Date of Liability: 01/01/2026
Period of Validity: From 01/01/2026 To NA
Note: To be prominently displayed at business place.
DIGITAL SEAL
Approving Authority
Andhra Pradesh State Tax
Type of Registration
Regular Taxpayer
DIGITALLY VERIFIED SIGNATURE
Officer: VARIGONDA GIRIJA
Designation: GST Officer
Jurisdiction: CHITTOOR-I
Timestamp: 2026-04-06T15:40:22Z
System Generated Document
No signature required manually
Instant Mobile-to-GST Identification
Identify business entities and GST details associated with any mobile number using our advanced lookup API.
1. Input Number
Submit the 10-digit mobile number linked to a business or authorized signatory.
2. Pattern Match
Our API cross-references telecommunication signals with official GST tax records.
3. Tax Profile
Receive the verified GSTIN, Legal Name, and registration status in milliseconds.
Why Use Our Mobile to GST Mapping API?
Bridge the gap between contact details and tax identities. Perfect for vendor onboarding, credit assessment, and fraud prevention.
Frictionless Onboarding
Auto-fill business details for your users using just their phone number, reducing drop-off rates.
Identity Verification
Confirm if a mobile number belongs to the authorized representative of a specific GSTIN holder.
Lead Enrichment
Enhance your CRM data by adding firm names and tax statuses to simple phone lead lists.
High Match Accuracy
Leverages proprietary algorithms to ensure high confidence matching between telecom and tax data.
Developer-First Integration
Simple RESTful endpoints that return clean JSON, designed for seamless integration into any tech stack.
Compliance Ready
Operate with peace of mind using a secure infrastructure that respects data privacy and regulations.
Next-Gen API for Mobile to GST Discovery
Identify and verify business tax profiles using only a mobile number. Seamlessly link contact data to official GSTIN records for instant identity resolution.
Instant Entity Mapping
Retrieve the Legal Name, GSTIN, and Business Constitution linked to any mobile number to verify the true identity of your leads or vendors.
Signatory Linkage
Validate if the mobile number belongs to an authorized signatory, ensuring high-trust verification for digital contracts and registrations.
Registration Intelligence
Confirm the current status of the GST registration and its primary place of business directly via the mobile number provided.
Advanced Contact & Tax Intelligence
Transform your verification workflow with our Mobile-to-GST API. By bridging telecom data and tax records, we enable businesses to automate due diligence, prevent identity theft, and accelerate onboarding with authenticated, real-time insights from the GST network.
🚀 Features of Mobile to GST API
Bridge the gap between contact numbers and tax identities. Automate lead qualification, identity resolution, and vendor verification with real-time mobile-GST linkage data.
Instant Linkage
Submit a 10-digit mobile number and instantly receive the associated GSTIN and legal entity name.
Auth Validation
Verify if a mobile number belongs to the primary authorized signatory registered in official tax records.
Business Type
Determine business constitution—Proprietorship, Partnership, or Pvt Ltd—linked to the contact number.
Fraud Deterrent
Identify mismatches between user-claimed identities and real tax registrations to prevent digital fraud.
RESTful Integration
Clean, standardized JSON responses designed for onboarding flows and mobile app integrations.
Scalable Infrastructure
Built for high-concurrency requests, ensuring fast response times during peak onboarding hours.
Entity Status
Receive real-time status updates (Active/Inactive) for the business entity associated with the number.
KYC Compliance
Enhance your KYC stack by adding a layer of cross-verified phone-to-tax records.
How Mobile to GST Works
Map any mobile number to its registered business tax identity through a seamless, 4-step automated verification process.
Submit Number
Pass the user's mobile number through our secure API endpoint during registration or verification.
Database Lookup
Our system queries telecom and GSTN databases to find authenticated links between the number and entity.
Entity Validation
The engine validates the GSTIN status, legal name, and signatory details for compliance and accuracy.
Verified Result
Receive a structured JSON object containing the verified business profile mapped to the contact number.
Why IDSPay Offers the Best Mobile to GST API?
Experience the gold standard in contact-based business identity and tax registration verification.
Sub-Second Latency
Real-time mapping of mobile numbers to GSTINs with the fastest response times.
99.99% Availability
Reliable infrastructure ensuring seamless identity checks for every user onboarding.
Enriched Entity Data
Get comprehensive JSON responses including legal name and tax registration status.
Transparent Billing
Cost-effective per-verification pricing that scales with your platform's growth.
Expert Integration Help
Dedicated support to help you implement mobile-to-GST verification into your existing CRM or App.
Deploy Mobile to GST API in Minutes
Link contact numbers to official tax identities with our developer-first infrastructure. Retrieve real-time GSTIN mapping, legal entity names, and registration status via production-ready RESTful endpoints.
curl --request POST \
--url [https://api.idspay.in/v3/gst/mobile-discovery](https://api.idspay.in/v3/gst/mobile-discovery) \
--header 'Authorization: Bearer YOUR_API_KEY' \
--header 'Content-Type: application/json' \
--data '{
"mobile": "9876543210",
"verify_signatory": true,
"consent": "Y"
}'{
"status": "SUCCESS",
"data": {
"mobile": "9876543210",
"associated_gstin": "07AABCU9603R1ZV",
"legal_name": "IDSPAY FINTECH SOLUTIONS",
"is_authorized": true,
"entity_status": "Active",
"last_updated": "2024-03-15"
}
}Why We Are The Better Choice
Compare our performance and see why top fintechs trust our infrastructure.
| Feature | 🚀 Our API | Other Providers |
|---|---|---|
| Accuracy |
99.9% (Govt. Direct)
|
~85-90% (Scraped)
|
| Speed |
< 500ms
|
2 - 5 Seconds
|
| Pricing |
Pay-per-use (No Fixed Fee)
|
High Monthly Commitment
|
| Support |
24/7 Priority Support
|
Email-only (48hr TAT)
|
* Based on internal benchmark tests and competitor analysis (April 2026).
Frequently Asked Questions
Everything you need to know about the Mobile to GST Verification API.
1. How does the Mobile to GST Verification API work?
The API takes a 10-digit mobile number as input and cross-references it with telecom and GSTN records to identify any GSTIN where that number is registered as a primary contact or authorized signatory.
2. Is user consent required to use this API?
Yes, to comply with data privacy regulations, businesses should ensure they have user consent before initiating a lookup. The API is designed for legitimate business verification, onboarding, and fraud prevention use cases.
3. Can one mobile number return multiple GSTINs?
Yes. If a single individual or authorized signatory has registered multiple businesses or branches using the same mobile number, the API will return a list of all associated GSTINs linked to that specific contact.
4. What business details are included in the response?
The API returns the GSTIN(s), the Legal Name of the business, the Trade Name, the registration status (Active/Inactive), and the constitution of the business (e.g., Proprietorship, Partnership).
5. How does this help in preventing digital fraud?
It prevents "identity spoofing" by ensuring the mobile number provided by a user actually belongs to the business entity they claim to represent, effectively filtering out fake profiles during onboarding.
6. Is the data retrieved in real-time?
Yes. We query live datasets to ensure you get the most current linkage information available, allowing for immediate verification during high-speed checkout or sign-up flows.
7. What is the typical API response time?
Our API is optimized for sub-second performance, typically delivering a response within 200-500ms, making it ideal for integration into mobile applications and web portals.
8. Can I use this for B2B lead qualification?
Absolutely. It’s a powerful tool for sales teams to instantly qualify a lead by seeing if a prospect’s mobile number is tied to a legitimate, active GST-registered business.
9. What happens if a number is not linked to any GSTIN?
The API will return a "No Record Found" status. This helps in identifying non-business users or individuals who may not be registered taxpayers under the GST regime.
10. How can I start testing the API?
You can sign up on the IDSPay developer portal to get your API keys and access our sandbox environment. We provide detailed documentation and sample code to get you started in minutes.