Tax Compliance APIs for India

  • GST, Einvoice, EWay bill APIs and more
  • Low code integrations for instant deployment
  • Pay per use with no monthly/annual commitments

Approved Service Provider with Govt. Portals

Fynamics is an Approved GST Suvidha Provider (GSP) with GSTN and ERP with NIC for direct API connectors

Your data is in safe hands as we are an approved service provider for the various services. Use FYN Gateway as the passthrough mechanism to perform various compliance activities seamlessly.

  • Auth token managed exclusively by you only
  • Complete control on every API hit including detailed dashboard reports
  • Single point contact for all your compliance needs

Whether you are an e-commerce operator or a fintech or a neo bank or a system integrator, you'll find all your tax compliance requirements taken care by our APIs.


Secure by Setup

All connections, including staging as well as production, are end to end encrypted and uses TLS 1.2+


Convenience at Core

The industry's first API warehouse to connect multiple tax compliance modules with a single gateway


Economical as Ever

End to end APIs starting at just 0.10 Rs. Its so low that it hardly pinches you. Easy realtime top-ups.

Happy Clients




Hour to build



Popular API's

Tax Compliance APIs from FYN gateway are so easy to understand and integrate. Here's a quick look at some of the popular API's that our clients frequently use.

Generate IRN

Generate EWay Bill

Save GSTR1

Check Returns Filing



Cancel IRN

Modify EWB Part B

Check Taxpayer

Save GSTR9

Generate Challan

Request OTP


From MNCs to Startups, System Integrators to SMBs, FYN Gateway APIs are open to all. Get on-board the fastest and most economical Tax API gateway and bring your compliance on track


Clients dont love us just for the product and support. They love our pricing too!
Introducing industry's first ever flexible pay-per-use pricing with ZERO on-boarding charges/one-time setup costs/annual or monthly costs

Free Sandbox APIs


  • Access to Einvoice & EWay bill Sandbox
  • User created access keys for authentication
  • Onboarding in under 15 mins
Get Started

Enriched ASP APIs

Slabbased pricing

  • Fynamics handles Encryption/Decryption + authentication
  • Pricing only on success transactions
  • Detailed client level data reporting and MIS dashboards
  • Web and app access, to you and extended stakeholders
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Frequently Asked Questions

  • We follow best in class security mechanisms to ensure your data is safe in transit and at rest. If you use the GSP Passthrough APIs, then we dont even know the API payload as entire encryption and decryption happens at your end only.

  • Fynamics is a leading full stack GST solution and an approved GSP catering to 1000s of taxpayers, large and small. FYN Gateway is from the same stables with powerful ERP agnostic API connectors. Consider us for a) Uncompromising Support b) Technically sound and c) Economical

  • We are industry's most preferred service provider for the level of support we provide our clients. Every account, large or small, gets a dedicated account manager with a 2 level escalation matrix for anytime call/mail. We also have monthly/quarterly client review meetings to hear your suggestions and improve our services further.

  • We are not required to be PCI DSS approved as we dont store any card information with us. That said, any payment gateways that we integrate are certainly approved ones only so you can be rest assured that your banking information is not misused

  • As FYN Gateway, we want to be a one stop solution for all your tax & statutory compliance activities. We would also explore additional setups like banking/payments and more. Keep visiting us or talk to your Fynamics RM to stay updated on the latest happenings.

  • We are all ears to your queries. Reach us at the coordinates mentioned below either via email / tele call and we'll setup a larger discussion in person or via MS Teams.


We are just a call/mail away. Reach out to us anytime on the below coordinates

Our Address

102 Margosa Plaza, 50-56 Margosa Road, Malleswaram, Bangalore-55

Call Us

+91 91641 65777

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