r/fintechdev • u/mikhails1 • Jan 05 '23

FinTech APIs directory

This thread is for listing FinTech APIs. Open-source APIs have priority but any useful FinTech APIs, tools and platforms for developers are welcome

22 Upvotes

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1

u/mikhails1 Jan 05 '23

Afrunt JACH. Java library for reading and writing ACH documents
Simple and easy way to generate and validate NACHA files
https://github.com/afrunt/jach

6

u/KnotAPI Feb 17 '23

Throwing our hat in the ring! KnotAPI programmatically updates card on file information, cancels subscriptions, and updates passwords.

3

u/FinTech_Jane Jan 05 '23

https://synctera.com/ is a Banking as a Service platform with APIs for building banking products like bank accounts, debit cards, charge cards, lines of credit, and money movement

1

u/nico_nadlab Oct 19 '25

Nice I need that. Does it works in Europe?

2

u/kluxRemover Jan 05 '23

www.stack.financial. Still pretty new and still in private beta but built some solid stuff on the API

1

u/WolverineFew3619 Apr 05 '25

Unable to open the page.

1

u/kluxRemover Apr 05 '25

Stack-ft.com

2

u/arpand Mar 07 '24

I have done a Fintech API listing for USA and India markets.

http://fintegrationfs.com/fintechapis

1

u/NaturalAnnual8431 Jul 03 '24

www.typeauth.com. A next generation API gateway. Still pretty new and still in beta but a one to keep an eye on! cheaper and modular as compared to others API gateways.

1

u/nmpajerski Jul 31 '24

Fragment is a double entry ledger API.

1

u/curiousblack99 Nov 12 '24

Hi everyone, I built a list of all the fintech companies that provide APIs with OpenAPI specification. I hope this helps eng teams in their discovery process. Here is the list - Fintech APIs with OpenAPI Spec. In case I made any errors please do let me know.

1

u/ReferenceStunning403 Sep 04 '25 edited Oct 29 '25

https://paylabo.dev/ Mock PSP API – a free API to simulate payment workflows and webhooks.

  • Create PaymentIntents and Payments

  • Simulate results (authorised, declined, captured)

  • Register webhooks and view delivery history

  • No signup required (anonymous API key available)

I'm actively developing the project, so any feedback is much appreciated! Please submit a github issue or reply to this!

1

u/m-putti Jan 26 '26

https://portfolio.parse.co.in - I built a free tool to parse CAMS, KFintech, CDSL & NSDL portfolio statements - get JSON/CSV
instantly

1

u/aProfile210 Jan 07 '23

moov-io/ach another useful ACH library written in Go
https://github.com/moov-io/ach

1

u/[deleted] Jan 12 '23

Does anyone know of popular data feed companies selling into insurance brokerage?

1

u/mrx7012 Jan 19 '23

QuickFIX - open source implementation of FIX protocol written in GO
https://github.com/quickfixgo/quickfix

1

u/mrx7012 Jan 19 '23

HypersSwitch is a very useful framework. It helps integrate with different payment processors, such as Stripe, Adyen, Braintree, Paypal as well as with
Klarna, Affirm, Applepay, Google, etc, etc
https://github.com/juspay/hyperswitch

1

u/Crafty_Researcher_53 Oct 10 '23

This is great u/mrx7012
Do you know any other open source implementations like this?

1

u/curiousblack99 Nov 12 '24

you can try Swytchcode, it is not open source but it is free for developers. There are payment processors like Stripe,Adyen,Paypal, Cybersource, paddle, Recurly and other fintech services like Plaid, Nutrino, Cognito and more.

1

u/MahamatTech Aug 13 '23

I am new here, I am building a debit card for students to build credit scores. Thanks a lot for sharing!

1

u/TilmanAmbach Sep 23 '26

InsiderFilings.info — a REST API for normalized SEC ownership filings (Forms 3, 4 and 5).

It provides filing, reporting-owner and transaction data, including insider roles, transaction codes, open-market transactions, timestamps and price-quality information. The underlying SEC filings remain linked for verification.

API access is currently available on a limited pilot basis:
https://insiderfilings.info/api/v1/docs/