Everything you need to build fast.
Build fintech that works. Our open-source backend gives developers the tools to build secure, scalable financial products—fast and without the headache.
Blnk is the bespoke tool crafted for modern fintech engineering and operations.
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curl -X POST http://api.acme.com/transactions \
-H "Content-Type: application/json" \
-d '{
"amount": 120350.28,
"reference": "ref_001adcfgf",
"currency": "USD",
"precision": 100,
"source": "bln_28edb3e5-c168-4127-a1c4-16274e7a28d3",
"destination": "bln_ebcd230f-6265-4d4a-a4ca-45974c47f746",
"description": "Sent from app",
}
Meet the software crafted for modern fintech engineering and operations.
The fintech engine for every product
Supercharge your product. Build secure, compliant financial solutions effortlessly. Blnk gives you the foundation to create products that scale.
See it for yourself
Ledgers and ledger balances
Keep a precise and correct record of all balances and transactions within your application.
Transaction workflows
Build and tailor modular transaction workflows with minimal effort and code.
Reconciliation
Create and run reconciliation workflows seamlessly within your ledger.
Identity management
Securely record and manage user identities and their financial activities.
Engineered for financial integrity
Blnk’s foundation is rooted in proven financial principles like double-entry ledgers. Every product you build is designed for accuracy, security, and long-term reliability.
See for yourselfBuild together with our open-source community
Join forces with developers worldwide to create fintech solutions that make an impact. Contribute, collaborate, and be part of the future with Blnk's open source backend.
Join our DiscordAvailable SDKs in the languages you know
Blnk offers SDKs in your preferred languages. Integrate our fintech backend effortlessly and keep your focus on building the products that matter to you.
Explore SDKsThe software crafted for modern fintech engineering and operations teams.
We're building a payments/remittance product, and we decided we needed a good ledger. We searched multiple tools online and found Blnk—a very simple, easy-to-understand, yet sophisticated tool. I particularly love its reconciliation and double-entry feature.
Got questions? We have answers.
Under what license is Blnk's open-source backend released?
Blnk is released under the Apache License 2.0. This permissive license allows you to use, modify, and distribute the code freely, even in commercial applications.
Can I modify the source code to suit my needs?
Yes, you can. The Apache License 2.0 permits you to modify and customize the code to fit your specific requirements.
Is Blnk free to use?
Absolutely. Blnk is open-source and completely free to use. There are no licensing fees or hidden costs.
What types of products can I build with Blnk?
Blnk is versatile and can be used to build a wide range of financial products—from payment systems and digital wallets to lending platforms and investment apps.
How do I get started with Blnk?
You can start by visiting our GitHub repository to access the code and documentation. Choose the SDK in your preferred language and follow the setup guides to integrate Blnk into your project.