Ledger
OPEN-SOURCE

Open-source ledger engine for money movement at scale

Ledger engine for money movement at scale

Build production-ready financial infrastructure on an immutable, open-source ledger. Get complete traceability for every transaction, balance, and account state in your application.

Build production-ready financial infrastructure on an immutable, open-source ledger.

Trusted by teams at:
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Screenshot of ledger balances details page on Blnk Cloud
Product screenshot of Blnk Cloud showing the transactions page and a summary detail pane on the right.
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Build anything

Whether you are tracking customers' balances, payment states, or internal accounts, you get the building blocks to create exactly what you need—no fuss, no fluff.

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360-degree oversight & control

Have answers for everything happening in your financial application. See what happened, when it happened, how it processed, and why it took place.

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Immutable and reliable

Trust your ledger completely. Every entry is instantly permanent and tamper-proof, creating a reliable audit trail without any extra work.

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Built for scale

Start with exactly what you need today, then seamlessly scale your ledger as your business grows—no constraints, no complications.

FOR DEVELOPERS

Building blocks for your fintech backend.

With our modular design and easy-to use APIs, configure your ledger with complete flexibility and control over its architecture. You can maintain an accurate ledger, or extend its functionality by implementing advanced workflows with our ledger engine.

Given the fact that Blnk is open-source, with support for managed cloud environment, you have solved 70% of our engineering problems, and I see it getting close to 100%.

Mohammed Al-Ameen,
Head of Engineering

Blnk Ledger - Double Entry
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Double-Entry Accounting

Get complete insight into the source and destination of every transaction with a ledger database purpose-built with the double-entry accounting principle.

Blnk Ledger - Multicurrency Wallets
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Multi-Currency Support

Create wallets and accounts in as many currencies as you want in your ledger. Confidently track and keep accurate balances for your users at any point in time.

Blnk Ledger - Balance Monitoring
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Balance Monitoring

Set thresholds and implement automated monitoring systems on your wallet balances. Get notified via webhooks when those thresholds are met or surpassed.

Blnk Ledger - Transaction Workflows
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Transaction Workflows

Programmatically deploy simple to complex transaction workflows for your product. Manage refunds, schedule future transactions, record multi-currency transactions and so much more.

Blnk Ledger - Inflight Transactions (2 Phase Commits)
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Inflight Transactions

Hold a transaction from updating its balances until it meets a set condition set by you. Easily commit or void transactions based on the outcome of the condition set.

Blnk Ledger - Split & Bulk Transactions (Multiple Sources & Destinations)
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Bulk/split transactions

With a single request, process multiple transactions at once. Easily record transactions from one balance to multiple destinations (and vice versa) in your ledger.

FOR BUSINESS TEAMS

Skip the engineering queue. Get direct access to your financial data.

Streamline how you work with your engineers and get the data analytics access you need, when you need it. Replace scattered data tools with one powerful collaborative platform that puts you in control.

Collaboration & access control on Blnk
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Access Control & Back-Office Management

Invite teammates to access and manage ledger data with comprehensive activity tracking, while empowering your business teams with tools that streamline their day-to-day operations and boost efficiency.

A list of some anomalies Blnk helps you detect in your fintech application
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Anomaly Detection

Give your compliance team detective superpowers. Easily flag, investigate, and resolve anomalies in your transaction data in one place.

Learn more
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Blnk - Reports Page
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Reports & insights

Create custom reports (charts, tables, etc) and get real-time insights from your ledger data—all without code.

Questions & answers

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Is Blnk Ledger open-source?

Yes! The Bink Ledger is part of our open-source Core, which you can freely access and modify. The dashboard interface, however, is a premium feature available with our Cloud plans. See pricing plans here.

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How quickly can I get started?

Install our open-source Core, and follow our developer documentation to start building in minutes. To use the dashboard interface, sign up on Cloud and connect your Core instance to start using it immediately.

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What payment integrations are available?

Blnk doesn't include pre-built payment or bank integrations. However, our flexible ledger infrastructure lets you build your own custom integrations for any service—from payment processors to banking systems.

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What technology stack is it built with?

Blnk is containerised with Docker, making it language-agnostic—you can interact with it using any programming language. Under the hood, Blnk runs on a modern stack: Go for the core engine, PostgreSQL for data storage, Redis for caching, and Typesense for fast search capabilities.

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How do I resolve issues if I'm stuck implementing the Ledger?

You can ask questions on our Discord channels. You can also reach out to us on our official support channels, or create an issue on Github.

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How active is the Blnk developer community?

Our open-source Core is actively supported by a growing community hosted on Discord, where developers collaborate to build and improve the codebase. Join here to share ideas, get help, and contribute.

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What happens to my data if Blnk shuts down?

Since the Blnk Ledger is fully open-source, you maintain complete ownership and control of your data. With the Ledger self-hosted on your infrastructure, you can continue operations independently, ensuring business continuity regardless of Blnk's status.