> For the complete documentation index, see [llms.txt](https://docs.senmo.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.senmo.io/segment-ledger/overview.md).

# Overview

Segment Ledgers is a modern, API-first ledger engine that enables developers to build secure financial products with accurate, double-entry accounting.

Whether you're creating a digital wallet, payment platform, banking application, marketplace, crypto exchange, payroll system, or internal financial infrastructure, Segment Ledgers provides the accounting foundation needed to track every movement of money with complete accuracy and auditability.

Unlike traditional balance systems that simply increase or decrease a number, Segment Ledgers records every financial event as immutable ledger entries, ensuring balances remain consistent, traceable, and fully auditable throughout the lifetime of your application.

## Why Segment Ledgers?

Managing balances may seem simple at first, but financial systems quickly become complex as products grow. Transfers, fees, refunds, reversals, settlements, pending payments, multiple currencies, and reconciliation all introduce challenges that cannot be solved reliably by updating a single balance field. Segment Ledgers is designed specifically to solve these challenges by implementing a true double-entry accounting model. Every transaction creates balanced debit and credit entries, guaranteeing that money is always accounted for and financial records remain accurate. The platform handles the complexity of ledger management so developers can focus on building products rather than accounting infrastructure.

### Built for Modern Financial Applications <a href="#built-for-modern-financial-applications" id="built-for-modern-financial-applications"></a>

Segment Ledgers can power a wide variety of financial products, including:

| Digital Wallets      | Banking Platforms            | Payment Processors         |
| -------------------- | ---------------------------- | -------------------------- |
| FinTech Applications | Marketplaces                 | Merchant Platforms         |
| Crypto Exchanges     | Lending Platforms            | Treasury Systems           |
| Payroll Solutions    | Expense Management Platforms | Internal Financial Systems |