> ## Documentation Index
> Fetch the complete documentation index at: https://developer.fin.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Legends & Concepts

Learn key concepts & terminologies to work with the Fin Crypto Orchestration Layer.

| **Term** | **Definition** |
| :- | :- |
| **Currency** | Fin considers all forms of assets as a currency. USDC, USD, all are **currencies** to us |
| **Rail** | Fin considers all forms of blockchains, fiat rails, and everything under the umbrella term `rail` |
| **Integration type** | This indicates what kind of integration you want to use |
| **Settlement via** | How you would like your funds to be settled to your end user |
| **Rebalancing fees** | Subsidise the fees on behalf of your users by maintaining a rebalancing wallet address with Fin that will inject funds on each deposit |
| **Developer fee** | Collection of fees on your users transactions |


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.