> ## 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                                                                                          |