> For the complete documentation index, see [llms.txt](https://docs.arenas.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.arenas.fi/atomica/atomica-protocol.md).
# Atomica Protocol
Arenas Financing Markets financing runs on top of the **Atomica Protocol**, which acts as the engine for risk and financing products. You don’t interact with Atomica directly, but it defines how Arenas financing markets work under the hood.
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### What Atomica does for Arenas
Atomica provides configurable financing products that Arenas uses as a base template for all Financing Markets. This product defines high-level rules that are shared across markets, such as:
* **Capital / borrow token** – which asset is used for supplying and borrowing (e.g. USDC).
* **Oracles** – which price feeds are trusted for rates and accounting.
* **Financing market** – the contract that actually sends funds to borrowers and receives repayments
* **Withdraw rules for LPs** – optional delays and expiry windows for withdrawal requests.
* **Fee limits** – maximum % of interest that can be taken as protocol or market manager fees.
* **Who can create markets** – an allowlist of addresses that are allowed to deploy new Financing markets on this product.
Who can create financing markets – an allowlist of addresses that are allowed to deploy new Financing markets on this product.
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### How this affects you
As a **lender** or **borrower** you mainly interact with:
* The Financing market UI (specific financing pool / program), and
* The **market operator** (or approver) who approves obligations.
Atomica stays in the background and ensures that:
* All markets on Arenas follow the same **core rules**,
* Fees and permissions stay within predefined **limits**, and
* Liquidity, payouts and repayments use the same **standardized engine**.
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