> For the complete documentation index, see [llms.txt](https://docs.aeralend.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.aeralend.app/readme.md). # What Aera is Aera is a lending market on Cookie Chain for COOK, with perps and swaps around it. What each part does, what it costs, and where to start. Aera is a lending market on Cookie Chain. You lend and borrow **COOK**, and a few products are built around it. * [**Lend COOK**](/getting-started/lend-cook.md) and earn what borrowers pay. [**Borrow COOK**](/getting-started/borrow-cook.md) by locking bCOOK, up to 55% of what it is counted at, while its staking rewards keep accruing. * [**Trade perps**](/getting-started/trade-perps.md) on SOL, BTC, ETH, HYPE and COOK, or [provide liquidity](/getting-started/provide-perps-liquidity.md) to them. Perps are moving from aSOL to **bCOOK** as margin, on a new program that is built and tested, not deployed. Its limits follow COOK's thin pools, so it is a few-dollar product for now, and [Wick-proof positions](/getting-started/wick-proof-positions.md) launch paused. * [**Swap, Limit, Stop and Stake COOK**](/getting-started/trading-and-staking.md) through Cookie Chain's own venues. * [**Creator markets**](/how-it-works/creator-markets.md) are closed for now. They will return quoted in COOK. {% hint style="info" %} **aSOL is retired.** On 22 October 2026 Aera closed its SOL market, aSOL staking and Yield Tokens. If you hold aSOL, [redeem it 1:1 for SOL](/getting-started/redeem-asol.md) on Lend. {% endhint %} No governance token, no points, no airdrop. Your wallet signs every transaction, and each one is tried against the live chain before you are asked. ## Why anyone uses it **bCOOK keeps earning while it is locked.** bCOOK is staked COOK from [BakeYourStake](https://stake.cookiescan.io). When you post it as collateral, Aera holds the token — it does not unstake it and it does not touch the rewards. Your staking position continues exactly as it was, and you have borrowed COOK on top of it. ## What it costs | | | | --------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------- | | Lending | Free. Aera keeps **15%** of the interest borrowers pay. | | Borrowing | A one-off origination fee of **0.15%**, plus interest while the loan is open. | | Swaps | **0.10%** of what you pay. | | Perps | **0.08%** of the position's size, to open and again to close. Wick-proof positions also prepay an hourly wick fee; the unused part is refunded. | | Staking COOK for bCOOK | No Aera fee. BakeYourStake's own fee applies. | | Repaying, locking, unlocking, withdrawing, redeeming aSOL | Free. | Cookie Chain transaction fees apply to all of them and are paid in COOK. Every fee is in [Interest and fees](/how-it-works/interest-and-fees.md). ## What you are exposed to * If you borrow, **your collateral can be seized** when your health falls below 1.00. * Withdrawing what you lent needs **free liquidity in the pool**. If borrowers hold most of it, you wait. * **Aera has not been audited.** {% content-ref url="/pages/t7LXQCcQWJrLM6ymIahu" %} [Risks](/security/risks.md) {% endcontent-ref %} ## Where to start {% content-ref url="/pages/S8a70qhMCy3DX9EO1kLX" %} [Connect a wallet](/getting-started/connect-a-wallet.md) {% endcontent-ref %} {% content-ref url="/pages/wIvKn0ES4s9Kxg6lmTVr" %} [Lend COOK](/getting-started/lend-cook.md) {% endcontent-ref %} {% content-ref url="/pages/dRqYMvrYoCIdu0uMkoLN" %} [Borrow COOK](/getting-started/borrow-cook.md) {% endcontent-ref %} ## Addresses | | | | -------------------------------------------------- | ---------------------------------------------- | | Aera lending program | `AerafpFHsY4N16i4KufPJQyURryxKtYgCr6oZMwbp76q` | | Perps program, bCOOK version (built, not deployed) | `AE5G6RFSxbyJ5HLCSAiXTb96WUkj9tr9zLxjWwZkp4m2` | | Perps program, aSOL version (retired 2026-10-22) | `GqvG8aNWa8fJ8xuoPqqHbPiowVbX4GWm8gMPsSyFgJfq` | | COOK | `So11111111111111111111111111111111111111112` | | bCOOK | `EkPafx58mgwkEnGwo62jXhXDAdJ37Z8G8MFBRPsr9uhz` | | aSOL (retired, redeem only) | `FHv5bDrikq9sA4ckNNTsvqZHGoWYSnPMFJC8xHszKwbq` | | Bridged SOL, what aSOL redeems for | `6tL24Fn75uCMrBSZAvohAq57LSv6KrY6ceEq1wonvucb` | | aSOL staking program (retired) | `BJ3ntXXQGe1u4PLfMBNQWubU9T5C4Qsd2SwWZPkR1uvB` | | Yield Tokens program (retired, never opened) | `9HxtpgBhkfmZvHRh643YSpM5tiRGci5uXQSduEYwMvzq` | {% hint style="warning" %} **Check the address, not the symbol.** A token symbol is a label anyone can reuse; the mint address is the token. {% endhint %} *** Screenshots throughout this space are of the real application, never mockups. Some show Cookie Chain's figures at the moment they were taken; others show **illustrative balances** or invented test epochs, and the caption under each says which. The **terms** in them are the ones Aera runs on. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.aeralend.app/readme.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.