--- title: 3A DAO Docs nav: Overview description: How to use the OPS swap at swap.3adao.org, and how the 3A borrowing protocol works. section: Start here order: 1 --- 3A DAO builds the 3A borrowing protocol (EURO3, vaults, the Stability Pool and the A3A token) and runs the OPS swap at [swap.3adao.org](https://swap.3adao.org), where you can buy OPSBTC and OPSSOL. These docs are written for ordinary users and for AI agents. They say what the software does, including what happens to your money when something goes wrong. Nothing here is financial advice. Tokens can lose value, and on-chain transactions cannot be reversed. ## Start here If you want to buy OPSBTC or OPSSOL: 1. [What the OPS swap is](/swap/what-is-the-swap): the tokens, the pool price against NAV, and which chains. 2. [Before you start](/swap/before-you-start): wallet, gas, what you will sign. 3. [Buy with USDC on Arbitrum](/swap/buy-with-usdc-on-arbitrum): the direct route. 4. [Buy from another chain](/swap/buy-from-another-chain): one signature and one deposit. 5. [Track your buy](/swap/track-your-buy): what each status means, and why EXPIRED is not always final. 6. [Leftover USDC and sending it back](/swap/leftover-usdc). 7. [Troubleshooting](/swap/troubleshooting) and [Risks and fees](/swap/risks-and-fees). More: [Selling OPS tokens](/swap/sell), [Reading the page](/swap/reading-the-page) and the [FAQ](/swap/faq). If your wallet shows a security warning on any page that asks you to connect or approve, stop. Do not click through it. Contact 3A DAO. ## The 3A protocol (archived) The 3A lending protocol and EURO3 on Linea and Polygon were phased out in 2024, and the last vaults closed on 30 November 2024 ([announcement](https://medium.com/@3aDAO/phasing-out-euro3-lending-f5869a3498a8)). Its documentation is kept for reference: EURO3, vaults, the Stability Pool, liquidations, the A3A token, contracts and audits start at [Welcome to 3A](/3a-protocol/welcome-to-3a). ## For AI agents Every page here is available as markdown: add `.md` to its path. The full list of pages is at [llms.txt](/llms.txt).