General FAQ
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To earn interest, simply deposit into your Mango Markets Account; all assets automatically earn interest. Annual rates are displayed in the Account page in green.
V4 (app.mango.markets) is the only currently supported version of Mango Markets.
V3 (v3.mango.markets) is an inactive version of Mango Markets.
V2 (mango.markets) supports SOL, SRM, BTC, ETH, and USDC trading. Borrows are disabled and it is not recommended to use this version.
V1 (usdt.mango.markets) supports BTC, ETH, and USDT trading, borrowing, and lending. SRM deposits do not count as collateral or earn interest.
Our system checks deposits, positions, and borrows accounts to ensure that an individual cannot withdraw more than their equity, calculated by val(deposits) +val(open orders) - val(borrows).
There is an insurance fund to cover socialised losses to lenders on v3.
Mango Markets code has been informally reviewed by Serum and Solana devs as well as the German white hat hacker team “Alles!"
Immediate or cancel (IOC). If an order is placed and not filled within 10 seconds, it is cancelled.
POST limit orders are added to the order-book and earn maker fees if filled. POST orders will always be the "maker."
Connect wallet and click "Fee Discounts." There is an option to Deposit SRM.
equity = val(deposits) +val(open orders) - val(borrows)
The interest rate is a function of the utilisation ratio: total borrowed by all users divided by total deposits of all users. The interest rate will increase slowly approaching a utilisation ratio of 70% but will increase rapidly above that to encourage the market to deposit more funds.

Yes, to cover costs of creating necessary accounts on the Solana blockchain and storage.
The costs is 0.032 SOL to create a Mango Markets Account and also 0.025 SOL for each new spot market they trade on.