# FAQ

### [**General**](https://legacy-docs.polymarket.com/faq/general) 

* [What is Polymarket?](https://legacy-docs.polymarket.com/general#what-is-polymarket)
* [What blockchain is Polymarket built on?](https://legacy-docs.polymarket.com/general#what-blockchain-is-polymarket-built-on)
* [What is USDC and where can I buy it? ](https://legacy-docs.polymarket.com/general#what-is-usdc-and-where-can-i-buy-it)
* [What browsers do you support? ](https://legacy-docs.polymarket.com/general#what-browsers-do-you-support)

### [Connecting to Polymarket](#undefined)

* [What is a proxy wallet?](https://legacy-docs.polymarket.com/connecting-to-polymarket#what-is-a-proxy-wallet)

### [Deposits & Withdrawals](https://legacy-docs.polymarket.com/faq/deposits-and-withdrawals)

* [Why are there fees to deposit and withdraw my USDC and why do I need to pay them?](https://legacy-docs.polymarket.com/deposits-and-withdrawals#why-are-there-fees-to-deposit-and-withdraw-my-usdc-and-why-do-i-need-to-pay-them)
* [Why did the network fee become more or less expensive?](https://legacy-docs.polymarket.com/deposits-and-withdrawals#why-did-the-network-fee-become-more-or-less-expensive)
* [I deposited USDC using MetaMask but my funds aren't appearing.](https://legacy-docs.polymarket.com/deposits-and-withdrawals#i-deposited-usdc-using-metamask-but-my-funds-arent-appearing.)
* [How is the network fee calculated?](https://legacy-docs.polymarket.com/deposits-and-withdrawals#how-is-the-network-fee-calculated)
* [How do I know if a Peer-to-peer user is trustworthy?](https://legacy-docs.polymarket.com/deposits-and-withdrawals#how-do-i-know-if-a-peer-to-peer-user-is-trustworthy)
* [Why is my debit or credit card not working?](https://legacy-docs.polymarket.com/deposits-and-withdrawals#why-is-my-debit-or-credit-card-not-working)
* [I had an old, pending manual deposit/withdrawal and I can't find it anymore. What happened to my funds?](https://legacy-docs.polymarket.com/deposits-and-withdrawals#i-had-an-old-pending-manual-deposit-withdrawal-and-i-cant-find-it-anymore.-what-happened-to-my-funds)
* [10 minutes have passed and I still haven't received my funds.](https://legacy-docs.polymarket.com/deposits-and-withdrawals#10-minutes-have-passed-and-i-still-havent-received-my-funds.)

### [Markets](https://legacy-docs.polymarket.com/faq/markets)

* [What is an information market?](https://legacy-docs.polymarket.com/markets#what-is-an-information-market)
* [What sets the probabilities on a market?](https://legacy-docs.polymarket.com/markets#what-sets-the-probabilities-on-a-market)
* [What are the different types of markets?](https://legacy-docs.polymarket.com/markets#what-are-the-different-types-of-markets)
* [I have a great idea for a market. Do you take suggestions?](https://legacy-docs.polymarket.com/markets#i-have-a-great-idea-for-a-market-do-you-take-suggestions)

### [Portfolio & Shares](https://legacy-docs.polymarket.com/faq/trading)

* [What do I need to do before I can start trading?](https://legacy-docs.polymarket.com/trading#what-do-i-need-to-do-before-i-can-start-trading)
* [How should I decide whether to buy shares?](https://legacy-docs.polymarket.com/trading#how-should-i-decide-whether-to-buy-shares)
* [I've changed my mind about a trade. Can I sell my shares?](https://legacy-docs.polymarket.com/trading#ive-changed-my-mind-about-a-trade-can-i-sell-my-shares)
* [When does a market close?](https://legacy-docs.polymarket.com/trading#when-does-a-market-close)
* [What are my shares worth if I hold them until the market is resolved?](https://legacy-docs.polymarket.com/trading#what-are-my-shares-worth-if-i-hold-them-until-the-market-is-resolved)
* [Can I own both ‘Yes’ and ‘No’ shares for a market at the same time?](https://legacy-docs.polymarket.com/trading#can-i-own-both-yes-and-no-shares-for-a-market-at-the-same-time)
* [I received an error when I submitted my trade. What do I do?](https://legacy-docs.polymarket.com/trading#i-received-an-error-when-i-submitted-my-trade.-what-do-i-do)
* Can I set my own gas when submitting a transaction? 

### [Liquidity](https://legacy-docs.polymarket.com/faq/liquidity)

* [How does liquidity work at Polymarket?](https://legacy-docs.polymarket.com/liquidity#how-does-liquidity-work-at-polymarket)
* [Why is liquidity necessary for the markets?](https://legacy-docs.polymarket.com/liquidity#why-is-liquidity-necessary-for-the-markets)
* [What is the incentive for me to add liquidity?](https://legacy-docs.polymarket.com/liquidity#what-is-the-incentive-for-me-to-add-liquidity)
* [How do I know how many liquidity shares I will get?](https://legacy-docs.polymarket.com/liquidity#how-do-i-know-how-many-liquidity-shares-i-will-get)
* [Are there any risks to adding liquidity?](https://legacy-docs.polymarket.com/liquidity#are-there-any-risks-to-adding-liquidity)
* [I received an error when I tried to remove my liquidity. What do I do?](https://legacy-docs.polymarket.com/liquidity#i-received-an-error-when-i-tried-to-remove-my-liquidity.-what-do-i-do)

### [Resolution](https://legacy-docs.polymarket.com/faq/resolution)

* [What happens when a market resolves?](https://legacy-docs.polymarket.com/resolution#what-happens-when-a-market-resolves)
* [What should I do when a market resolves?](https://legacy-docs.polymarket.com/resolution#what-should-i-do-when-a-market-resolves)
* [Can there be more than one winner in a market?](https://legacy-docs.polymarket.com/resolution#can-there-be-more-than-one-winner-in-a-market)

### [Security](https://legacy-docs.polymarket.com/faq/security)

* [Have Polymarket's smart contacts been audited?](https://legacy-docs.polymarket.com/security#have-polymarkets-smart-contacts-been-audited)
* [Where are my funds if you don't use MetaMask?](https://legacy-docs.polymarket.com/security#where-are-my-funds-if-you-dont-use-metamask)
* [Why do you need my email?](https://legacy-docs.polymarket.com/security#why-do-you-need-my-email)
* [How can I export my private key?](https://legacy-docs.polymarket.com/security#how-can-i-export-my-private-key)
* [Will you ever ask for my private key?](https://legacy-docs.polymarket.com/security#will-you-ever-ask-for-my-private-key)