Matcha is very secure! In addition to thorough testing by 0x Labs, top blockchain security companies, Trail of Bits, and ConsenSys Diligence audited the 0x v3 smart contracts which Matcha uses. You can review their audit results here:

Also, unlike a centralized exchange that can mismanage or lose your tokens, when you make a trade on a decentralized exchange, like Matcha, you retain complete custody of your tokens throughout the entire trading process.

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