Gemini supports the ERC-20 Polygon (MATIC) asset but Gemini does not support transfers via the Polygon/Matic network. In order to successfully deposit Polygon (MATIC) to your Gemini account please be sure the assets you are transferring are on the Ethereum mainnet (ERC-20 token).

Polygon is an Ethereum compatible solution that functions as a parallel network that helps Ethereum scale. Although many tokens exist on different networks, it is important to note that sending assets from the Polygon mainnet to the Gemini exchange will result in lost funds.