For Optimism chain, the following list of tokens are supported in the mainnet environment.

Token Name	Symbol	Type	Token Address
Tether USD	USDT	ERC20	0x94b008aa00579c1307b0ef2c499ad98a8ce58e58
USD Coin	USDC	ERC20	0x0b2c639c533813f4aa9d7837caf62653d097ff85
USD Coin (Bridged from Ethereum)	USDC.e	ERC20	0x7f5c764cbc14f9669b88837ca1490cca17c31607
ChainLink Token	LINK	ERC20	0x350a791bfc2c21f9ed5d10980dad2e2638ffa7f6
Wrapped BTC	WBTC	ERC20	0x68f180fcce6836688e9084f035309e29bf0a2095
Dai Stablecoin	DAI	ERC20	0xda10009cbd5d07dd0cecc66161fc93d7c9000da1
Optimism	OP	ERC20	0x4200000000000000000000000000000000000042
Lido DAO Token	LDO	ERC20	0xfdb794692724153d1488ccdbe0c56c252596735f
Synthetix Network Token	SNX	ERC20	0x8700daec35af8ff88c16bdf0418774cb3d7599b4
Frax Ether	frxETH	ERC20	0x6806411765af15bddd26f8f544a34cc40cb9838b
Collab.Land	COLLAB	ERC20	0x8B21e9b7dAF2c4325bf3D18c1BeB79A347fE902A

To add new tokens, raise a support ticket as directed in the Add new tokens guide.