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Adding Custom Tokens to MetaMask

Native Tokens

In Meter, both MTR and MTRG are native network coins. However, Metamask can only display one native coin (ETH in Ethereum's case). We configured the gas token MTR to replace the default ETH in the wallet.
To properly display and transact MTRG, we created ERC-20 wrappers for MTRG and MTR so MetaMask and dApps could treat them as ERC-20 tokens as well.
MTRG can be treated as a custom ERC20 token in Metamask:
ERC20 System Interface:
-MTRG: 0x228ebBeE999c6a7ad74A6130E81b12f9Fe237Ba3
Custom Tokens can be added to the MetaMask by below process;