# Using Terra Classic¶

Terra.js can be configured to work with Terra Classic by passing a boolean isClassic value to the LCD.

## LCDClient¶

const gasPrices = await(
await fetch("https://columbus-api.terra.dev/gas-prices", {
redirect: "follow",
})
).json();

const gasPricesCoins = new Coins(gasPrices);

const lcd = new LCDClient({
URL: "https://columbus-lcd.terra.dev/",
chainID: "columbus-5",
gasPrices: gasPricesCoins,
gas: 10000000,
isClassic: true, // false by default, change to true if you want to interact with Terra Classic
});


## Conversion Functions¶

The isClassic boolean can also be specified for most unit conversion functions in Terra.js. If unspecified, these methods will simply use the Luna version specified in the LCD config. The following are two examples of methods that accept this boolean value.

public toAmino(isClassic?: boolean)
public fromData(isClassic?: boolean)


## Signing Messages with Keys¶

Wallet objects on Terra contain information about the LCDClient, so they inherit the isClassic parameter automatically. However, key objects, such as MnemonicKey, RawKey or CLIKey do not. For example, createSignatureAmino is a method where you can specify if you’d like to use Terra Classic.

 public async createSignatureAmino(
tx: SignDoc,
isClassic?: boolean
): Promise<SignatureV2> { ... }