@polkadot/types/interfaces/ormlTokens/runtime.js

export const runtime = {
    // https://github.com/open-web3-stack/open-runtime-module-library/blob/b57f88b39cd547e2fb51727d8bb9bcc64fddf8b5/tokens/rpc/runtime-api/src/lib.rs#L11-L18
    TokensApi: [
        {
            methods: {
                query_existential_deposit: {
                    description: 'Query the existential amount for a specific currency',
                    params: [
                        {
                            name: 'currencyId',
                            // This is CurrencyId, as per the return value, we are unsure
                            // if this is specialized and/or global to the chain or not
                            type: 'Raw'
                        }
                    ],
                    // This is Balance - since we don't understand enough about the way
                    // in which this is used, we default to u128 here (it certainly could
                    // be a specialized type that doesn't map to the on-chain Balance)
                    type: 'u128'
                }
            },
            version: 1
        }
    ]
};