return new Promise<number>(async (resolve, reject) => {
		try {
			const usdStr = await xemUSDValue();
			const usdVal = parseFloat(usdStr);
			resolve(precisionRound((usdVal * xemAmount) / 1e6, 2));
		} catch (err) {
			reject(err);
		}
	});

	return new Promise<number>(async (resolve, reject) => {
		try {
			const xemEquivalent = ((XEM_MARKET_CAP * (tokenAmount * 1e6)) / CHE_TOTAL_QUANTITY) / 1e4;
			const unweightedFee = Math.abs(xemEquivalent - SUPPLY_RELATED_ADJUSTMENT);
			let fee = precisionRound(unweightedFee * 0.05, 6);
			if (fee >= 1.25) { fee = 1.25; }
			resolve(fee);
		} catch (err) {
			reject(err);
		}
	});

	api.get('/tokens-sold', async (req: Request, res: Response) => {
		try {
			const usdTotals: Array<UsdTotal> = await findAll<UsdTotal>(DB_USD_TOTALS);
			if (req.query.currency === 'usd' && usdTotals.length > 0) {
				return res.send({amount: precisionRound(usdTotals[0].currentRaised, 2), milestone: usdTotals[0].nextMilestone });
			}
			res.status(409).json({ message: 'object or parameter not found.'});
		} catch (err) {
			res.status(409).json(err);
		}
	});

	return new Promise<any>(async (resolve, reject) => {
		try {
			const senderAddress = new Address(req.body.tokenRecipientAddress).plain();
			const createdDate = new Date();
			const hashId = await generateHashId(senderAddress, createdDate.toISOString());
			const product = await findById<Product>(DB_PRODUCTS, req.body.productId);
			const quotedAmount = await usdToXem(product.priceUSD);
			const data: XemTransaction = {
				_id: new ObjectID(),
				tokenRecipientAddress: senderAddress,
				tokenType: req.body.tokenType,
				productId: product._id,
				totalPaid: 0,
				quotedAmount: precisionRound(quotedAmount * 1e6, 0),
				usdPaid: 0,
				message: MESSAGE_PREFIX + hashId,
				createdAt: createdDate
			};
			await saveWithId<XemTransaction>(DB_PENDING_XEM_CHARGES, data);
			resolve({tokenRecipientAddress: tokenHoldingAccountAddress(), message: data.message, usdValue: product.priceUSD, xemAmount: precisionRound(quotedAmount, 6)});
		} catch (err) {
			reject(err);
		}
	});