
Welcome to ET.
It depends what you mean by "market".
If you're trading spot forex against a counterparty "forex broker", it's their own product's volatility that's perhaps relevant to you, since that's the one you're trading? Some brokers give volume "information" (but it's only their own volume - which may have very little to do with the interbank spot forex market, for which such parameters are not monitorable because there's no centralized exchange).
Is the volume done through Oanda large enough to be a reliable indicator of relative volume for the overall spot forex market?