Have you tried these?
But of course, always do care about reading their terms as you can see dYdX has a restriction on the US citizen or resident, or physically located at in said place.
If dYdX restrict U.S. citizens to access their site, it's mean it's not 100% decentralized since they can take a part to control the customers that use their site.
On their
terms it said that the restricted places are,
"You are not permitted to access the Portal or the Services if you are a citizen or resident of, or physically located in, any of the following jurisdictions: Burma, Cote D'Ivoire (Ivory Coast), Cuba, Democratic Republic of Congo, Iran, Iraq, Libya, Mali, Nicaragua, Democratic People’s Republic of Korea (North Korea), Somalia, Sudan, Syria, Yemen, Zimbabwe, or any other state, country or region that is subject to sanctions enforced by the US Office of Foreign Asset Compliance. You must not use any software or networking techniques, including use of a Virtual Private Network (VPN) to modify your internet protocol address or otherwise circumvent or attempt to circumvent this prohibition."Always do care reading terms which is even we know they're decentralized exchange.