Standard_E4bds_v5 is an Azure Database for PostgreSQL & MySQL size with 4 vCPUs, 32 GiB memory. In Central US it costs $0.576 per hour on demand ($420.48 per month) for PostgreSQL, Single server. It is sold in 2 regions; the cheapest is East US 2 at $0.5 per hour.
Prices by region
USD per hour, PostgreSQL, Single server. Reserved prices are no upfront, standard. Cheapest on-demand first.