public class ConversionRate
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public long Id { get; set; }

        [Required]
        public string FromCurrency { get; set; }

        [Required]
        public string ToCurrency { get; set; }

        [Required]
        [Range(0, 100000)]
        public double Value { get; set; }

        [Required]
        public DateTime Date { get; set; }

        [ForeignKey("ProviderId")]
        public Provider Provider { get; set; }
        public int ProviderId { get; set; }
    }

public class RateDto
    {
        public DateTime Date { get; set; }
        public double Value { get; set; }
    }

public class ConversionRateProfile : Profile
    {
        public ConversionRateProfile()
        {
            CreateMap<ConversionRate, RateDto>();
            CreateMap<RateDto, ConversionRate>();

        }
    }

Unmapped properties:
Id
FromCurrency
ToCurrency
Provider
ProviderId