diff --git a/BibliotecaDigitalApi/Program.cs b/BibliotecaDigitalApi/Program.cs
index 00ff539..172964c 100644
--- a/BibliotecaDigitalApi/Program.cs
+++ b/BibliotecaDigitalApi/Program.cs
@@ -1,13 +1,17 @@
+using BibliotecaAPI.Data;
+using Microsoft.EntityFrameworkCore;
+
 var builder = WebApplication.CreateBuilder(args);
 
-// Add services to the container.
-// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
+
+
+builder.Services.AddControllers();
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
 
 var app = builder.Build();
 
-// Configure the HTTP request pipeline.
+// Activar Swagger para probar endpoints
 if (app.Environment.IsDevelopment())
 {
     app.UseSwagger();
@@ -15,30 +19,7 @@ if (app.Environment.IsDevelopment())
 }
 
 app.UseHttpsRedirection();
+app.UseAuthorization();
+app.MapControllers();
 
-var summaries = new[]
-{
-    "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
-};
-
-app.MapGet("/weatherforecast", () =>
-{
-    var forecast =  Enumerable.Range(1, 5).Select(index =>
-        new WeatherForecast
-        (
-            DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
-            Random.Shared.Next(-20, 55),
-            summaries[Random.Shared.Next(summaries.Length)]
-        ))
-        .ToArray();
-    return forecast;
-})
-.WithName("GetWeatherForecast")
-.WithOpenApi();
-
-app.Run();
-
-record WeatherForecast(DateOnly Date, int TemperatureC, string? Summary)
-{
-    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
-}
+app.Run();
\ No newline at end of file
diff --git a/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.AssemblyInfo.cs b/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.AssemblyInfo.cs
index 14074d1..2448c22 100644
--- a/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.AssemblyInfo.cs
+++ b/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.AssemblyInfo.cs
@@ -13,10 +13,10 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("BibliotecaDigitalApi")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+7b037ee7692fed1179b172f2163d0f866cb8e57d")]
 [assembly: System.Reflection.AssemblyProductAttribute("BibliotecaDigitalApi")]
 [assembly: System.Reflection.AssemblyTitleAttribute("BibliotecaDigitalApi")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
 
-// Generated by the MSBuild WriteCodeFragment class.
+// Generado por la clase WriteCodeFragment de MSBuild.
 
diff --git a/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.AssemblyInfoInputs.cache b/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.AssemblyInfoInputs.cache
index 21b5fed..a8c9c26 100644
--- a/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.AssemblyInfoInputs.cache
+++ b/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.AssemblyInfoInputs.cache
@@ -1 +1 @@
-6ed0a80a11b43174ad50914035db8ef21ed9a2256f21b1d4e57a6b5c8f6a8e18
+fe9b27aa300c3789229c7b6b1cb8aa68e1db82d30fd78e439c90942c46816c80
diff --git a/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.MvcApplicationPartsAssemblyInfo.cache b/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.MvcApplicationPartsAssemblyInfo.cache
new file mode 100644
index 0000000..e69de29
diff --git a/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.MvcApplicationPartsAssemblyInfo.cs b/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.MvcApplicationPartsAssemblyInfo.cs
new file mode 100644
index 0000000..9fe4d8c
--- /dev/null
+++ b/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.MvcApplicationPartsAssemblyInfo.cs
@@ -0,0 +1,17 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: Microsoft.AspNetCore.Mvc.ApplicationParts.ApplicationPartAttribute("Microsoft.AspNetCore.OpenApi")]
+[assembly: Microsoft.AspNetCore.Mvc.ApplicationParts.ApplicationPartAttribute("Swashbuckle.AspNetCore.SwaggerGen")]
+
+// Generado por la clase WriteCodeFragment de MSBuild.
+
diff --git a/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.csproj.CoreCompileInputs.cache b/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.csproj.CoreCompileInputs.cache
new file mode 100644
index 0000000..26ec213
--- /dev/null
+++ b/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.csproj.CoreCompileInputs.cache
@@ -0,0 +1 @@
+90de409f17a71d4aa851b14ec70bdf8c6d47c7ea53281b0480308c94120b5983
diff --git a/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.csproj.FileListAbsolute.txt b/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.csproj.FileListAbsolute.txt
new file mode 100644
index 0000000..b03a08e
--- /dev/null
+++ b/BibliotecaDigitalApi/obj/Debug/net8.0/BibliotecaDigitalApi.csproj.FileListAbsolute.txt
@@ -0,0 +1,7 @@
+C:\Users\CHIOH\source\repos\BibliotecaDigital\BibliotecaDigitalApi\obj\Debug\net8.0\BibliotecaDigitalApi.csproj.AssemblyReference.cache
+C:\Users\CHIOH\source\repos\BibliotecaDigital\BibliotecaDigitalApi\obj\Debug\net8.0\BibliotecaDigitalApi.GeneratedMSBuildEditorConfig.editorconfig
+C:\Users\CHIOH\source\repos\BibliotecaDigital\BibliotecaDigitalApi\obj\Debug\net8.0\BibliotecaDigitalApi.AssemblyInfoInputs.cache
+C:\Users\CHIOH\source\repos\BibliotecaDigital\BibliotecaDigitalApi\obj\Debug\net8.0\BibliotecaDigitalApi.AssemblyInfo.cs
+C:\Users\CHIOH\source\repos\BibliotecaDigital\BibliotecaDigitalApi\obj\Debug\net8.0\BibliotecaDigitalApi.csproj.CoreCompileInputs.cache
+C:\Users\CHIOH\source\repos\BibliotecaDigital\BibliotecaDigitalApi\obj\Debug\net8.0\BibliotecaDigitalApi.MvcApplicationPartsAssemblyInfo.cs
+C:\Users\CHIOH\source\repos\BibliotecaDigital\BibliotecaDigitalApi\obj\Debug\net8.0\BibliotecaDigitalApi.MvcApplicationPartsAssemblyInfo.cache
diff --git a/Models/BibliotecaContext.cs b/Models/BibliotecaContext.cs
new file mode 100644
index 0000000..67adabf
--- /dev/null
+++ b/Models/BibliotecaContext.cs
@@ -0,0 +1,14 @@
+using Microsoft.EntityFrameworkCore;
+using BibliotecaAPI.Models;
+
+namespace BibliotecaAPI.Data
+{
+    public class BibliotecaContext : DbContext
+    {
+        public BibliotecaContext(DbContextOptions<BibliotecaContext> options) : base(options) { }
+
+        public DbSet<Libro> Libros { get; set; }
+        public DbSet<Usuario> Usuarios { get; set; }
+        public DbSet<Prestamo> Prestamos { get; set; }
+    }
+}
diff --git a/Models/Libro.cs b/Models/Libro.cs
new file mode 100644
index 0000000..e78f443
--- /dev/null
+++ b/Models/Libro.cs
@@ -0,0 +1,16 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace BibliotecaAPI.Models
+{
+    public class Libro
+    {
+        [Key]
+        public int Id { get; set; }
+        public string Titulo { get; set; } = string.Empty;
+        public string Autor { get; set; } = string.Empty;
+        public string ISBN { get; set; } = string.Empty;
+        public int Año { get; set; }
+        public string Categoria { get; set; } = string.Empty;
+        public int CopiasDisponibles { get; set; }
+    }
+}
diff --git a/Models/Prestamo.cs b/Models/Prestamo.cs
new file mode 100644
index 0000000..37a93cb
--- /dev/null
+++ b/Models/Prestamo.cs
@@ -0,0 +1,24 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace BibliotecaAPI.Models
+{
+    public class Prestamo
+    {
+        [Key]
+        public int Id { get; set; }
+
+        [ForeignKey("Usuario")]
+        public int UsuarioId { get; set; }
+        public Usuario? Usuario { get; set; }
+
+        [ForeignKey("Libro")]
+        public int LibroId { get; set; }
+        public Libro? Libro { get; set; }
+
+        public DateTime FechaPrestamo { get; set; } = DateTime.Now;
+        public DateTime? FechaDevolucion { get; set; }
+        public bool Devuelto { get; set; } = false;
+    }
+}
diff --git a/Models/Usuario.cs b/Models/Usuario.cs
new file mode 100644
index 0000000..0b57a67
--- /dev/null
+++ b/Models/Usuario.cs
@@ -0,0 +1,12 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace BibliotecaAPI.Models
+{
+    public class Usuario
+    {
+        [Key]
+        public int Id { get; set; }
+        public string Nombre { get; set; } = string.Empty;
+        public string Email { get; set; } = string.Empty;
+    }
+}
diff --git a/controllers/LibrosController.cs b/controllers/LibrosController.cs
new file mode 100644
index 0000000..6778f0d
--- /dev/null
+++ b/controllers/LibrosController.cs
@@ -0,0 +1,60 @@
+using Microsoft.AspNetCore.Mvc;
+using BibliotecaAPI.Data;
+using BibliotecaAPI.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace BibliotecaAPI.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class LibrosController : ControllerBase
+    {
+        private readonly BibliotecaContext _context;
+
+        public LibrosController(BibliotecaContext context)
+        {
+            _context = context;
+        }
+
+        [HttpGet]
+        public async Task<ActionResult<IEnumerable<Libro>>> GetLibros()
+        {
+            return await _context.Libros.ToListAsync();
+        }
+
+        [HttpGet("{id}")]
+        public async Task<ActionResult<Libro>> GetLibro(int id)
+        {
+            var libro = await _context.Libros.FindAsync(id);
+            if (libro == null) return NotFound();
+            return libro;
+        }
+
+        [HttpPost]
+        public async Task<ActionResult<Libro>> PostLibro(Libro libro)
+        {
+            _context.Libros.Add(libro);
+            await _context.SaveChangesAsync();
+            return CreatedAtAction(nameof(GetLibro), new { id = libro.Id }, libro);
+        }
+
+        [HttpPut("{id}")]
+        public async Task<IActionResult> PutLibro(int id, Libro libro)
+        {
+            if (id != libro.Id) return BadRequest();
+            _context.Entry(libro).State = EntityState.Modified;
+            await _context.SaveChangesAsync();
+            return NoContent();
+        }
+
+        [HttpDelete("{id}")]
+        public async Task<IActionResult> DeleteLibro(int id)
+        {
+            var libro = await _context.Libros.FindAsync(id);
+            if (libro == null) return NotFound();
+            _context.Libros.Remove(libro);
+            await _context.SaveChangesAsync();
+            return NoContent();
+        }
+    }
+}
diff --git a/controllers/PrestamosController.cs b/controllers/PrestamosController.cs
new file mode 100644
index 0000000..44d1a30
--- /dev/null
+++ b/controllers/PrestamosController.cs
@@ -0,0 +1,82 @@
+using Microsoft.AspNetCore.Mvc;
+using BibliotecaAPI.Data;
+using BibliotecaAPI.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace BibliotecaAPI.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class PrestamosController : ControllerBase
+    {
+        private readonly BibliotecaContext _context;
+
+        public PrestamosController(BibliotecaContext context)
+        {
+            _context = context;
+        }
+
+        // Crear préstamo
+        [HttpPost("crear")]
+        public async Task<ActionResult<Prestamo>> CrearPrestamo(Prestamo prestamo)
+        {
+            var libro = await _context.Libros.FindAsync(prestamo.LibroId);
+            if (libro == null || libro.CopiasDisponibles <= 0)
+                return BadRequest("Libro no disponible.");
+
+            libro.CopiasDisponibles--;
+            _context.Prestamos.Add(prestamo);
+            await _context.SaveChangesAsync();
+
+            return Ok(prestamo);
+        }
+
+        // Registrar devolución
+        [HttpPut("devolver/{id}")]
+        public async Task<IActionResult> RegistrarDevolucion(int id)
+        {
+            var prestamo = await _context.Prestamos.Include(p => p.Libro).FirstOrDefaultAsync(p => p.Id == id);
+            if (prestamo == null) return NotFound();
+
+            prestamo.Devuelto = true;
+            prestamo.FechaDevolucion = DateTime.Now;
+            prestamo.Libro.CopiasDisponibles++;
+            await _context.SaveChangesAsync();
+
+            return Ok("Devolución registrada con éxito.");
+        }
+
+        // Consultar préstamos activos
+        [HttpGet("activos")]
+        public async Task<ActionResult<IEnumerable<Prestamo>>> GetActivos()
+        {
+            return await _context.Prestamos
+                .Include(p => p.Libro)
+                .Include(p => p.Usuario)
+                .Where(p => !p.Devuelto)
+                .ToListAsync();
+        }
+
+        // Consultar préstamos vencidos (más de 15 días)
+        [HttpGet("vencidos")]
+        public async Task<ActionResult<IEnumerable<Prestamo>>> GetVencidos()
+        {
+            var hoy = DateTime.Now;
+            return await _context.Prestamos
+                .Include(p => p.Libro)
+                .Include(p => p.Usuario)
+                .Where(p => !p.Devuelto && (hoy - p.FechaPrestamo).TotalDays > 15)
+                .ToListAsync();
+        }
+
+        // Historial por usuario
+        [HttpGet("historial/{usuarioId}")]
+        public async Task<ActionResult<IEnumerable<Prestamo>>> GetHistorialUsuario(int usuarioId)
+        {
+            return await _context.Prestamos
+                .Include(p => p.Libro)
+                .Where(p => p.UsuarioId == usuarioId)
+                .ToListAsync();
+        }
+    }
+}
diff --git a/controllers/UsuariosController.cs b/controllers/UsuariosController.cs
new file mode 100644
index 0000000..8a44d32
--- /dev/null
+++ b/controllers/UsuariosController.cs
@@ -0,0 +1,33 @@
+using Microsoft.AspNetCore.Mvc;
+using BibliotecaAPI.Data;
+using BibliotecaAPI.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace BibliotecaAPI.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class UsuariosController : ControllerBase
+    {
+        private readonly BibliotecaContext _context;
+
+        public UsuariosController(BibliotecaContext context)
+        {
+            _context = context;
+        }
+
+        [HttpGet]
+        public async Task<ActionResult<IEnumerable<Usuario>>> GetUsuarios()
+        {
+            return await _context.Usuarios.ToListAsync();
+        }
+
+        [HttpPost]
+        public async Task<ActionResult<Usuario>> PostUsuario(Usuario usuario)
+        {
+            _context.Usuarios.Add(usuario);
+            await _context.SaveChangesAsync();
+            return CreatedAtAction(nameof(GetUsuarios), new { id = usuario.Id }, usuario);
+        }
+    }
+}