diff --git a/app/Http/Controllers/Api/PostController.php b/app/Http/Controllers/Api/PostController.php
new file mode 100644
index 0000000..8032ab9
--- /dev/null
+++ b/app/Http/Controllers/Api/PostController.php
@@ -0,0 +1,63 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Http\Requests\StorePostRequest;
+use App\Http\Requests\UpdatePostRequest;
+use App\Http\Resources\PostResource;
+use App\Models\Post;
+use Illuminate\Http\Request;
+
+class PostController extends Controller
+{
+    public function index(Request $request)
+    {
+        $query = Post::query();
+
+        if ($request->filled('status')) {
+            $query->where('status', $request->string('status'));
+        }
+
+        if ($request->filled('site_id')) {
+            $query->where('site_id', $request->integer('site_id'));
+        }
+
+        if ($request->filled('social_account_id')) {
+            $query->where('social_account_id', $request->integer('social_account_id'));
+        }
+
+        if ($request->boolean('due')) {
+            $query->where('status', 'scheduled')
+                ->where('scheduled_at', '<=', now());
+        }
+
+        return PostResource::collection($query->orderByDesc('created_at')->get());
+    }
+
+    public function show(Post $post)
+    {
+        return new PostResource($post);
+    }
+
+    public function store(StorePostRequest $request)
+    {
+        $post = Post::create($request->validated())->fresh();
+
+        return (new PostResource($post))->response()->setStatusCode(201);
+    }
+
+    public function update(UpdatePostRequest $request, Post $post)
+    {
+        $post->update($request->validated());
+
+        return new PostResource($post);
+    }
+
+    public function destroy(Post $post)
+    {
+        $post->delete();
+
+        return response()->noContent();
+    }
+}
diff --git a/app/Http/Requests/StorePostRequest.php b/app/Http/Requests/StorePostRequest.php
new file mode 100644
index 0000000..0ee9d9f
--- /dev/null
+++ b/app/Http/Requests/StorePostRequest.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Models\Post;
+use Illuminate\Foundation\Http\FormRequest;
+
+class StorePostRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'site_id' => ['required', 'integer', 'exists:sites,id'],
+            'social_account_id' => ['nullable', 'integer', 'exists:social_accounts,id'],
+            'type' => ['required', 'string', 'in:' . implode(',', Post::TYPES)],
+            'title' => ['nullable', 'string', 'max:255'],
+            'body' => ['required', 'string'],
+            'status' => ['sometimes', 'string', 'in:' . implode(',', Post::STATUSES)],
+            'scheduled_at' => ['nullable', 'date'],
+        ];
+    }
+}
diff --git a/app/Http/Requests/UpdatePostRequest.php b/app/Http/Requests/UpdatePostRequest.php
new file mode 100644
index 0000000..76c24bf
--- /dev/null
+++ b/app/Http/Requests/UpdatePostRequest.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Models\Post;
+use Illuminate\Foundation\Http\FormRequest;
+
+class UpdatePostRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'site_id' => ['sometimes', 'required', 'integer', 'exists:sites,id'],
+            'social_account_id' => ['nullable', 'integer', 'exists:social_accounts,id'],
+            'type' => ['sometimes', 'required', 'string', 'in:' . implode(',', Post::TYPES)],
+            'title' => ['nullable', 'string', 'max:255'],
+            'body' => ['sometimes', 'required', 'string'],
+            'status' => ['sometimes', 'string', 'in:' . implode(',', Post::STATUSES)],
+            'scheduled_at' => ['nullable', 'date'],
+        ];
+    }
+}
diff --git a/app/Http/Resources/PostResource.php b/app/Http/Resources/PostResource.php
new file mode 100644
index 0000000..b10ebd0
--- /dev/null
+++ b/app/Http/Resources/PostResource.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Http\Resources;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+class PostResource extends JsonResource
+{
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'site_id' => $this->site_id,
+            'social_account_id' => $this->social_account_id,
+            'type' => $this->type,
+            'title' => $this->title,
+            'body' => $this->body,
+            'status' => $this->status,
+            'scheduled_at' => $this->scheduled_at,
+            'created_at' => $this->created_at,
+            'updated_at' => $this->updated_at,
+        ];
+    }
+}
diff --git a/routes/api.php b/routes/api.php
index 805fcca..949850b 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -1,5 +1,6 @@
 <?php
 
+use App\Http\Controllers\Api\PostController;
 use App\Http\Controllers\Api\SiteController;
 use App\Http\Controllers\Api\SocialAccountController;
 use Illuminate\Support\Facades\Route;
@@ -9,3 +10,5 @@ Route::get('/sites/{site}', [SiteController::class, 'show']);
 
 Route::get('/accounts', [SocialAccountController::class, 'index']);
 Route::get('/accounts/{socialAccount}', [SocialAccountController::class, 'show']);
+
+Route::apiResource('posts', PostController::class)->names('api.posts');
diff --git a/tests/Feature/Api/PostsApiTest.php b/tests/Feature/Api/PostsApiTest.php
new file mode 100644
index 0000000..0328c9a
--- /dev/null
+++ b/tests/Feature/Api/PostsApiTest.php
@@ -0,0 +1,136 @@
+<?php
+
+use App\Models\Post;
+use App\Models\Site;
+use App\Models\SocialAccount;
+
+test('it lists all posts', function () {
+    Post::factory()->count(3)->create();
+
+    $response = $this->getJson('/api/posts');
+
+    $response->assertOk()->assertJsonCount(3, 'data');
+});
+
+test('it filters posts by status', function () {
+    Post::factory()->create(['status' => 'draft']);
+    Post::factory()->create(['status' => 'published']);
+
+    $response = $this->getJson('/api/posts?status=published');
+
+    $response->assertOk()
+        ->assertJsonCount(1, 'data')
+        ->assertJsonPath('data.0.status', 'published');
+});
+
+test('it filters posts by site_id', function () {
+    $site = Site::factory()->create();
+    Post::factory()->create(['site_id' => $site->id]);
+    Post::factory()->create();
+
+    $response = $this->getJson("/api/posts?site_id={$site->id}");
+
+    $response->assertOk()->assertJsonCount(1, 'data');
+});
+
+test('it filters posts by social_account_id', function () {
+    $account = SocialAccount::factory()->create();
+    Post::factory()->create(['social_account_id' => $account->id]);
+    Post::factory()->create(['social_account_id' => null]);
+
+    $response = $this->getJson("/api/posts?social_account_id={$account->id}");
+
+    $response->assertOk()->assertJsonCount(1, 'data');
+});
+
+test('it filters posts that are due for publishing', function () {
+    Post::factory()->create(['status' => 'scheduled', 'scheduled_at' => now()->subHour()]);
+    Post::factory()->create(['status' => 'scheduled', 'scheduled_at' => now()->addDay()]);
+    Post::factory()->create(['status' => 'draft', 'scheduled_at' => now()->subHour()]);
+
+    $response = $this->getJson('/api/posts?due=1');
+
+    $response->assertOk()->assertJsonCount(1, 'data');
+});
+
+test('it shows a single post', function () {
+    $post = Post::factory()->create(['title' => 'Solo Post']);
+
+    $response = $this->getJson("/api/posts/{$post->id}");
+
+    $response->assertOk()->assertJsonPath('data.title', 'Solo Post');
+});
+
+test('it returns 404 for a missing post', function () {
+    $this->getJson('/api/posts/999')->assertNotFound();
+});
+
+test('it creates a post with required fields only', function () {
+    $site = Site::factory()->create();
+
+    $response = $this->postJson('/api/posts', [
+        'site_id' => $site->id,
+        'type' => 'blog',
+        'body' => 'New content',
+    ]);
+
+    $response->assertCreated()
+        ->assertJsonPath('data.site_id', $site->id)
+        ->assertJsonPath('data.type', 'blog')
+        ->assertJsonPath('data.body', 'New content')
+        ->assertJsonPath('data.status', 'draft');
+
+    expect(Post::where('body', 'New content')->exists())->toBeTrue();
+});
+
+test('it rejects creating a post without a valid site_id', function () {
+    $response = $this->postJson('/api/posts', [
+        'type' => 'blog',
+        'body' => 'New content',
+    ]);
+
+    $response->assertUnprocessable()->assertJsonValidationErrors(['site_id']);
+});
+
+test('it rejects creating a post without a valid type', function () {
+    $site = Site::factory()->create();
+
+    $response = $this->postJson('/api/posts', [
+        'site_id' => $site->id,
+        'type' => 'not-a-real-type',
+        'body' => 'New content',
+    ]);
+
+    $response->assertUnprocessable()->assertJsonValidationErrors(['type']);
+});
+
+test('it rejects creating a post without a body', function () {
+    $site = Site::factory()->create();
+
+    $response = $this->postJson('/api/posts', [
+        'site_id' => $site->id,
+        'type' => 'blog',
+    ]);
+
+    $response->assertUnprocessable()->assertJsonValidationErrors(['body']);
+});
+
+test('it updates a post status', function () {
+    $post = Post::factory()->create(['status' => 'scheduled']);
+
+    $response = $this->patchJson("/api/posts/{$post->id}", [
+        'status' => 'published',
+    ]);
+
+    $response->assertOk()->assertJsonPath('data.status', 'published');
+    expect($post->fresh()->status)->toBe('published');
+});
+
+test('it deletes a post', function () {
+    $post = Post::factory()->create();
+
+    $response = $this->deleteJson("/api/posts/{$post->id}");
+
+    $response->assertNoContent();
+    expect(Post::find($post->id))->toBeNull();
+});