diff --git a/app/Http/Controllers/Api/HighscoreController.php b/app/Http/Controllers/Api/HighscoreController.php
new file mode 100644
index 0000000..c712342
--- /dev/null
+++ b/app/Http/Controllers/Api/HighscoreController.php
@@ -0,0 +1,72 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Http\Requests\StoreHighscoreRequest;
+use App\Models\Highscore;
+use Carbon\CarbonImmutable;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Support\Facades\Log;
+
+class HighscoreController extends Controller
+{
+    public function index(): JsonResponse
+    {
+        // npub1pt0kw36ue3w2g4haxq3wgm6a2fhtptmzsjlc2j2vphtcgle72qesgpjyc6
+        $highscores = Highscore::query()
+            ->orderByDesc('satoshis')
+            ->orderBy('achieved_at')
+            ->get()
+            ->map(fn (Highscore $highscore) => [
+                'npub' => $highscore->npub,
+                'name' => $highscore->name,
+                'satoshis' => $highscore->satoshis,
+                'blocks' => $highscore->blocks,
+                'datetime' => $highscore->achieved_at->toIso8601String(),
+            ]);
+
+        return response()->json([
+            'data' => $highscores,
+        ]);
+    }
+
+    public function store(StoreHighscoreRequest $request): JsonResponse
+    {
+        $validated = $request->validated();
+        $achievedAt = CarbonImmutable::parse($validated['datetime']);
+
+        $highscore = Highscore::query()->firstOrNew([
+            'npub' => $validated['npub'],
+            'achieved_at' => $achievedAt,
+        ]);
+
+        $highscore->satoshis = (int) $validated['satoshis'];
+        $highscore->blocks = (int) $validated['blocks'];
+
+        if (array_key_exists('name', $validated)) {
+            $highscore->name = $validated['name'];
+        }
+
+        $highscore->save();
+
+        Log::info('Highscore submission received', [
+            'npub' => $highscore->npub,
+            'name' => $highscore->name,
+            'satoshis' => $highscore->satoshis,
+            'blocks' => $highscore->blocks,
+            'datetime' => $highscore->achieved_at->toIso8601String(),
+        ]);
+
+        return response()->json([
+            'message' => 'Highscore received',
+            'data' => [
+                'npub' => $highscore->npub,
+                'name' => $highscore->name,
+                'satoshis' => $highscore->satoshis,
+                'blocks' => $highscore->blocks,
+                'datetime' => $highscore->achieved_at->toIso8601String(),
+            ],
+        ], 202);
+    }
+}
diff --git a/app/Http/Requests/StoreHighscoreRequest.php b/app/Http/Requests/StoreHighscoreRequest.php
new file mode 100644
index 0000000..cef6520
--- /dev/null
+++ b/app/Http/Requests/StoreHighscoreRequest.php
@@ -0,0 +1,52 @@
+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class StoreHighscoreRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function expectsJson(): bool
+    {
+        return true;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'npub' => ['required', 'string', 'starts_with:npub1', 'max:100'],
+            'name' => ['nullable', 'string', 'max:255'],
+            'satoshis' => ['required', 'integer', 'min:0'],
+            'blocks' => ['required', 'integer', 'min:0'],
+            'datetime' => ['required', 'date'],
+        ];
+    }
+
+    public function messages(): array
+    {
+        return [
+            'npub.required' => 'An npub is required to record the highscore.',
+            'npub.starts_with' => 'The npub must start with npub1.',
+            'name.string' => 'The name must be a valid string.',
+            'satoshis.required' => 'Please provide the earned satoshis amount.',
+            'satoshis.integer' => 'Satoshis must be a whole number.',
+            'blocks.required' => 'Please provide the number of blocks.',
+            'blocks.integer' => 'Blocks must be a whole number.',
+            'datetime.required' => 'Please provide when the score was achieved.',
+            'datetime.date' => 'The datetime value must be a valid date.',
+        ];
+    }
+}
diff --git a/app/Models/Highscore.php b/app/Models/Highscore.php
new file mode 100644
index 0000000..19b6cfb
--- /dev/null
+++ b/app/Models/Highscore.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Highscore extends Model
+{
+    use HasFactory;
+
+    /**
+     * The attributes that aren't mass assignable.
+     *
+     * @var array
+     */
+    protected $guarded = [];
+
+    /**
+     * The attributes that should be cast to native types.
+     *
+     * @var array
+     */
+    protected $casts = [
+        'id' => 'integer',
+        'satoshis' => 'integer',
+        'blocks' => 'integer',
+        'achieved_at' => 'datetime',
+    ];
+}
diff --git a/database/factories/HighscoreFactory.php b/database/factories/HighscoreFactory.php
new file mode 100644
index 0000000..ca7b28b
--- /dev/null
+++ b/database/factories/HighscoreFactory.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace Database\Factories;
+
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/**
+ * @extends \Illuminate\Database\Eloquent\Factories\Factory<\App\Models\Highscore>
+ */
+class HighscoreFactory extends Factory
+{
+    /**
+     * Define the model's default state.
+     *
+     * @return array<string, mixed>
+     */
+    public function definition(): array
+    {
+        return [
+            'npub' => 'npub1'.fake()->regexify('[a-z0-9]{20}'),
+            'name' => fake()->name(),
+            'satoshis' => fake()->numberBetween(0, 100000),
+            'blocks' => fake()->numberBetween(0, 1000),
+            'achieved_at' => fake()->dateTimeBetween('-1 year', 'now'),
+        ];
+    }
+}
diff --git a/database/migrations/2026_02_02_105837_create_highscores_table.php b/database/migrations/2026_02_02_105837_create_highscores_table.php
new file mode 100644
index 0000000..ab8ddf7
--- /dev/null
+++ b/database/migrations/2026_02_02_105837_create_highscores_table.php
@@ -0,0 +1,35 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('highscores', function (Blueprint $table) {
+            $table->id();
+            $table->string('npub', 100);
+            $table->string('name')->nullable();
+            $table->unsignedBigInteger('satoshis');
+            $table->unsignedInteger('blocks');
+            $table->dateTime('achieved_at');
+            $table->timestamps();
+
+            $table->unique(['npub', 'achieved_at']);
+            $table->index('satoshis');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('highscores');
+    }
+};
diff --git a/routes/api.php b/routes/api.php
index c6dd9d1..3963db9 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -3,6 +3,7 @@
 use App\Http\Controllers\Api\CityController;
 use App\Http\Controllers\Api\CountryController;
 use App\Http\Controllers\Api\CourseController;
+use App\Http\Controllers\Api\HighscoreController;
 use App\Http\Controllers\Api\LecturerController;
 use App\Http\Controllers\Api\MeetupController;
 use App\Http\Controllers\Api\VenueController;
@@ -184,3 +185,6 @@ Route::get('/lnurl-auth-callback', [\App\Http\Controllers\LnurlAuthController::c
 
 Route::post('/check-auth-error', [\App\Http\Controllers\LnurlAuthController::class, 'checkError'])
     ->name('auth.check-error');
+
+Route::get('highscores', [HighscoreController::class, 'index'])->name('highscores.index');
+Route::post('highscores', [HighscoreController::class, 'store'])->name('highscores.store');
diff --git a/tests/Feature/HighscoreApiTest.php b/tests/Feature/HighscoreApiTest.php
new file mode 100644
index 0000000..a7c9431
--- /dev/null
+++ b/tests/Feature/HighscoreApiTest.php
@@ -0,0 +1,202 @@
+<?php
+
+use App\Models\Highscore;
+use Carbon\CarbonImmutable;
+
+test('highscore submission is accepted and stored', function () {
+    $payload = [
+        'npub' => 'npub1examplehighscorevalue',
+        'name' => 'Player One',
+        'satoshis' => 2100,
+        'blocks' => 5,
+        'datetime' => CarbonImmutable::now()->subMinute()->toIso8601String(),
+    ];
+
+    $response = $this->postJson(route('api.highscores.store'), $payload);
+
+    $response->assertAccepted()
+        ->assertJson([
+            'message' => 'Highscore received',
+            'data' => [
+                'npub' => $payload['npub'],
+                'name' => $payload['name'],
+                'satoshis' => $payload['satoshis'],
+                'blocks' => $payload['blocks'],
+                'datetime' => CarbonImmutable::parse($payload['datetime'])->toIso8601String(),
+            ],
+        ]);
+
+    $this->assertDatabaseHas('highscores', [
+        'npub' => $payload['npub'],
+        'name' => $payload['name'],
+        'satoshis' => $payload['satoshis'],
+        'blocks' => $payload['blocks'],
+        'achieved_at' => CarbonImmutable::parse($payload['datetime'])->toDateTimeString(),
+    ]);
+});
+
+test('highscore submission updates existing attempt for same npub and datetime', function () {
+    $datetime = CarbonImmutable::now()->subMinutes(10)->toIso8601String();
+
+    Highscore::factory()->create([
+        'npub' => 'npub1examplehighscorevalue',
+        'name' => 'Player One',
+        'satoshis' => 1000,
+        'blocks' => 3,
+        'achieved_at' => $datetime,
+    ]);
+
+    $response = $this->postJson(route('api.highscores.store'), [
+        'npub' => 'npub1examplehighscorevalue',
+        'name' => 'Player One Updated',
+        'satoshis' => 2500,
+        'blocks' => 7,
+        'datetime' => $datetime,
+    ]);
+
+    $response->assertAccepted();
+
+    $this->assertDatabaseHas('highscores', [
+        'npub' => 'npub1examplehighscorevalue',
+        'name' => 'Player One Updated',
+        'satoshis' => 2500,
+        'blocks' => 7,
+        'achieved_at' => CarbonImmutable::parse($datetime)->toDateTimeString(),
+    ]);
+    $this->assertSame(1, Highscore::query()->count());
+});
+
+test('highscore submission does not clear existing name when omitted', function () {
+    $datetime = CarbonImmutable::now()->subMinutes(15);
+
+    Highscore::factory()->create([
+        'npub' => 'npub1keepname',
+        'name' => 'Keep Name',
+        'satoshis' => 1234,
+        'blocks' => 2,
+        'achieved_at' => $datetime,
+    ]);
+
+    $response = $this->postJson(route('api.highscores.store'), [
+        'npub' => 'npub1keepname',
+        'satoshis' => 2000,
+        'blocks' => 4,
+        'datetime' => $datetime->toIso8601String(),
+    ]);
+
+    $response->assertAccepted();
+
+    $this->assertDatabaseHas('highscores', [
+        'npub' => 'npub1keepname',
+        'name' => 'Keep Name',
+        'satoshis' => 2000,
+        'blocks' => 4,
+        'achieved_at' => $datetime->toDateTimeString(),
+    ]);
+});
+
+test('highscores are returned sorted by satoshis', function () {
+    $lowest = Highscore::factory()->create([
+        'npub' => 'npub1low',
+        'name' => 'Low Player',
+        'satoshis' => 500,
+        'blocks' => 2,
+        'achieved_at' => CarbonImmutable::parse('2025-01-01T00:00:00Z'),
+    ]);
+    $middle = Highscore::factory()->create([
+        'npub' => 'npub1mid',
+        'name' => 'Mid Player',
+        'satoshis' => 1500,
+        'blocks' => 4,
+        'achieved_at' => CarbonImmutable::parse('2025-01-02T00:00:00Z'),
+    ]);
+    $highest = Highscore::factory()->create([
+        'npub' => 'npub1high',
+        'name' => 'High Player',
+        'satoshis' => 3000,
+        'blocks' => 6,
+        'achieved_at' => CarbonImmutable::parse('2025-01-03T00:00:00Z'),
+    ]);
+
+    $response = $this->getJson(route('api.highscores.index'));
+
+    $response->assertOk();
+
+    $response->assertJsonPath('data.0.npub', $highest->npub)
+        ->assertJsonPath('data.0.satoshis', $highest->satoshis)
+        ->assertJsonPath('data.0.name', $highest->name)
+        ->assertJsonPath('data.1.npub', $middle->npub)
+        ->assertJsonPath('data.2.npub', $lowest->npub);
+});
+
+dataset('invalidHighscorePayloads', [
+    'missing npub' => fn () => [
+        [
+            'satoshis' => 1000,
+            'blocks' => 3,
+            'datetime' => CarbonImmutable::now()->toIso8601String(),
+        ],
+        ['npub'],
+    ],
+    'invalid npub prefix' => fn () => [
+        [
+            'npub' => 'wrong-npub',
+            'satoshis' => 1000,
+            'blocks' => 3,
+            'datetime' => CarbonImmutable::now()->toIso8601String(),
+        ],
+        ['npub'],
+    ],
+    'non integer satoshis' => fn () => [
+        [
+            'npub' => 'npub1examplehighscorevalue',
+            'satoshis' => 'not-an-int',
+            'blocks' => 3,
+            'datetime' => CarbonImmutable::now()->toIso8601String(),
+        ],
+        ['satoshis'],
+    ],
+    'negative satoshis' => fn () => [
+        [
+            'npub' => 'npub1examplehighscorevalue',
+            'satoshis' => -1,
+            'blocks' => 3,
+            'datetime' => CarbonImmutable::now()->toIso8601String(),
+        ],
+        ['satoshis'],
+    ],
+    'non integer blocks' => fn () => [
+        [
+            'npub' => 'npub1examplehighscorevalue',
+            'satoshis' => 1000,
+            'blocks' => 'not-an-int',
+            'datetime' => CarbonImmutable::now()->toIso8601String(),
+        ],
+        ['blocks'],
+    ],
+    'negative blocks' => fn () => [
+        [
+            'npub' => 'npub1examplehighscorevalue',
+            'satoshis' => 1000,
+            'blocks' => -1,
+            'datetime' => CarbonImmutable::now()->toIso8601String(),
+        ],
+        ['blocks'],
+    ],
+    'invalid datetime' => fn () => [
+        [
+            'npub' => 'npub1examplehighscorevalue',
+            'satoshis' => 1000,
+            'blocks' => 3,
+            'datetime' => 'not a date',
+        ],
+        ['datetime'],
+    ],
+]);
+
+it('validates highscore payload', function (array $payload, array $invalidFields) {
+    $response = $this->postJson(route('api.highscores.store'), $payload);
+
+    $response->assertUnprocessable()
+        ->assertInvalid($invalidFields);
+})->with('invalidHighscorePayloads');