diff --git a/PLAN.md b/PLAN.md
index 79c18bc..b4e5e44 100644
--- a/PLAN.md
+++ b/PLAN.md
@@ -95,17 +95,17 @@ A self-hosted error tracking application (inspired by [Bugsink](https://www.bugs
 
 Implement a `/api/{project_id}/store/` endpoint that accepts the Sentry event payload format. This allows using existing Sentry SDKs (for PHP, JS, Python, etc.) as clients without any custom SDK work.
 
-- [ ] `POST /api/{project_id}/store/` route
-- [ ] Validate DSN public key via `sentry_key` query param or `X-Sentry-Auth` header
-- [ ] `AuthenticateDsn` middleware
-- [ ] `EventIngestController`
+- [x] `POST /api/{project_id}/store/` route
+- [x] Validate DSN public key via `sentry_key` query param or `X-Sentry-Auth` header
+- [x] `AuthenticateDsn` middleware
+- [x] `EventIngestController`
 
 ### 2.2 Event Processing Pipeline
 
-- [ ] `ProcessEventJob` (queued)
-- [ ] `PayloadNormalizer` service
-- [ ] `EventProcessor` service (find or create Issue, store Event, update counters)
-- [ ] Regression detection (re-open resolved issues)
+- [x] `ProcessEventJob` (queued)
+- [x] `PayloadNormalizer` service
+- [x] `EventProcessor` service (find or create Issue, store Event, update counters)
+- [x] Regression detection (re-open resolved issues)
 
 ```
 Ingest Request
@@ -122,7 +122,7 @@ Ingest Request
 
 ### 2.3 Fingerprinting / Grouping Strategy
 
-- [ ] `Fingerprinter` service
+- [x] `Fingerprinter` service
 
 Group events into issues using a fingerprint hash built from:
 1. Exception type (class name)
@@ -238,8 +238,8 @@ Clients configure this DSN in their Sentry SDK — no changes needed on the SDK
 - [x] 1. Install Breeze, set up auth
 - [x] 2. Create migrations for `projects`, `issues`, `events`, `project_user`
 - [x] 3. Build models with relationships
-- [ ] 4. Build the ingest endpoint (`POST /api/{project_id}/store/`)
-- [ ] 5. Implement fingerprinting and the `ProcessEventJob`
+- [x] 4. Build the ingest endpoint (`POST /api/{project_id}/store/`)
+- [x] 5. Implement fingerprinting and the `ProcessEventJob`
 - [ ] 6. Build a minimal issues list page and issue detail page
 - [ ] 7. Test with a real Sentry SDK (e.g. `sentry/sentry-laravel` on another app pointing at this tracker)
 
diff --git a/app/Http/Controllers/Api/EventIngestController.php b/app/Http/Controllers/Api/EventIngestController.php
new file mode 100644
index 0000000..83407da
--- /dev/null
+++ b/app/Http/Controllers/Api/EventIngestController.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Jobs\ProcessEventJob;
+use App\Models\Project;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+class EventIngestController extends Controller
+{
+    public function store(Request $request, Project $project): JsonResponse
+    {
+        $payload = $request->json()->all();
+
+        if (empty($payload)) {
+            return response()->json(['error' => 'Empty payload'], 400);
+        }
+
+        ProcessEventJob::dispatch($project, $payload);
+
+        return response()->json(
+            ['id' => $payload['event_id'] ?? null],
+            202,
+        );
+    }
+}
diff --git a/app/Http/Middleware/AuthenticateDsn.php b/app/Http/Middleware/AuthenticateDsn.php
new file mode 100644
index 0000000..0afd9eb
--- /dev/null
+++ b/app/Http/Middleware/AuthenticateDsn.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use App\Models\Project;
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+class AuthenticateDsn
+{
+    public function handle(Request $request, Closure $next): Response
+    {
+        $project = $request->route('project');
+
+        if (! $project instanceof Project) {
+            abort(404, 'Project not found.');
+        }
+
+        $sentryKey = $this->extractSentryKey($request);
+
+        if (! $sentryKey || $sentryKey !== $project->dsn_public_key) {
+            abort(401, 'Invalid DSN key.');
+        }
+
+        return $next($request);
+    }
+
+    /**
+     * Extract the sentry_key from the query string or X-Sentry-Auth header.
+     *
+     * Header format: Sentry sentry_version=7, sentry_client=..., sentry_key=<key>
+     */
+    private function extractSentryKey(Request $request): ?string
+    {
+        if ($key = $request->query('sentry_key')) {
+            return $key;
+        }
+
+        $header = $request->header('X-Sentry-Auth', '');
+
+        if (preg_match('/sentry_key=([a-f0-9\-]+)/i', $header, $matches)) {
+            return $matches[1];
+        }
+
+        return null;
+    }
+}
diff --git a/app/Jobs/ProcessEventJob.php b/app/Jobs/ProcessEventJob.php
new file mode 100644
index 0000000..13cbce4
--- /dev/null
+++ b/app/Jobs/ProcessEventJob.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Jobs;
+
+use App\Models\Project;
+use App\Services\EventProcessor;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Support\Facades\Log;
+
+class ProcessEventJob implements ShouldQueue
+{
+    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+
+    public int $tries = 3;
+
+    public int $backoff = 5;
+
+    public function __construct(
+        public Project $project,
+        public array $rawPayload,
+    ) {}
+
+    public function handle(EventProcessor $processor): void
+    {
+        $processor->process($this->project, $this->rawPayload);
+    }
+
+    public function failed(\Throwable $exception): void
+    {
+        Log::error('Failed to process event', [
+            'project_id' => $this->project->id,
+            'event_id' => $this->rawPayload['event_id'] ?? 'unknown',
+            'error' => $exception->getMessage(),
+        ]);
+    }
+}
diff --git a/app/Services/EventProcessor.php b/app/Services/EventProcessor.php
new file mode 100644
index 0000000..9936015
--- /dev/null
+++ b/app/Services/EventProcessor.php
@@ -0,0 +1,150 @@
+<?php
+
+namespace App\Services;
+
+use App\Models\Event;
+use App\Models\Issue;
+use App\Models\Project;
+use Illuminate\Support\Carbon;
+
+class EventProcessor
+{
+    public function __construct(
+        private Fingerprinter $fingerprinter,
+        private PayloadNormalizer $normalizer,
+    ) {}
+
+    /**
+     * Process a raw Sentry event payload for the given project.
+     * Returns the created Event model.
+     */
+    public function process(Project $project, array $rawPayload): Event
+    {
+        $data = $this->normalizer->normalize($rawPayload);
+        $fingerprint = $this->fingerprinter->compute($rawPayload);
+        $now = Carbon::now();
+
+        $issue = $this->findOrCreateIssue($project, $data, $fingerprint, $now);
+
+        $event = Event::create([
+            'issue_id' => $issue->id,
+            'project_id' => $project->id,
+            'event_id' => $data['event_id'],
+            'level' => $data['level'],
+            'message' => $data['message'],
+            'platform' => $data['platform'],
+            'timestamp' => $data['timestamp'],
+            'server_name' => $data['server_name'],
+            'release' => $data['release'],
+            'environment' => $data['environment'],
+            'exception' => $data['exception'],
+            'breadcrumbs' => $data['breadcrumbs'],
+            'contexts' => $data['contexts'],
+            'tags' => $data['tags'],
+            'extra' => $data['extra'],
+            'user_context' => $data['user_context'],
+            'request_context' => $data['request_context'],
+            'sdk' => $data['sdk'],
+            'raw_payload' => $rawPayload,
+        ]);
+
+        return $event;
+    }
+
+    private function findOrCreateIssue(
+        Project $project,
+        array $data,
+        string $fingerprint,
+        Carbon $now,
+    ): Issue {
+        $issue = Issue::where('project_id', $project->id)
+            ->where('fingerprint', $fingerprint)
+            ->first();
+
+        if ($issue) {
+            $this->updateExistingIssue($issue, $data, $now);
+
+            return $issue;
+        }
+
+        return $this->createNewIssue($project, $data, $fingerprint, $now);
+    }
+
+    private function createNewIssue(
+        Project $project,
+        array $data,
+        string $fingerprint,
+        Carbon $now,
+    ): Issue {
+        $exception = $this->fingerprinter->extractPrimaryException(
+            ['exception' => $data['exception']],
+        );
+
+        $title = $this->buildTitle($exception, $data['message']);
+        $culprit = $this->buildCulprit($exception);
+
+        return Issue::create([
+            'project_id' => $project->id,
+            'fingerprint' => $fingerprint,
+            'title' => $title,
+            'culprit' => $culprit,
+            'level' => $data['level'],
+            'status' => 'unresolved',
+            'first_seen_at' => $now,
+            'last_seen_at' => $now,
+            'times_seen' => 1,
+            'is_regression' => false,
+            'metadata' => array_filter([
+                'platform' => $data['platform'],
+                'sdk' => $data['sdk'],
+            ]),
+        ]);
+    }
+
+    private function updateExistingIssue(Issue $issue, array $data, Carbon $now): void
+    {
+        $wasResolved = $issue->status === 'resolved';
+
+        $issue->increment('times_seen');
+        $issue->update(['last_seen_at' => $now]);
+
+        if ($wasResolved) {
+            $issue->markRegression();
+        }
+    }
+
+    private function buildTitle(?array $exception, ?string $message): string
+    {
+        if ($exception) {
+            $type = $exception['type'] ?? 'Error';
+            $value = $exception['value'] ?? '';
+
+            return str($value)
+                ->whenEmpty(fn () => str($type))
+                ->prepend("{$type}: ")
+                ->limit(255)
+                ->toString();
+        }
+
+        return str($message ?? 'Unknown Error')->limit(255)->toString();
+    }
+
+    private function buildCulprit(?array $exception): ?string
+    {
+        if (! $exception) {
+            return null;
+        }
+
+        $frames = $exception['stacktrace']['frames'] ?? [];
+        $last = end($frames);
+
+        if (! $last) {
+            return null;
+        }
+
+        $file = $last['filename'] ?? $last['abs_path'] ?? '?';
+        $function = $last['function'] ?? null;
+
+        return $function ? "{$file} in {$function}" : $file;
+    }
+}
diff --git a/app/Services/Fingerprinter.php b/app/Services/Fingerprinter.php
new file mode 100644
index 0000000..3e5d77f
--- /dev/null
+++ b/app/Services/Fingerprinter.php
@@ -0,0 +1,85 @@
+<?php
+
+namespace App\Services;
+
+class Fingerprinter
+{
+    /**
+     * Compute a fingerprint hash for grouping events into issues.
+     *
+     * If the payload contains a custom `fingerprint` array (Sentry SDK standard),
+     * that takes precedence. Otherwise we derive one from exception type, a
+     * sanitized message, and the top stacktrace frames.
+     */
+    public function compute(array $payload): string
+    {
+        if (! empty($payload['fingerprint']) && is_array($payload['fingerprint'])) {
+            return $this->hash($payload['fingerprint']);
+        }
+
+        $parts = [];
+
+        $exception = $this->extractPrimaryException($payload);
+
+        if ($exception) {
+            $parts[] = $exception['type'] ?? '';
+            $parts[] = $this->sanitizeMessage($exception['value'] ?? '');
+            $parts = array_merge($parts, $this->topFrames($exception, 5));
+        } else {
+            $parts[] = $payload['message'] ?? $payload['logentry']['message'] ?? 'unknown';
+        }
+
+        return $this->hash($parts);
+    }
+
+    public function extractPrimaryException(array $payload): ?array
+    {
+        $exceptions = $payload['exception']['values'] ?? [];
+
+        return end($exceptions) ?: null;
+    }
+
+    /**
+     * Strip variable parts (numbers, UUIDs, hex strings) so that
+     * "User 42 not found" and "User 99 not found" group together.
+     */
+    private function sanitizeMessage(string $message): string
+    {
+        $message = preg_replace(
+            '/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/i',
+            '{uuid}',
+            $message,
+        );
+
+        $message = preg_replace('/\b[0-9a-f]{24,}\b/i', '{hash}', $message);
+
+        $message = preg_replace('/\b\d+\b/', '{n}', $message);
+
+        return $message;
+    }
+
+    /**
+     * Return file+function strings from the top N stacktrace frames.
+     */
+    private function topFrames(array $exception, int $limit): array
+    {
+        $frames = $exception['stacktrace']['frames'] ?? [];
+
+        $frames = array_reverse($frames);
+        $frames = array_slice($frames, 0, $limit);
+
+        $parts = [];
+        foreach ($frames as $frame) {
+            $file = $frame['filename'] ?? $frame['abs_path'] ?? '';
+            $function = $frame['function'] ?? '';
+            $parts[] = "{$file}:{$function}";
+        }
+
+        return $parts;
+    }
+
+    private function hash(array $parts): string
+    {
+        return md5(implode("\x00", $parts));
+    }
+}
diff --git a/app/Services/PayloadNormalizer.php b/app/Services/PayloadNormalizer.php
new file mode 100644
index 0000000..daf4ec8
--- /dev/null
+++ b/app/Services/PayloadNormalizer.php
@@ -0,0 +1,111 @@
+<?php
+
+namespace App\Services;
+
+use Illuminate\Support\Carbon;
+use Illuminate\Support\Str;
+
+class PayloadNormalizer
+{
+    /**
+     * Normalize a raw Sentry event payload into the canonical shape
+     * expected by the EventProcessor.
+     */
+    public function normalize(array $raw): array
+    {
+        return [
+            'event_id' => $raw['event_id'] ?? Str::uuid()->toString(),
+            'level' => $this->normalizeLevel($raw['level'] ?? 'error'),
+            'message' => $this->extractMessage($raw),
+            'platform' => $raw['platform'] ?? null,
+            'timestamp' => $this->normalizeTimestamp($raw['timestamp'] ?? null),
+            'server_name' => $raw['server_name'] ?? null,
+            'release' => $raw['release'] ?? null,
+            'environment' => $raw['environment'] ?? null,
+            'exception' => $raw['exception'] ?? ['values' => []],
+            'breadcrumbs' => $raw['breadcrumbs'] ?? null,
+            'contexts' => $raw['contexts'] ?? null,
+            'tags' => $this->normalizeTags($raw['tags'] ?? null),
+            'extra' => $raw['extra'] ?? null,
+            'user_context' => $raw['user'] ?? null,
+            'request_context' => $raw['request'] ?? null,
+            'sdk' => $raw['sdk'] ?? null,
+            'fingerprint' => $raw['fingerprint'] ?? null,
+        ];
+    }
+
+    private function normalizeLevel(string $level): string
+    {
+        $map = [
+            'fatal' => 'fatal',
+            'critical' => 'fatal',
+            'error' => 'error',
+            'warning' => 'warning',
+            'warn' => 'warning',
+            'info' => 'info',
+            'log' => 'info',
+            'debug' => 'debug',
+        ];
+
+        return $map[strtolower($level)] ?? 'error';
+    }
+
+    private function extractMessage(array $raw): ?string
+    {
+        if (! empty($raw['message'])) {
+            return Str::limit($raw['message'], 2000);
+        }
+
+        if (! empty($raw['logentry']['message'])) {
+            return Str::limit($raw['logentry']['message'], 2000);
+        }
+
+        $exceptions = $raw['exception']['values'] ?? [];
+        $last = end($exceptions);
+        if ($last) {
+            $type = $last['type'] ?? 'Error';
+            $value = $last['value'] ?? '';
+
+            return Str::limit("{$type}: {$value}", 2000);
+        }
+
+        return null;
+    }
+
+    private function normalizeTimestamp(mixed $timestamp): Carbon
+    {
+        if ($timestamp === null) {
+            return Carbon::now();
+        }
+
+        if (is_numeric($timestamp)) {
+            return Carbon::createFromTimestamp((float) $timestamp);
+        }
+
+        return Carbon::parse($timestamp);
+    }
+
+    /**
+     * Tags can arrive as key-value pairs or as an array of {key, value} objects.
+     * Normalize to a plain associative array.
+     */
+    private function normalizeTags(mixed $tags): ?array
+    {
+        if ($tags === null) {
+            return null;
+        }
+
+        if (array_is_list($tags)) {
+            $normalized = [];
+            foreach ($tags as $tag) {
+                if (isset($tag['key'], $tag['value'])) {
+                    $normalized[$tag['key']] = $tag['value'];
+                }
+            }
+
+            return $normalized ?: null;
+        }
+
+        return $tags;
+    }
+}
diff --git a/bootstrap/app.php b/bootstrap/app.php
index c183276..98fe6dc 100644
--- a/bootstrap/app.php
+++ b/bootstrap/app.php
@@ -7,6 +7,8 @@ use Illuminate\Foundation\Configuration\Middleware;
 return Application::configure(basePath: dirname(__DIR__))
     ->withRouting(
         web: __DIR__.'/../routes/web.php',
+        api: __DIR__.'/../routes/api.php',
+        apiPrefix: 'api',
         commands: __DIR__.'/../routes/console.php',
         health: '/up',
     )
diff --git a/routes/api.php b/routes/api.php
new file mode 100644
index 0000000..07bbec2
--- /dev/null
+++ b/routes/api.php
@@ -0,0 +1,9 @@
+<?php
+
+use App\Http\Controllers\Api\EventIngestController;
+use App\Http\Middleware\AuthenticateDsn;
+use Illuminate\Support\Facades\Route;
+
+Route::post('/{project}/store/', [EventIngestController::class, 'store'])
+    ->middleware(AuthenticateDsn::class)
+    ->name('api.events.store');