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How to Build an AI SaaS in 2026: The Complete Technical Guide (From Zero to Revenue)

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SaaSCity Team
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How to Build an AI SaaS in 2026: The Complete Technical Guide (From Zero to Revenue)

You want to build an AI SaaS. Maybe an image generator using Fal.ai or Replicate, a copywriting tool powered by GPT-5, or an AI video platform built on Kling or WaveSpeed. You've seen the tutorials. They all show you the same thing: call an API, display the result, done.

That's about 2% of the actual work.

The remaining 98% is the stuff nobody talks about: credit systems that don't let users drain your API budget, Stripe webhooks that actually reconcile payments, rate limiting that prevents abuse, content moderation that keeps you from getting banned by your AI provider, and an admin dashboard so you can see what's happening without running SQL queries at 2 AM.

This guide walks through all of it. Every painful step. Every edge case that will bite you at 3 AM when a user figures out how to get free generations.

The Stack You Need (and Why)

Before writing a single line of code, you need to pick a stack that won't fall apart at scale. Here's what works in 2026:

Frontend: Next.js 16 with App Router and Turbopack. React Server Components reduce client bundle size, Server Actions simplify mutations, and the Edge Runtime gives you sub-100ms responses for AI streaming. Turbopack is now stable and the default bundler—expect 70x faster dev builds compared to the old Webpack setup.

Database: Supabase (PostgreSQL). You get auth, real-time subscriptions, and Row Level Security out of the box. More importantly, Supabase supports pgvector—so your embeddings live right next to your user data. No need for a separate Pinecone or Weaviate instance.

Payments: Stripe. Accept credit cards, handle subscriptions, manage refunds. The webhook system is battle-tested.

AI Providers: You don't call models directly anymore—you use inference platforms like Fal.ai, Replicate, WaveSpeed, and Kie.ai that give you access to hundreds of models through a single API. More on this below.

Hosting: Vercel for the frontend, Supabase handles the backend. Total monthly cost for a starter app: roughly $0–$25 until you hit serious traffic.

This stack is not theoretical. It powers thousands of production AI apps right now. If you want to skip the weeks of configuration and get this stack pre-wired, the SaaSCity AI Boilerplate ships with all of this out of the box.

The AI Model Landscape in February 2026

This is where things have changed the most. Forget what you knew about AI models from even a year ago—the landscape in 2026 is completely different. GPT-4o is retired. DALL-E feels ancient. Here's what you're actually working with.

Text Generation Models

ModelProviderInput Cost (per 1M tokens)Output Cost (per 1M tokens)Best For
GPT-5 nanoOpenAI$0.05$0.40Simple tasks, classification, cheap routing
GPT-5 miniOpenAI$0.25$2.00Balanced quality/cost for most SaaS features
GPT-5OpenAI$1.25$10.00Complex coding, agents
GPT-5.2OpenAI$1.75$14.00Heaviest reasoning, research
GPT-5.3-Codex-SparkOpenAIResearch previewResearch previewUltra-fast coding (1,000+ tokens/sec on Cerebras)
Claude Opus 4.6Anthropic~$15.00~$75.001M token context, document processing, code review
o3OpenAIVariesVariesDeep reasoning, math, science
o4-miniOpenAIVariesVariesLighter reasoning tasks

Pro tip: Route cheap tasks (summaries, classification) to GPT-5 nano and heavy tasks (long-form content, code generation) to GPT-5 or Claude Opus 4.6. This alone can cut your API costs by 80%.

Image Generation Models

The image generation space has exploded. Here are the models worth integrating:

ModelWhat It's Best AtAvailable OnApprox. Cost
FLUX 2 Pro (Black Forest Labs)Photorealism, physical accuracy, multi-reference consistencyFal.ai, Replicate, WaveSpeed~$0.01–0.04/image
FLUX 2 MaxArtistic styles, open-source flexibility, anime to photorealismFal.ai, Replicate, self-hosted~$0.008–0.012/megapixel
FLUX Kontext ProImage editing, style transfer, context-aware generationFal.ai~$0.04/image
GPT Image 1.5 (OpenAI)Best text rendering in images, exceptional prompt adherenceOpenAI API~$0.02–0.08/image
Recraft V3Logos, vector art, SVG export, brand-consistent graphicsFal.ai, direct API~$0.03–0.05/image
Ideogram 3.0Accurate typography (~90% text accuracy), marketing materialsDirect API~$0.03/image
Gemini 3 Pro Image (Google)Fast generation (3–5 sec), realism, multi-turn editingGoogle API, Fal.ai~$0.04/image
MidjourneyArtistic, cinematic, concept art, imaginative visualsMidjourney APISubscription-based
Stable Diffusion 3.5Open-source, self-hostable, full control, LoRA fine-tuningReplicate, self-hostedFree (self-host) or ~$0.01/image
ImagineArt 1.5High-fidelity professional visuals, product photographyFal.ai~$0.03/image

Where to access them:

  • Fal.ai — 600+ models, up to 4x faster inference with their proprietary engine. Best for speed. Processes 50M+ images daily.
  • Replicate — Broadest model library, thousands of community models, easy fine-tuning. Best for variety.
  • WaveSpeed — Competitive pricing on FLUX models, optimized for speed.

Video Generation Models

Video generation is the hottest (and most expensive) category right now. These are the models that matter:

ModelMax DurationResolutionNative AudioApprox. CostAvailable On
Kling 3.0 (Kuaishou)3–15 sec720p / 1080pYes (voice control, sound design)$0.168–0.392/secFal.ai, Kie.ai
Kling 2.6Up to 2 min1080pYes (dialogue, SFX, ambient)~$0.07–0.14/secFal.ai, Replicate
Google Veo 3.15–10 sec1080p (4K upscale)Yes (lip sync, natural sound)$0.25–0.75/secFal.ai
OpenAI Sora 215–25 sec1080pYes (dialogue, SFX)~$0.20–0.50/secReplicate, ChatGPT Pro
Hailuo 02 (MiniMax)Up to 10 sec1080pNo~$0.05–0.15/secFal.ai, Replicate
Wan 2.6 (Alibaba)Up to 15 sec1080pYes (audio-visual sync)~$0.05/secFal.ai, Replicate
Runway Gen-4.55–15 sec1080pNo~$0.10–0.25/secRunway API
Seedance 2.0 (ByteDance)5–10 sec1080pMultimodal input~$0.10–0.20/secFal.ai
Luma Ray35–10 sec4K HDRNo~$0.15–0.30/secLuma API
PixVerse v45–10 sec1080pNoCredit-basedReplicate

Key takeaways for building a video SaaS:

  • Cheapest option: Wan 2.6 at ~$0.05/sec—great for high-volume use cases
  • Best quality: Veo 3.1 or Sora 2 for cinematic results, but they cost 5–10x more
  • Best for realistic humans: Kling 3.0 with face/lip-sync capabilities
  • Audio is expensive: Native audio typically doubles the per-second cost
  • A 5-second video costs $0.25–$3.75 depending on model and settings—make sure your credit system accounts for this

Inference Platforms: Where You Actually Call These Models

Don't integrate each model's API separately. Use an inference platform:

PlatformStrengthsModelsPricing Model
Fal.aiFastest inference (4x faster), 600+ models, serverlessFLUX 2, Kling 3.0, Veo 3.1, Sora 2, Recraft, Seedance 2.0Pay-per-output (per image, per second of video)
ReplicateLargest model library, community models, easy fine-tuningPixVerse, Wan, Kling, Sora 2, Stable Diffusion, thousands morePay-per-second of compute
WaveSpeedSpeed-optimized FLUX, competitive pricingFLUX variants, select video modelsPay-per-output
Kie.aiKling-focused, credit-based, simple APIKling 3.0, Kling 2.6Credit-based

Most production AI SaaS apps use 2–3 of these platforms simultaneously, routing to the cheapest or fastest provider for each specific model.

Step 1: Authentication (The "Easy" Part That Isn't)

Every tutorial starts with auth because it feels productive. "Look, users can sign in!" But the devil is in the details.

You need:

  • Email/password signup with email verification
  • OAuth providers (Google, GitHub at minimum)
  • Session management that works with React Server Components
  • Protected API routes that verify tokens on every request
  • A users table that links auth IDs to your application data

Here's the Supabase setup:

-- Users table linked to Supabase Auth
CREATE TABLE public.users (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  auth_id UUID REFERENCES auth.users(id) ON DELETE CASCADE,
  email TEXT NOT NULL,
  display_name TEXT,
  avatar_url TEXT,
  credits INTEGER DEFAULT 0,
  plan TEXT DEFAULT 'free',
  created_at TIMESTAMPTZ DEFAULT now()
);

-- Row Level Security: users can only read their own data
ALTER TABLE public.users ENABLE ROW LEVEL SECURITY;

CREATE POLICY "Users can read own data"
  ON public.users FOR SELECT
  USING (auth_id = auth.uid());

CREATE POLICY "Users can update own data"
  ON public.users FOR UPDATE
  USING (auth_id = auth.uid());

Notice the credits column. That's your monetization engine. We'll get to that.

The auth trigger that creates a user profile on signup:

CREATE OR REPLACE FUNCTION public.handle_new_user()
RETURNS TRIGGER AS $$
BEGIN
  INSERT INTO public.users (auth_id, email, display_name)
  VALUES (
    NEW.id,
    NEW.email,
    COALESCE(NEW.raw_user_meta_data->>'full_name', split_part(NEW.email, '@', 1))
  );
  RETURN NEW;
END;
$$ LANGUAGE plpgsql SECURITY DEFINER;

CREATE TRIGGER on_auth_user_created
  AFTER INSERT ON auth.users
  FOR EACH ROW EXECUTE FUNCTION public.handle_new_user();

Time estimate: 4–8 hours if you've done this before. 2–3 days if you haven't. And that's before you handle edge cases like users signing in with Google after already creating an account with email.

Shortcut: The SaaSCity AI Boilerplate ships with all of this pre-configured, including the RLS policies, auth triggers, and OAuth setup. You skip straight to building your AI features.

Step 2: The Credit System (Where Most Projects Stall)

This is the part that separates toy projects from real businesses. Your users need to pay per generation, not per month (or at least have the option). Flat subscriptions don't work well for AI because your costs scale with usage—especially when one GPT-5.2 call costs 7x more than a GPT-5 nano call.

The credit system needs to handle:

  • Buying credits via Stripe
  • Deducting credits per generation (different costs for different models and providers)
  • Preventing negative balances (race conditions are real)
  • Showing usage history
  • Admin visibility into credit flow

Here's the schema:

CREATE TABLE public.credit_transactions (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID REFERENCES public.users(id),
  amount INTEGER NOT NULL, -- positive = purchase, negative = usage
  balance_after INTEGER NOT NULL,
  type TEXT NOT NULL, -- 'purchase', 'generation', 'refund', 'bonus'
  description TEXT,
  metadata JSONB DEFAULT '{}',
  created_at TIMESTAMPTZ DEFAULT now()
);

CREATE INDEX idx_credit_transactions_user
  ON public.credit_transactions(user_id, created_at DESC);

And the critical function that deducts credits atomically:

CREATE OR REPLACE FUNCTION public.deduct_credits(
  p_user_id UUID,
  p_amount INTEGER,
  p_description TEXT DEFAULT 'AI generation'
)
RETURNS BOOLEAN AS $$
DECLARE
  v_current_balance INTEGER;
BEGIN
  -- Lock the user row to prevent race conditions
  SELECT credits INTO v_current_balance
  FROM public.users
  WHERE id = p_user_id
  FOR UPDATE;

  IF v_current_balance < p_amount THEN
    RETURN FALSE; -- Insufficient credits
  END IF;

  -- Deduct credits
  UPDATE public.users
  SET credits = credits - p_amount
  WHERE id = p_user_id;

  -- Log the transaction
  INSERT INTO public.credit_transactions
    (user_id, amount, balance_after, type, description)
  VALUES
    (p_user_id, -p_amount, v_current_balance - p_amount, 'generation', p_description);

  RETURN TRUE;
END;
$$ LANGUAGE plpgsql;

The FOR UPDATE lock is crucial. Without it, two simultaneous requests can both read the same balance, both pass the check, and both deduct—leaving the user with a negative balance and you paying for generations out of pocket.

Time estimate: 1–2 weeks to build, test, and handle all edge cases (failed generations that should refund credits, webhook retries that double-charge, etc.)

Shortcut: This entire credit system—the schema, the atomic deduction function, the Stripe webhook handler, the usage dashboard—is pre-built in the SaaSCity AI Boilerplate. It took us three iterations to get right.

Step 3: Stripe Integration (The Webhook Nightmare)

Accepting payments is easy. Handling webhooks correctly is not.

The basic flow:

  1. User clicks "Buy 100 Credits" → Stripe Checkout session
  2. User pays → Stripe fires checkout.session.completed webhook
  3. Your server receives the webhook → credits added to user account
  4. User sees updated balance

Sounds simple. Here's what goes wrong:

Webhook retries: Stripe retries failed webhooks up to 3 times. If your handler isn't idempotent, users get triple credits.

Signature verification: Every webhook must be verified with your Stripe webhook secret. Skip this and anyone can POST fake events to your endpoint.

Async timing: The webhook sometimes arrives before the user is redirected back to your app. The user sees their old balance, panics, and buys again.

Here's a simplified webhook handler using Next.js 16 Server Actions:

// app/api/webhooks/stripe/route.ts
import Stripe from 'stripe';

const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!);

export async function POST(req: Request) {
  const body = await req.text();
  const sig = req.headers.get('stripe-signature')!;

  let event: Stripe.Event;
  try {
    event = stripe.webhooks.constructEvent(
      body,
      sig,
      process.env.STRIPE_WEBHOOK_SECRET!
    );
  } catch {
    return new Response('Invalid signature', { status: 400 });
  }

  if (event.type === 'checkout.session.completed') {
    const session = event.data.object as Stripe.Checkout.Session;
    
    // IDEMPOTENCY: Check if we already processed this session
    const { data: existing } = await supabase
      .from('credit_transactions')
      .select('id')
      .eq('metadata->>stripe_session_id', session.id)
      .single();

    if (existing) {
      return new Response('Already processed', { status: 200 });
    }

    // Add credits to user
    const credits = Number(session.metadata?.credits || 0);
    const userId = session.metadata?.user_id;

    await supabase.rpc('add_credits', {
      p_user_id: userId,
      p_amount: credits,
      p_stripe_session_id: session.id,
    });
  }

  return new Response('OK', { status: 200 });
}

Time estimate: 1–2 weeks for the full payment flow, including checkout pages, webhook handling, receipt emails, refund logic, and subscription management.

Step 4: AI Model Integration (The Fun Part, Finally)

Now you actually call the AI. But even this has hidden complexity.

You need:

  • A unified interface that works with multiple providers (OpenAI, Anthropic, Fal.ai, Replicate)
  • Streaming responses for text models (users hate waiting for a full response)
  • Async polling for image/video models (Fal.ai and Replicate return results asynchronously)
  • Error handling for rate limits, timeouts, and content policy violations
  • Token counting to calculate credit costs accurately

Here's a streaming text generation route using GPT-5 mini:

// app/api/generate/route.ts
import { OpenAI } from 'openai';

const openai = new OpenAI();

export async function POST(req: Request) {
  const { prompt, model, userId } = await req.json();

  // 1. Check credits (GPT-5 nano = 1 credit, GPT-5.2 = 10 credits)
  const hasCredits = await supabase.rpc('deduct_credits', {
    p_user_id: userId,
    p_amount: getModelCost(model),
    p_description: `${model} generation`,
  });

  if (!hasCredits) {
    return new Response('Insufficient credits', { status: 402 });
  }

  // 2. Call the AI
  const stream = await openai.chat.completions.create({
    model, // 'gpt-5-mini', 'gpt-5', 'gpt-5.2', etc.
    messages: [{ role: 'user', content: prompt }],
    stream: true,
  });

  // 3. Stream the response
  const encoder = new TextEncoder();
  const readable = new ReadableStream({
    async start(controller) {
      for await (const chunk of stream) {
        const text = chunk.choices[0]?.delta?.content || '';
        controller.enqueue(encoder.encode(text));
      }
      controller.close();
    },
  });

  return new Response(readable, {
    headers: { 'Content-Type': 'text/event-stream' },
  });
}

And here's how you call Fal.ai for image generation:

// app/api/generate-image/route.ts
import * as fal from '@fal-ai/serverless-client';

fal.config({ credentials: process.env.FAL_KEY });

export async function POST(req: Request) {
  const { prompt, userId } = await req.json();

  // Deduct credits first
  const hasCredits = await supabase.rpc('deduct_credits', {
    p_user_id: userId,
    p_amount: 5, // Image generation costs more credits
    p_description: 'FLUX image generation via Fal.ai',
  });

  if (!hasCredits) {
    return new Response('Insufficient credits', { status: 402 });
  }

  // Call Fal.ai (async - returns result directly)
  const result = await fal.subscribe('fal-ai/flux/dev', {
    input: { prompt, image_size: 'landscape_16_9' },
  });

  return Response.json({ 
    imageUrl: result.images[0].url 
  });
}

For video generation with Replicate:

// app/api/generate-video/route.ts
import Replicate from 'replicate';

const replicate = new Replicate();

export async function POST(req: Request) {
  const { prompt, userId } = await req.json();

  // Video costs significantly more
  const hasCredits = await supabase.rpc('deduct_credits', {
    p_user_id: userId,
    p_amount: 25,
    p_description: 'Video generation via Replicate',
  });

  if (!hasCredits) {
    return new Response('Insufficient credits', { status: 402 });
  }

  const output = await replicate.run(
    'kling-ai/kling-v2-master',
    { input: { prompt, duration: 5 } }
  );

  return Response.json({ videoUrl: output });
}

The production version needs to handle:

  • What happens if the generation fails mid-stream? Do you refund credits?
  • What if the user's prompt violates the provider's content policy?
  • How do you calculate actual token cost after streaming (not before)?
  • Fal.ai and Replicate can take 30–120 seconds for video—how do you handle timeouts?

Time estimate: 3–5 days for a single provider. 2–3 weeks if you want to support multiple providers (text + image + video) with a unified interface.

Step 5: AI Content Moderation (The Part Everyone Skips)

Skip this and you'll learn why it matters the hard way—when OpenAI suspends your API key because a user generated something that violates their usage policy. Or worse, when Fal.ai flags your account for generating prohibited content.

Content moderation needs to:

  • Screen user inputs before they reach the AI
  • Filter AI outputs before they reach the user
  • Log flagged content for admin review
  • Automatically block repeat offenders
// lib/moderation.ts
import { OpenAI } from 'openai';

const openai = new OpenAI();

export async function moderateInput(text: string): Promise<{
  safe: boolean;
  categories: string[];
}> {
  const response = await openai.moderations.create({ input: text });
  const result = response.results[0];

  return {
    safe: !result.flagged,
    categories: Object.entries(result.categories)
      .filter(([, flagged]) => flagged)
      .map(([category]) => category),
  };
}

You also need rate limiting per user:

// Simple in-memory rate limiter (use Redis or Upstash in production)
const rateLimits = new Map<string, number[]>();

export function checkRateLimit(userId: string, maxPerMinute = 10): boolean {
  const now = Date.now();
  const timestamps = rateLimits.get(userId) || [];
  const recent = timestamps.filter(t => now - t < 60_000);

  if (recent.length >= maxPerMinute) return false;

  recent.push(now);
  rateLimits.set(userId, recent);
  return true;
}

Time estimate: 2–3 days for basic moderation. 1–2 weeks for a robust system with admin review queues and automatic banning.

Shortcut: The SaaSCity AI Boilerplate includes a full moderation pipeline with input screening, output filtering, admin review dashboard, and automatic rate limiting. It's the feature that keeps your API keys safe while you sleep.

Step 6: Admin Dashboard (You Need Eyes on Everything)

You need to see:

  • Total revenue and credit purchases
  • Active users and generation counts
  • Flagged content awaiting review
  • API costs vs revenue (are you profitable?)
  • Individual user activity (for support requests)
  • Provider-level analytics (which AI providers are costing you the most?)

Building a proper admin panel takes 2–4 weeks. It's not glamorous work, but without it you're flying blind.

The Total Time Investment

Let's add it up:

ComponentTime (Experienced Dev)Time (First Timer)
Auth + User System4–8 hours2–3 days
Credit System1–2 weeks3–4 weeks
Stripe Integration1–2 weeks2–3 weeks
AI Model Integration3–5 days2–3 weeks
Content Moderation2–3 days1–2 weeks
Admin Dashboard2–4 weeks4–6 weeks
UI/UX Polish1–2 weeks2–4 weeks
Bug Fixes & Edge Cases1–2 weeks2–4 weeks
Total2–3 months4–6 months

And that's before you build your actual AI feature—the thing that makes your product unique.

The Build vs Buy Decision

Here's the honest truth: the components listed above are infrastructure. They're necessary, but they're not your competitive advantage. Your competitive advantage is the specific AI workflow you're building on top of this infrastructure.

Every week you spend building auth, payments, and credit systems is a week you're not building the thing that makes users choose you over competitors.

There are three paths:

Path 1: Build Everything From Scratch. Full control. Full pain. 4–6 months before your first user sees anything. Best for teams with deep engineering talent and runway to burn.

Path 2: Piece Together Open Source. Use Create T3 App for the base, add Stripe manually, bolt on Fal.ai or Replicate. You'll save some time but still spend weeks on integration and edge cases.

Path 3: Use a Specialized AI Boilerplate. Start with a production-ready codebase that has auth, payments, credits, moderation, and multi-provider AI integration pre-built. Ship your unique features in days, not months.

If you're an indie hacker or a small team that needs revenue fast, Path 3 is the rational choice. The SaaSCity AI Boilerplate was built specifically for this use case—it gives you the entire infrastructure layer so you can focus on what makes your product unique.

What to Build First

Regardless of which path you choose, here's the order that works:

  1. Auth + basic UI (users need to log in)
  2. One AI feature (the core value prop—pick one provider and one model)
  3. Credits + Stripe (start charging immediately)
  4. Moderation (protect your API keys)
  5. Admin dashboard (visibility into what's happening)
  6. Multi-provider support (add Fal.ai, Replicate, Claude alongside GPT-5)
  7. Polish (onboarding, emails, landing page)

Do not build a perfect landing page before you have a working product. Do not add 5 AI models before the first one works. Do not optimize your pricing page before anyone has paid you.

Ship the minimum. Charge for it. Iterate based on what paying users tell you.


FAQ

How much does it cost to run an AI SaaS in 2026?

Your main costs are AI API calls and hosting. See the model pricing tables above for exact numbers, but as a rule of thumb: text generation ranges from $0.05/1M tokens (GPT-5 nano) to $15/1M tokens (Claude Opus 4.6). Image generation costs $0.01–$0.08 per image depending on the model. Video generation is the most expensive—$0.05/sec (Wan 2.6) to $0.75/sec (Veo 3.1 with audio). A single 5-second video clip can cost anywhere from $0.25 to $3.75. Charge your users 5–10x your cost and you're profitable from day one. Hosting on Vercel + Supabase starts free and scales to ~$25/month for moderate traffic.

Do I need a vector database?

Only if you're building RAG (Retrieval Augmented Generation)—like a chatbot that answers questions about uploaded documents. If you're wrapping an API for image/video generation or text rewriting, you don't need vectors. If you do, Supabase's pgvector extension means you don't need a separate service like Pinecone.

Can I use Claude instead of GPT-5?

Yes. Claude Opus 4.6 from Anthropic offers a massive 1M token context window, which is insane for document processing. The API patterns are nearly identical to OpenAI. Most production AI SaaS apps support both so users can choose. The credit system should charge different amounts per model since costs vary significantly.

Which image/video generation provider should I pick?

For speed, go with Fal.ai—their inference engine runs diffusion models up to 4x faster. For model variety, go with Replicate—they host thousands of community models. For video specifically, also consider Kling AI and WaveSpeed. Many production apps use multiple providers and let users choose.

What about fine-tuning?

Start with base models and prompt engineering. OpenAI fine-tuning for GPT-4.1 costs $25/1M training tokens, and the quality difference is often marginal for most use cases. Only fine-tune when you have clear data showing the base model isn't good enough for your specific domain.

Should I build a Chrome extension or a web app?

Start with a web app. It's faster to build, easier to monetize, and simpler to maintain. Chrome extensions add a distribution channel, but they come with their own packaging, review, and update headaches. Add one later when you have traction.


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