Create app.py

app.py

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+import gradio as gr
+import os
+from huggingface_hub import InferenceClient
+
+HF_TOKEN = os.environ.get("HF_TOKEN", "")
+MODEL = "mistralai/Mistral-7B-Instruct-v0.3"
+
+SYSTEM_PROMPT = """You are an expert API architect and indie hacker advisor.
+
+You know every major API deeply:
+
+PAYMENT: Stripe, Paddle, LemonSqueezy, PayPal, Razorpay
+AI/ML: OpenAI, Anthropic Claude, Replicate, HuggingFace Inference, AssemblyAI, ElevenLabs
+COMMUNICATION: Twilio (SMS/Voice), SendGrid (email), Resend, Mailgun, WhatsApp Business
+DATA/ENRICHMENT: Clearbit, Apollo.io, Hunter.io, Proxycurl
+MAPS/LOCATION: Google Maps, Mapbox, HERE, OpenStreetMap
+MEDIA: Cloudinary, Mux (video), Imgix, Transloadit
+FINANCE: Alpha Vantage, Polygon.io, CoinGecko, Plaid, Finnhub
+SEARCH: Algolia, Typesense, Meilisearch
+AUTH: Auth0, Clerk, Supabase Auth, Firebase Auth
+DATABASE: Supabase, Firebase, PlanetScale, Neon, Upstash
+SCRAPING: Apify, ScraperAPI, Browserless, Firecrawl
+ANALYTICS: Mixpanel, PostHog, Amplitude, Plausible
+
+When a user describes their product idea, recommend the perfect API stack.
+
+Your response MUST follow this exact format:
+
+## 🎯 Your Idea in One Line
+(restate the idea clearly)
+
+## 🔧 Recommended API Stack
+
+For each API (recommend 3-5 total):
+
+### [API Name] — [Role in the product]
+- **What it does for you:** (one sentence)
+- **Pricing:** (free tier + paid, be specific with numbers)
+- **Docs:** (exact URL)
+- **Why not alternatives:** (one sentence)
+- **Integration difficulty:** Easy / Medium / Hard
+
+## 💰 Monthly Cost Estimate
+| Users | Est. Cost |
+|-------|-----------|
+| 100   | $X/month  |
+| 1,000 | $X/month  |
+| 10,000| $X/month  |
+
+## ⚡ Build Order
+1. First: [API] — because...
+2. Second: [API] — because...
+3. Third: [API] — because...
+
+## 🚨 Top Mistake to Avoid
+(the most common mistake with this stack)
+
+Be specific, honest about pricing, always mention free tiers."""
+
+
+def get_stack(idea, budget, level, market):
+    if not idea.strip():
+        return "⚠️ Please describe your product idea."
+
+    if not HF_TOKEN:
+        return (
+            "⚠️ **HF_TOKEN is not set.**\n\n"
+            "Go to: **Space Settings → Secrets → New secret**\n"
+            "- Name: `HF_TOKEN`\n"
+            "- Value: your token from [huggingface.co/settings/tokens](https://huggingface.co/settings/tokens)\n\n"
+            "Free token — no credit card needed!"
+        )
+
+    try:
+        client = InferenceClient(token=HF_TOKEN)
+
+        prompt = f"""Product idea: {idea}
+
+Monthly API budget: {budget}
+Technical level: {level}
+Target market: {market}
+
+Recommend the best API stack for this product."""
+
+        messages = [
+            {"role": "system", "content": SYSTEM_PROMPT},
+            {"role": "user", "content": prompt}
+        ]
+
+        response = client.chat.completions.create(
+            model=MODEL,
+            messages=messages,
+            max_tokens=1500,
+            temperature=0.7
+        )
+        return response.choices[0].message.content
+
+    except Exception as e:
+        err = str(e)
+        if "401" in err or "auth" in err.lower():
+            return "❌ Invalid token. Check your HF_TOKEN in Space Settings."
+        if "429" in err or "rate" in err.lower():
+            return "❌ Rate limit hit. Wait 30 seconds and try again."
+        if "loading" in err.lower():
+            return "⏳ Model is loading (cold start). Wait 20 seconds and try again."
+        return f"❌ Error: {err}"
+
+
+def ask_followup(question, prev):
+    if not question.strip():
+        return ""
+    if not prev or prev.startswith("⚠️") or prev.startswith("❌"):
+        return "⚠️ Please generate a stack recommendation first."
+
+    try:
+        client = InferenceClient(token=HF_TOKEN)
+        messages = [
+            {"role": "system", "content": SYSTEM_PROMPT},
+            {
+                "role": "user",
+                "content": (
+                    f"Previous recommendation:\n{prev}\n\n"
+                    f"Follow-up question: {question}\n\n"
+                    f"Answer concisely and helpfully."
+                )
+            }
+        ]
+        response = client.chat.completions.create(
+            model=MODEL,
+            messages=messages,
+            max_tokens=800,
+            temperature=0.7
+        )
+        return response.choices[0].message.content
+
+    except Exception as e:
+        return f"❌ Error: {str(e)}"
+
+
+EXAMPLES = [
+    ["A Notion-like notes app with AI summarization", "$50/month", "Intermediate", "Students"],
+    ["SMS marketing platform for small restaurants", "$30/month", "Beginner", "Restaurant owners"],
+    ["Job board that auto-matches candidates with AI", "$100/month", "Advanced", "Tech recruiters"],
+    ["Podcast transcription and highlight tool", "$20/month", "Beginner", "Podcasters"],
+    ["Crypto portfolio tracker with price alerts", "$0 (free only)", "Intermediate", "Retail investors"],
+]
+
+css = """
+.gradio-container { max-width: 900px !important; margin: auto; }
+footer { display: none !important; }
+"""
+
+with gr.Blocks(css=css, title="API Stack Finder") as demo:
+    gr.Markdown("""
+# 🔧 API Stack Finder
+**Describe your product idea → Get the perfect API stack, pricing, and build order**
+
+Powered by **Mistral-7B-Instruct** via HuggingFace Inference API — 100% Free.
+""")
+
+    with gr.Row():
+        with gr.Column(scale=3):
+            idea_input = gr.Textbox(
+                label="Describe your product idea",
+                placeholder="e.g. A platform where freelancers can sell services and get paid instantly...",
+                lines=4
+            )
+        with gr.Column(scale=1):
+            budget_input = gr.Dropdown(
+                choices=[
+                    "$0 (free only)",
+                    "$10/month",
+                    "$30/month",
+                    "$50/month",
+                    "$100/month",
+                    "$500/month",
+                    "Unlimited"
+                ],
+                value="$30/month",
+                label="Monthly API budget"
+            )
+            level_input = gr.Dropdown(
+                choices=["Beginner", "Intermediate", "Advanced"],
+                value="Intermediate",
+                label="Technical level"
+            )
+            market_input = gr.Textbox(
+                label="Target market",
+                placeholder="e.g. Small business owners",
+                value="General consumers"
+            )
+
+    gr.Markdown("**Try an example:**")
+    with gr.Row():
+        for ex in EXAMPLES:
+            gr.Button(ex[0][:32] + "...", size="sm").click(
+                lambda e=ex: (e[0], e[1], e[2], e[3]),
+                outputs=[idea_input, budget_input, level_input, market_input]
+            )
+
+    submit_btn = gr.Button("🔍 Find My API Stack", variant="primary", size="lg")
+    output = gr.Markdown("*Your API stack will appear here...*")
+
+    gr.Markdown("---")
+    gr.Markdown("### 💬 Ask a follow-up")
+
+    with gr.Row():
+        followup_input = gr.Textbox(
+            label="Follow-up question",
+            placeholder="e.g. Is there a free alternative to Stripe? / How do I add auth cheaply?",
+            scale=4
+        )
+        followup_btn = gr.Button("Ask", scale=1, variant="secondary")
+
+    followup_output = gr.Markdown()
+
+    submit_btn.click(
+        get_stack,
+        inputs=[idea_input, budget_input, level_input, market_input],
+        outputs=output
+    )
+    followup_btn.click(
+        ask_followup,
+        inputs=[followup_input, output],
+        outputs=followup_output
+    )
+
+    gr.Markdown("""
+---
+🤖 Model: `Mistral-7B-Instruct-v0.3` · 🆓 Free via HuggingFace Inference API  
+🔑 Get your free token: [huggingface.co/settings/tokens](https://huggingface.co/settings/tokens)
+""")
+
+if __name__ == "__main__":
+    demo.launch()