Create app.py

app.py

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+import gradio as gr
+import os
+from anthropic import Anthropic
+
+client = Anthropic(api_key=os.environ.get("ANTHROPIC_API_KEY", ""))
+
+API_KNOWLEDGE_BASE = """
+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, Stability AI
+COMMUNICATION: Twilio (SMS/Voice), SendGrid (email), Resend, Mailgun, Vonage, WhatsApp Business
+DATA/ENRICHMENT: Clearbit, Apollo.io, Hunter.io, Proxycurl, PeopleDataLabs
+MAPS/LOCATION: Google Maps, Mapbox, HERE, OpenStreetMap/Nominatim
+MEDIA: Cloudinary, Mux (video), Imgix, Transloadit
+FINANCE/MARKET DATA: Alpha Vantage, Polygon.io, CoinGecko, Plaid, Finnhub
+SEARCH: Algolia, Typesense, Elasticsearch, Meilisearch
+AUTH: Auth0, Clerk, Supabase Auth, Firebase Auth
+DATABASE/BACKEND: Supabase, Firebase, PlanetScale, Neon, Upstash
+SCRAPING/CRAWLING: Apify, ScraperAPI, Browserless, Firecrawl
+SOCIAL: Twitter/X API, Reddit API, LinkedIn API, Instagram Graph API
+PRODUCTIVITY: Notion API, Airtable, Google Workspace, Microsoft Graph
+E-COMMERCE: Shopify, WooCommerce, Printful (print-on-demand)
+ANALYTICS: Mixpanel, PostHog, Amplitude, Plausible
+"""
+
+SYSTEM_PROMPT = API_KNOWLEDGE_BASE + """
+
+When a user describes their product idea, you will recommend the perfect API stack.
+
+Your response MUST follow this exact format:
+
+## 🎯 Your Idea in One Line
+(restate the idea clearly and concisely)
+
+## 🔧 Recommended API Stack
+
+For each API (recommend 3-5 total), use this format:
+
+### [API Name] — [Role in the product]
+- **What it does for you:** (one sentence)
+- **Pricing:** (free tier + paid tier, be specific)
+- **Docs:** (exact URL)
+- **Why not alternatives:** (one sentence)
+- **Integration difficulty:** Easy / Medium / Hard
+
+## 💰 Total Monthly API Cost Estimate
+(breakdown for 100 users / 1000 users / 10,000 users)
+
+## ⚡ Build Order
+(which API to integrate first, second, third — and why)
+
+## 🚨 One Thing to Watch Out For
+(the most common mistake with this stack)
+
+Be specific, honest about pricing, and always mention free tiers.
+"""
+
+def get_stack_recommendation(idea, budget, technical_level, target_market):
+    if not idea.strip():
+        return "Please describe your product idea first."
+
+    if not client.api_key:
+        return "⚠️ ANTHROPIC_API_KEY is not set. Add it in Space Settings → Secrets."
+
+    user_message = f"""
+My product idea: {idea}
+
+My monthly API budget: {budget}
+My technical level: {technical_level}
+Target market: {target_market}
+
+Please recommend the best API stack for this.
+"""
+
+    try:
+        response = client.messages.create(
+            model="claude-sonnet-4-6",
+            max_tokens=1500,
+            system=SYSTEM_PROMPT,
+            messages=[{"role": "user", "content": user_message}]
+        )
+        return response.content[0].text
+    except Exception as e:
+        return f"❌ Error: {str(e)}"
+
+def ask_followup(question, previous_recommendation):
+    if not question.strip():
+        return ""
+    if not previous_recommendation or previous_recommendation.startswith("Please") or previous_recommendation.startswith("⚠️"):
+        return "Please generate a stack recommendation first."
+
+    try:
+        response = client.messages.create(
+            model="claude-sonnet-4-6",
+            max_tokens=800,
+            system=SYSTEM_PROMPT,
+            messages=[
+                {
+                    "role": "user",
+                    "content": f"I got this API stack recommendation:\n\n{previous_recommendation}\n\nMy follow-up question: {question}"
+                }
+            ]
+        )
+        return response.content[0].text
+    except Exception as e:
+        return f"❌ Error: {str(e)}"
+
+EXAMPLES = [
+    ["A Notion-like note taking app with AI summarization", "$50/month", "Intermediate", "Students and researchers"],
+    ["An SMS marketing platform for small restaurants", "$30/month", "Beginner", "Local restaurant owners"],
+    ["A job board that auto-matches candidates with AI", "$100/month", "Advanced", "Tech recruiters"],
+    ["A podcast transcription and highlight tool", "$20/month", "Beginner", "Podcasters"],
+    ["A crypto portfolio tracker with price alerts", "$0 (free only)", "Intermediate", "Retail crypto 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 breakdown, and build order**
+
+Powered by Claude (Anthropic) — No more guessing which APIs to use.
+""")
+
+    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 their services and get paid instantly via Stripe...",
+                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="Your technical level"
+            )
+            market_input = gr.Textbox(
+                label="Target market",
+                placeholder="e.g. Small business owners in Europe",
+                value="General consumers"
+            )
+
+    gr.Markdown("**Try an example:**")
+    with gr.Row():
+        for ex in EXAMPLES:
+            gr.Button(ex[0][:35] + "...", 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")
+
+    recommendation_output = gr.Markdown(
+        value="*Your API stack recommendation will appear here...*",
+        label="Recommended Stack"
+    )
+
+    gr.Markdown("---")
+    gr.Markdown("### 💬 Ask a follow-up question")
+    with gr.Row():
+        followup_input = gr.Textbox(
+            label="Follow-up",
+            placeholder="e.g. Is there a cheaper alternative to Twilio? / How do I handle auth without Auth0?",
+            scale=4
+        )
+        followup_btn = gr.Button("Ask", scale=1, variant="secondary")
+
+    followup_output = gr.Markdown()
+
+    submit_btn.click(
+        get_stack_recommendation,
+        inputs=[idea_input, budget_input, level_input, market_input],
+        outputs=recommendation_output
+    )
+
+    followup_btn.click(
+        ask_followup,
+        inputs=[followup_input, recommendation_output],
+        outputs=followup_output
+    )
+
+    gr.Markdown("""
+---
+Built with [Gradio](https://gradio.app) + [Claude](https://anthropic.com) · 
+[View on HuggingFace](https://huggingface.co/spaces/Alireza1913/Monetizable_API_Finder)
+""")
+
+if __name__ == "__main__":
+    demo.launch()