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app.py

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+"""
+NexaAPI Tutorial 2026 — Cheapest AI API Demo
+Generate AI images with Flux, SDXL, and more for $0.003/image
+
+Get your API key: https://rapidapi.com/user/nexaquency
+Docs: https://nexa-api.com
+"""
+
+import gradio as gr
+import os
+import requests
+
+# NexaAPI configuration
+NEXAAPI_BASE_URL = "https://api.nexa-api.com/v1"
+
+MODELS = {
+    "Flux Schnell ($0.003/image) — Fastest": "flux-schnell",
+    "Flux Pro 1.1 ($0.02/image) — Best Quality": "flux-pro-1.1",
+    "Flux Dev ($0.01/image) — Balanced": "flux-dev",
+    "Stable Diffusion 3.5 ($0.005/image)": "stable-diffusion-3.5",
+    "Stable Diffusion XL ($0.003/image)": "stable-diffusion-xl",
+}
+
+PRICES = {
+    "flux-schnell": 0.003,
+    "flux-pro-1.1": 0.020,
+    "flux-dev": 0.010,
+    "stable-diffusion-3.5": 0.005,
+    "stable-diffusion-xl": 0.003,
+}
+
+
+def generate_image(api_key: str, prompt: str, model_display: str, width: int, height: int):
+    """Generate an image using NexaAPI."""
+    if not api_key:
+        return None, "❌ Please enter your NexaAPI key. Get one free at https://rapidapi.com/user/nexaquency"
+
+    if not prompt:
+        return None, "❌ Please enter a prompt"
+
+    model = MODELS.get(model_display, "flux-schnell")
+    price = PRICES.get(model, 0.003)
+
+    try:
+        # Use OpenAI-compatible endpoint
+        from openai import OpenAI
+        client = OpenAI(api_key=api_key, base_url=NEXAAPI_BASE_URL)
+
+        response = client.images.generate(
+            model=model,
+            prompt=prompt,
+            size=f"{width}x{height}",
+            n=1
+        )
+
+        image_url = response.data[0].url
+        cost_info = f"✅ Generated! Cost: ${price:.3f} | Model: {model} | URL: {image_url}"
+        return image_url, cost_info
+
+    except Exception as e:
+        error_msg = str(e)
+        if "401" in error_msg or "unauthorized" in error_msg.lower():
+            return None, "❌ Invalid API key. Get your free key at https://rapidapi.com/user/nexaquency"
+        return None, f"❌ Error: {error_msg}"
+
+
+# Gradio UI
+with gr.Blocks(
+    title="NexaAPI — Cheapest AI Image Generation 2026",
+    theme=gr.themes.Soft()
+) as demo:
+    gr.Markdown("""
+    # 🚀 NexaAPI — Cheapest AI Image Generation Demo
+
+    Access 50+ AI models for as little as **$0.003/image** — 5× cheaper than official APIs.
+
+    **Get your free API key:** [https://rapidapi.com/user/nexaquency](https://rapidapi.com/user/nexaquency)
+    | **Docs:** [https://nexa-api.com](https://nexa-api.com)
+    | **GitHub:** [nexaapi-tutorial-2026](https://github.com/diwushennian4955/nexaapi-tutorial-2026)
+    """)
+
+    with gr.Row():
+        with gr.Column(scale=1):
+            api_key = gr.Textbox(
+                label="NexaAPI Key",
+                placeholder="Enter your API key from RapidAPI",
+                type="password"
+            )
+            prompt = gr.Textbox(
+                label="Prompt",
+                placeholder="A red panda coding at a computer, digital art style",
+                lines=3,
+                value="A red panda coding at a computer, digital art style"
+            )
+            model_select = gr.Dropdown(
+                label="Model",
+                choices=list(MODELS.keys()),
+                value="Flux Schnell ($0.003/image) — Fastest"
+            )
+            with gr.Row():
+                width = gr.Slider(512, 1024, value=1024, step=64, label="Width")
+                height = gr.Slider(512, 1024, value=1024, step=64, label="Height")
+            generate_btn = gr.Button("🎨 Generate Image", variant="primary")
+
+        with gr.Column(scale=1):
+            output_image = gr.Image(label="Generated Image", type="filepath")
+            cost_display = gr.Textbox(label="Status & Cost", interactive=False)
+
+    generate_btn.click(
+        fn=generate_image,
+        inputs=[api_key, prompt, model_select, width, height],
+        outputs=[output_image, cost_display]
+    )
+
+    gr.Markdown("""
+    ## 💡 Quick Start
+
+    ```python
+    # pip install nexaapi
+    from nexaapi import NexaAPI
+    client = NexaAPI(api_key="YOUR_API_KEY")
+    print(client.images.generate(model="flux-schnell", prompt="a red panda coding").image_url)
+    ```
+
+    ## 📊 Pricing Comparison
+
+    | Model | NexaAPI | Official | Savings |
+    |-------|---------|----------|---------|
+    | Flux Schnell | **$0.003** | $0.015 | 5× cheaper |
+    | Flux Pro 1.1 | **$0.02** | $0.055 | 2.75× cheaper |
+    | Stable Diffusion 3.5 | **$0.005** | $0.02 | 4× cheaper |
+
+    **Links:**
+    - 🌐 [nexa-api.com](https://nexa-api.com)
+    - 🚀 [RapidAPI Hub](https://rapidapi.com/user/nexaquency)
+    - 🐍 [pip install nexaapi](https://pypi.org/project/nexaapi/)
+    - 📦 [npm install nexaapi](https://www.npmjs.com/package/nexaapi)
+    """)
+
+if __name__ == "__main__":
+    demo.launch()