How I Built an AI API Wrapper Backend in 30 Minutes - Would You Pay USD 79 for This?

Xu Kaichao — Thu, 30 Apr 2026 14:34:16 +0000

The 2-Day Problem I Solved in 30 Minutes

Every time I start a new AI project, I spend 2-3 days on the same stuff: API key management, token counting, user rate limiting, and switching between models.

Last week I said "enough" and built a reusable backend template.

What It Does

One endpoint, any model — Swap between DeepSeek, OpenAI, Claude by changing one config line
API key encryption — Keys never touch your frontend code
Token billing built-in — Per-user usage tracking with quota system
Docker deploy — One command to production

The Code (Core)

# api_router.py — the heart of it
from fastapi import FastAPI, Depends
from core.auth import get_current_user
from core.billing import check_quota, deduct_tokens
from core.gateway import AIProvider

app = FastAPI()

@app.post("/api/generate")
async def generate(
    prompt: str,
    model: str = "deepseek-v4-pro",
    user = Depends(get_current_user)
):
    if not check_quota(user.id, estimated_tokens=500):
        raise HTTPException(402, "Quota exceeded")

    provider = AIProvider(model=model)
    result = await provider.complete(prompt)

    token_cost = len(result["usage"]["total_tokens"])
    deduct_tokens(user.id, token_cost)

    return {"text": result["content"], "tokens_used": token_cost}

Why I'm Posting This

I'm thinking of packaging this as a product. Full template with auth, billing, admin dashboard, Docker deployment — ready to clone and ship your AI app in 30 minutes.

Question to the community: Would you pay $79 for this? Or is it something you'd rather build yourself?

Be honest. If 10 people say they'd buy it, I'll launch it next week.

Tags: #saas #ai #webdev #startup #discuss

5 AI Prompts That Save Me 10 Hours of Content Creation Every Week

Xu Kaichao — Thu, 30 Apr 2026 08:40:49 +0000

I used to stare at a blank screen every morning wondering what to post.

Not anymore. I built a system using AI prompts that turns ONE idea into a week of content across LinkedIn, Twitter, and email.

Here are 3 of my favorites (free to use):

1. The "One Idea → 5 Posts" Prompt

Take this topic: "[YOUR TOPIC]"
Create 5 content angles:
1. A contrarian take (go against common advice)
2. A personal story (share a failure or lesson)
3. A how-to (step-by-step, actionable)
4. A question (provocative, invite discussion)
5. A curation (3 resources/tools + why)
Make each angle unique and platform-ready.

Why it works: This prompt kills the "what do I post today" problem. One idea becomes a week of content instantly.

2. The "LinkedIn Hook Factory"

Write 5 LinkedIn opening hooks for this topic: "[TOPIC]"
Rules:
- Hook must fit in one line on mobile
- Use curiosity, numbers, or a bold claim
- No clickbait cliches

Why it works: If your first line doesn't grab, nothing else matters. This prompt makes sure someone actually reads past line 1.

3. The "Repurpose Everything" Prompt

I have a [BLOG POST / VIDEO / THREAD] about [TOPIC].
Turn it into:
- 3 tweets (short, punchy)
- 1 LinkedIn post (professional, story-driven)
- 1 email newsletter intro
Keep the core message. Adapt the tone for each platform.

Why it works: Most creators do the hard work once and let it die. This prompt turns one piece of content into a distribution machine.

I've collected 50 of these prompts covering LinkedIn, Twitter, Instagram, Email, Blog, and more. Each one comes with platform-specific formatting, tone guides, and ready-to-use templates.

If you're tired of the daily "what do I post" stress, you can grab the full pack here:
https://content-multiplier.surge.sh

$19, lifetime access, 30-day refund if it doesn't save you time.

What's your go-to content hack? Drop it in the comments.

DEV Community: Xu Kaichao