I Built an Autonomous Social Media Agent for $0.01/Month

No manager, no templates, no manual work. Just one Python script and a cron job.

I run a niche SaaS product. It has a small audience and a very specific market. While it’s successful in its own right, I simply don’t have the time to be a social media manager-and I certainly can’t justify paying one for a product that generates a few hundred euros a month.

So, I built an agent to do it for me.

Every Monday at 8:00 AM, it pulls live data from my production database, writes posts, generates branded images, and publishes them to Facebook and Instagram. I don’t touch a thing.

Total monthly cost: about one cent.

Here is exactly how I built it.

The Problem

I know social media matters. I know consistency matters even more. But my typical week is consumed by fixing bugs, shipping features, and handling support.

Usually, around Thursday, I’d realize I hadn't posted anything. I’d open Canva, stare at a blank screen for 10 minutes, get frustrated, and tell myself I’d "do it next week."

Meanwhile, my users were active-signing up, searching for items, and building playlists. I had zero social presence to highlight that growth. I didn't need a scheduling tool; I needed a system.

The Research

In 2026, the automation landscape is crowded. I spent a day vetting the options:

• For posting: Meta Graph API (Free), Buffer/Hootsuite ($6-$49/mo), or Playwright automation (Free but risky).

• For images: DALL-E/Midjourney (AI-generated), Canva API ($13/mo), or HTML templates + Playwright (Free).

• For orchestration: n8n/Make.com (Visual tools), CrewAI/LangGraph (Agent frameworks), or a Python script + Cron (The "keep it simple" route).

I chose the simplest, cheapest option at every single fork in the road.

The Architecture

The stack is lean and mean:

Cron (Monday 8:00 CET)
  → Python script
    → SSH to VPS → query SQLite for real analytics
    → Claude Haiku API → generate 5 posts
    → Playwright → render HTML templates to PNG
    → Meta Graph API → publish to Facebook + Instagram

One script. One cron job. No third-party middlemen.

Decision 1: How to Post

The Meta Graph API was the winner. It’s free, official (zero risk of bans), and offers permanent tokens.

I solved this by SCP-ing images to my VPS and serving them via Caddy. I added these 4 lines to my config:

Code snippet

@social path /social/*
handle @social {
    root * /opt/app/social-assets
    file_server
}

Note: Ensure this handler appears before any catch-all routes like SvelteKit.

Decision 2: Why I Rejected AI Images

Everyone is using DALL-E or Flux right now, but I rejected them for one reason: Text.

AI generators still struggle with reliability, especially with non-Latin text.

Instead, I used HTML templates rendered via Playwright:

1. Design 5 HTML types (stat cards, item spotlights, etc.).

2. Use CSS for branding (dark theme, teal accents).

3. Claude fills the variables; Playwright takes the 1080x1080px screenshot.

The result? Pixel-perfect, brand-consistent, and 100% free.

Decision 3: Brains for $0.01

I use Claude Haiku. It’s the smallest, fastest model from Anthropic. For 5 posts a week, the cost is effectively rounding error.

The magic is in the prompt. I provide:

• Real Data: User counts and trending items from my SQLite DB.

• Brand Voice: "Write like a colleague, no jargon."

• JSON Specs: The exact structure needed for the HTML templates.

The Content Strategy

The agent populates five specific templates every week:

The Results

The system has been live for a week. On its first autonomous run:

• 5 posts generated (highlighting 69 new users).

• 5 branded images rendered in <30 seconds.

• Published to FB and IG perfectly.

• Total Cost: < $0.01.

What’s Next?

While it works, I’m already looking at improvements:

1. Engagement Feedback: Feeding likes/comments back into Claude so it learns what "hits."

2. Stories: Wiring up the Instagram Stories API.

3. Human-in-the-loop: Adding a 30-minute Slack window to "vet" posts before they go live.

The Takeaway

The "teenager stack" (ChatGPT + Canva + Buffer) is fine if you have time. But if you want true autonomy, you have to go one level deeper. The official APIs are free, and a cron job is still the most reliable scheduler ever built.

Sometimes, the best architecture is the simplest one.

I'm Petar Jovanovic founder of AI-native agency where we build niche SaaS products for underserved markets. If you want to dive into the code or build something similar, feel free to reach out!