If you’ve ever built an automation workflow that posts to social media, you know the pain. Each platform has its own API, its own auth flow, its own rate limits, its own quirks. Instagram requires a two-step publish. TikTok demands a consent UI. X has a 280-character ceiling (unless you’re on Premium). Threads caps you at 500 characters. Facebook Pages use a different token model than everything else under the Meta umbrella.
You end up writing and maintaining five or six integrations just to do one conceptual thing: publish a post.
That’s why we built Posbly.
One request. We handle the rest.
Posbly is a single API endpoint that accepts your content and a list of target platforms, then dispatches each post as an independent async job. If Instagram succeeds and X fails, you still get the Instagram post — along with a clear error for X so your workflow can retry or alert.
POST /v1/broadcast
{
"platforms": ["x", "instagram", "facebook_page", "threads"],
"content": {
"text": "Launching today. Here's what we built.",
"media_url": "https://cdn.example.com/launch.jpg",
"media_type": "image"
}
}That’s it. One call. Four platforms. Each job tracked independently, with per-platform status available via polling or webhooks.
We handle the differences between platforms automatically — text truncation for X, JPEG conversion for Instagram, character limits for Threads, scheduling normalization across time zones. You send content once, and we adapt it to what each platform actually accepts.
Built for automation, not for dashboards
Most social media tools are built for marketing teams who want a calendar UI and approval flows. There’s nothing wrong with that, but it’s not what automation builders need.
If you’re wiring up a Make.com scenario, an n8n workflow, or a Zapier zap, you need an API that behaves like a utility: stateless, predictable, well-documented, and cheap enough to call thousands of times without worrying about your bill.
Posbly is that utility. The API is the product. The dashboard exists only because platform app reviews require a working UI — but our real users are workflows, scripts, and AI agents that talk to REST endpoints.
Pay only for what you use
This is the part that matters most to us.
The social media tools market is dominated by subscription pricing. $29/month, $49/month, $99/month — whether you post once or a thousand times. If you’re a developer testing an integration, you’re paying full price during your experimentation phase. If your client pauses their content calendar for two weeks, you’re still paying. If your automation only fires when a blog post is published — maybe three times a month — you’re subsidizing everyone else’s usage.
We think that’s wrong. Not ethically wrong, just structurally misaligned with how automation builders actually work.
Posbly charges per post. From $0.01 per platform post. A broadcast to four platforms costs four post credits. If you don’t post, you don’t pay. It’s that simple.
X (Twitter) posts cost slightly more ($0.015) because X is the only platform that charges us for API access — we pass through the cost transparently rather than hiding it in a flat fee.
There are no seat limits, no “team” tiers, no artificial caps on connected accounts. You connect as many social profiles as your workflow needs. You pay for successful posts. That’s the entire pricing model.
Why pay-per-post makes sense for builders
If you’ve ever used an API that charges per token, per request, or per operation, this model will feel familiar. It’s how Stripe charges for payments, how Twilio charges for messages, how OpenAI charges for completions. Usage-based pricing aligns the cost with the value delivered.
For automation builders specifically, pay-per-post means:
- Testing is cheap. Spin up a workflow, send a few test posts, iterate. Your bill stays under a dollar.
- Scaling is linear. Double your posting volume, double your cost. No surprise tier jumps.
- Idle workflows cost nothing. If your trigger doesn’t fire, your bill doesn’t grow.
- Multi-platform broadcasts are rewarded. The more platforms you hit with a single call, the more value you extract per integration effort.
What we support today
Posbly currently supports publishing to X (Twitter), Instagram (Business and Creator accounts), Facebook Pages, Threads, Pinterest, and TikTok — with LinkedIn and Bluesky on the near-term roadmap.
Each platform integration handles the specific requirements of that platform’s API: two-step publishing for Instagram, consent flows for TikTok, media upload preprocessing, format conversion, and character limit enforcement. You don’t need to know any of that. You send content, we figure out the rest.
What’s next
We’re building native connectors for the major automation platforms — Make.com, n8n, and Zapier — so you can drag Posbly into a workflow without writing any code. We’re also investing heavily in making Posbly the best posting endpoint for AI agents, with llms.txt, a clean OpenAPI spec, and structured error codes designed for machine consumption.
But the core promise stays the same: one request, every platform, pay only for what you use.
If that sounds like the tool you’ve been looking for, grab an API key and start building.