The Social Media API for Developers in 2026 [Updated Guide]
BulkPublish is a social media API for developers. Every network has its own API, its own auth dance and its own opinion about what a post is. BulkPublish is one API in front of all of them, with the same validation the app runs, so a caption that is too long comes back as an error rather than as a post that never appeared. There are SDKs if you want them and a plain REST API if you do not.
Updated August 2026. The limits, post types and integrations below are read from the app itself every time this site is built.
The networks this audience uses most
These are the networks this page is about, with what BulkPublish can publish to each and the caption length it checks before a post is queued. Every one has a guide of its own.
| Network | What you can post | Caption limit |
|---|---|---|
| X / Twitter | Tweet | 280 characters |
| Post, Gallery, PDF Carousel, and Article | 3,000 characters | |
| Bluesky | Post | 300 characters |
| Mastodon | Post | 500 characters |
That is where this kind of work usually goes, but it is not the limit. BulkPublish publishes to 15 networks in total, and one post can go to every one you have connected in the same click. The rest are:
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Facebook -
Instagram -
TikTok -
YouTube -
Threads -
Pinterest -
Google Business -
Discord -
Telegram -
Tumblr -
Snapchat
What this workflow needs
What you get to build against:
- REST API and SDKs. Everything the app does is available from your own code, with the same checks the app runs before a post is queued.
- RSS autoposting. Point BulkPublish at a feed and every new item becomes a post, on the networks you pick, in the wording you set up.
- Recurring schedules. Set a slot once, daily, weekly or monthly, and posts go out on it without anybody opening the app that morning.
- Bulk publishing. Paste or upload a batch and the whole set is created at once, each post checked against its own network before it is queued.
Working with AI agents
The MCP server is the same API the SDKs use, so an agent you write yourself has exactly the surface your own code does.
BulkPublish runs a hosted MCP server, so an AI assistant can do this work with you instead of you copying its answer into another tab. It exposes 51 tools over OAuth: an agent can see your channels, draft a post, put it in the queue, publish it and read the numbers back afterwards. Nothing to install, no API key to paste.
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Claude -
ChatGPT -
Grok -
Cursor -
Antigravity -
Codex CLI -
Gemini CLI -
Windsurf -
VS Code -
Cline -
Warp -
OpenClaw -
Hermes
Every assistant we support has a setup guide of its own.
Tools worth connecting
BulkPublish already talks to these, and each one has a setup guide.
Getting started
- Create an account. The free plan does not ask for a card.
- Connect the channels in the table above. Each one is a normal sign-in on that network’s own site, and you can disconnect it whenever you like.
- Set the slots you want to post on, or bring a batch in and give each post its own time.
- Look at the queue the next morning. Anything a network refused says so in that network’s own words, and can be sent again.
Common questions
Is there an API key or do I need OAuth?
An API key, made in the app under Settings, then Developer. It is checked as soon as you paste it, so you know at once whether it works.
Which languages have an SDK?
Node and Python, both generated from the same API. Everything else can use the REST API directly, and the reference lists every endpoint.
Can an AI agent use it?
Yes. There is a hosted MCP server, so an agent can draft, queue, publish and read the numbers back over OAuth with nothing to install.
What happens when a network rejects a post?
The post is marked failed with the network’s own reason on it, and it can be retried. Posts that go to several networks record each one separately.
Is there a free plan?
Yes, and it does not ask for a card. The pricing page lists what each plan connects and how much it posts.
Can an AI assistant post for me?
Yes. The hosted MCP server lets an assistant draft, schedule, publish and read your analytics over OAuth, with nothing to install and no key to paste.
Still stuck? The Help Center walks through it step by step.
Other audiences
BulkPublish has a page for each of these too.
Try it
Create an account, connect your channels, and your first post can be scheduled a couple of minutes later. Free plan, no card, cancel whenever you like.