BestPostAPI
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Central posting API hub distributing content across a network of social platforms

Find the Best Social Media Posting API

We tested 20 schedulers & APIs so you don't have to. Compare pricing, rate limits and video specs — updated July 2026.

Take the 60-second Finder quizCompare all 20 tools

20 tools tested · 3 languages · Updated monthly

Our top 3 picks

The tools we recommend most often in 2026.

Upload-Post

4.7
from$16/mo

Low-cost posting API with unlimited uploads and server-side FFmpeg that does real video work.

Best value API — unlimited uploads with real video processing.

  • $16/month remains one of the cheapest real API entry points
  • Unlimited uploads on the entry plan
  • Server-side FFmpeg saves prep work on video-heavy workflows
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Zernio

4.8
from$6/mo

API-first posting stack for teams that need scale, structured errors, and a real MCP server.

Best for AI agents and scale — native MCP server with 280+ tools.

  • Full REST API on every plan
  • 1,200 req/min is high enough for serious automation
  • Native MCP server with 280+ tools
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Metricool

4.6
from$20/mo

Strong free plan, serious reporting, and a paid upgrade path that makes sense for agencies.

Best free plan and analytics — a real workflow, not a demo.

  • One of the few free plans that feels complete
  • Analytics depth is ahead of Buffer and Publer
  • Per-brand pricing works well for agencies
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Browse by use case

Jump straight to the comparison that matches your setup.

Best social media posting APIs

Developer-first tools with real REST APIs, webhooks and SDKs.

Best scheduler for agencies

Multi-brand dashboards, approvals and white-label options.

Best free social media scheduler

Generous free plans that actually cover a full workflow.

Best API for AI agents

MCP servers, high rate limits and structured metadata.

Platform video specs cheat sheet

The limits your video pipeline has to respect in 2026.

PlatformMax file sizeMax durationAspect ratioNotes
TikTok4 GB10 min9:16MP4/MOV/WebM. Chunked upload of 5–64 MB slices required for large files.
Instagram Reels300 MB90 s9:16H.264, AAC. Cover frame recommended.
Instagram Stories100 MB60 s9:16Split longer clips into 15 s segments automatically.
YouTube256 GB12 h16:9API quota: 1,600 units per upload, 10,000 units/day. Shorts must be under 60 s.
X / Twitter512 MB140 s16:9 o 1:1Chunked media upload endpoint. 512 MB hard cap even on paid tiers.
LinkedIn5 GB15 min16:9Vector Assets API required for anything over 200 MB.
Threads1 GB5 min9:16 / 1:1No video carousels — post videos individually.
Bluesky1 MB (images)60 s (video)anyImages must be under 1 MB — pre-compress on the server.

Managing 50 channels?

Prices for the same job range from $99 to $350 per month depending on the tool. Our calculator shows exactly where you'll land.

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Frequently asked questions