Which social media APIs support multi-platform posting?
A practical breakdown of unified posting APIs vs. native APIs — what they cost, what they cover, and which one fits your build.
The question sounds simple: pick an API, wire up your platforms, ship. But anyone who has tried to stitch together five native APIs knows the maintenance overhead alone can eat a sprint. We looked at the current field of unified posting APIs and compared them against going direct to the platform — here is what the options actually look like.
Two categories cover the field. Unified posting APIs (Buffer, Ayrshare, Postiz, Post for Me, Zernio, Outstand) give you a single endpoint that handles LinkedIn, Instagram, TikTok, Facebook, and 6-25 other platforms in one call. Native platform APIs are free or near-free but require you to maintain 8-11 separate integrations and absorb every breaking change yourself. If you need to ship in days and stay focused on your core product, unified wins. If you need deep platform-specific features and have the engineering bandwidth, native is viable.
Unified API vs. native APIs: the real tradeoff
The conventional developer instinct is to go direct. Native APIs are free, authoritative, and give you access to every feature the platform exposes. What they don't give you is a stable contract.
Meta's Graph API has had four major versioning cycles in three years. X's API moved to pay-per-use in February 2026, and posts containing URLs now cost $0.20 per request. LinkedIn regularly adjusts rate limits and OAuth scopes with 30-to-60-day deprecation windows. If you are building a product where social publishing is the core feature, you want to absorb that complexity. If social publishing is a component of a larger product, you are taking on full-time platform maintenance work that does not move your product forward.
Unified APIs absorb that maintenance. When X changed its pricing model, Ayrshare updated its abstraction layer and pushed a changelog. Developers who had built on top of native X API had to rebuild billing logic, request flows, and error handling themselves.
The tradeoff is a monthly fee and one extra layer in your stack. For most B2B product teams, that is a trade worth making.
The six unified API options
Buffer API
Buffer's API is the only free-tier unified option in this list. It supports 11 channels: Instagram, Facebook, LinkedIn, TikTok, X, Threads, Bluesky, Pinterest, YouTube, Google Business Profile, and Mastodon. Access is available on Buffer's free plan, though authentication is personal-key-only, which limits it to single-account integrations or internal tooling.
For teams vibe-coding a lightweight workflow or building a personal tool, Buffer's API is the logical starting point. The channel coverage is solid for B2B use cases where LinkedIn, X, and Threads are the channels that matter. The constraint is API key architecture: you cannot easily build multi-tenant SaaS on top of it without additional abstraction.
Ayrshare
Ayrshare is the most widely referenced unified posting API among developers who have actually shipped products on top of one. It supports 9+ platforms through a single REST endpoint, handles OAuth per-user profiles cleanly, and is designed for multi-tenant architectures out of the box.
Pricing runs from a developer tier (~$29/month) up to Business at $599/month, with the higher tiers unlocking higher profile limits and analytics. The documentation is thorough and the API is stable enough that integrations built 18 months ago generally still work with minimal maintenance.
If you are building B2B SaaS where users connect their own social accounts, Ayrshare is the default choice for most teams we have seen make this decision.
Postiz
Postiz is the only fully open-source option in the field. It supports 30+ platforms, which is more coverage than any other unified API in this list, and ships both self-hosted and cloud versions.
The self-hosted path eliminates monthly SaaS fees entirely, though you absorb the ops overhead and, critically, the maintenance responsibility when upstream platforms change. For teams with strong DevOps capability and a compliance reason to avoid third-party SaaS, Postiz is worth serious consideration. For lean teams, the operational lift offsets the cost savings faster than it looks on paper.
Post for Me
Post for Me targets the workflow-automation segment rather than developers building new products. It positions itself as an API layer for no-code and low-code builders, with integrations that drop into Zapier and Make alongside direct API access.
Platform coverage is narrower than Postiz or Ayrshare, sitting around 9-12 channels depending on the plan. Pricing is available at a lower entry point than Ayrshare, which makes it viable for solo operators or small teams testing multi-platform distribution before committing to a more robust solution.
Zernio
Zernio is a newer entrant focused on media-rich posting, with particular attention to video scheduling across TikTok, YouTube Shorts, and Instagram Reels. If your use case is primarily video content distribution rather than text or image posts, Zernio's feature set maps more cleanly to that workflow than general-purpose unified APIs.
The platform is earlier-stage than Buffer or Ayrshare, which means the documentation and community support are thinner. Teams building on it today are early adopters; expect to work through rough edges.
Outstand
Outstand combines content creation tooling with its publishing API, which makes it a different product category than the others in this list. It is less relevant for teams who already have content generation handled and just need a reliable posting layer, but worth knowing about if your use case includes automated content generation plus distribution.
Native platform APIs: what they cover and what they cost
For teams who need full platform depth, here is the current state of each native API:
Meta Graph API covers Instagram and Facebook in a single integration. Free for most use cases. Versioning is aggressive, so plan for quarterly maintenance. Required for Instagram Story posting, which unified APIs often do not fully support.
LinkedIn API is free for approved use cases. OAuth scopes have narrowed over the past two years, and the approval process for organizational posting access has more friction than it used to. Plan 2-4 weeks for access approval.
TikTok Content Posting API is free but operates under a strict content policy review. Access approval timelines vary, and TikTok reserves the right to revoke access for policy violations that are not always clearly defined.
YouTube Data API is free up to 10,000 units per day, with each video upload consuming 1,600 units. For high-volume use, you will hit the quota faster than expected and need to apply for a quota increase.
X API (formerly Twitter) is no longer free for posting. As of February 2026, any post containing a URL costs $0.20 per request. For most B2B use cases, this makes native X integration a line-item cost that needs to be modeled explicitly.
Pinterest, Threads, Bluesky are all free and relatively stable. Bluesky's AT Protocol is developer-friendly and the API documentation is among the clearest in this group.
How to choose
The decision is mostly a function of your build context:
If you are an operator or founder building a lightweight internal tool or testing a workflow, Buffer's free API tier covers the primary B2B channels and gets you running without a monthly commitment.
If you are building multi-tenant B2B SaaS where users connect their own accounts, Ayrshare is the most production-tested choice. The cost ($29-$599/month) is real, but so is the development time you avoid maintaining 8+ platform integrations.
If compliance or data residency requirements rule out third-party SaaS, Postiz self-hosted is the only real option. Budget for the operational overhead.
If video-first distribution is your core use case, evaluate Zernio alongside Ayrshare rather than defaulting to the market leader.
If you need deep platform-specific features that unified APIs do not expose (Instagram Story interactivity, LinkedIn document carousels, TikTok duets), native APIs are necessary regardless of the maintenance cost. Most B2B publishing use cases do not need those features, but it is worth auditing your requirements before you decide.
One thing worth noting for B2B founders specifically: the channel that generates the most pipeline per post for most of the operators we work with is LinkedIn, not the platforms requiring the most technical investment. If you are building distribution infrastructure for a B2B audience, LinkedIn engagement strategy and how founders are actually building inbound through LinkedIn are worth reading alongside the API selection decision. The best posting infrastructure in the world does not fix a weak content-to-audience fit.
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The best posting infrastructure does not fix a weak content-to-audience fit. Know which platforms your buyers actually use before you architect for all of them.
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The maintenance question no one prices upfront
Every unified API comparison we have seen focuses on features and pricing at signup. The number that matters more is: how many platform-breaking API changes happened in the last 12 months, and who absorbed them?
In 2025, by our count: Meta deprecated two API versions, X restructured its access tiers twice, LinkedIn changed OAuth scopes for organizational posting, and TikTok modified its video upload flow. If you are on native APIs, that is at minimum four incidents requiring developer attention, each with some probability of taking down your posting functionality while you investigate.
Unified API providers absorb those incidents as part of their service. Ayrshare and Buffer both pushed changelog updates during the X tier changes without requiring customer-side code changes. That is the actual value proposition, and it compounds over time as platforms become more volatile, not less.
For B2B teams where LinkedIn is the primary channel: the LinkedIn API is free, relatively stable, and approved use cases cover the vast majority of B2B posting scenarios. If LinkedIn is your only target platform, native is a reasonable choice. If you are distributing across three or more platforms, the maintenance math favors a unified API before the end of your first year.
Frequently asked
Buffer's API is the only free unified posting option that covers multiple platforms from a single endpoint. It supports 11 channels including LinkedIn, Instagram, TikTok, X, Facebook, Threads, and YouTube. Postiz also has a free self-hosted option, but you absorb your own infrastructure and maintenance costs. Native platform APIs (Meta, LinkedIn, TikTok, YouTube, Pinterest, Bluesky) are free individually, but you maintain each integration separately and handle all breaking changes yourself.
