11 Best Social Media Posting APIs for Developers in 2026

A social media posting API lets your own code publish to Instagram, LinkedIn, X, TikTok and the rest through one integration, instead of one per network that you build and keep alive yourself. For posting to brands you run or manage, from scripts, cron jobs, CI or automations, the best one is PostWharf: a REST API with one key per brand workspace, webhooks that report every delivery, a CLI and an MCP server, all on every plan from $15 a month with unlimited channels. Postiz can run on your own server, and for software that posts on behalf of its own users, bundle.social, Outstand, Post for Me, Zernio, Upload-Post and Ayrshare are built for that job. Every price, limit and feature below was read on 16 October 2026.

Pick by what you are building:

• Posting to your own brands, or your clients', from code: PostWharf, $15 a month per brand workspace ($10 billed yearly), unlimited channels.
• Running it on your own server, or reaching Reddit, Discord and Mastodon: Postiz, free to self-host, hosted from $29 a month.
• A free tier to build against: bundle.social (20 posts a month), Upload-Post (10 uploads a month) or Zernio (the first two accounts).
• Paying by post volume with unlimited accounts: Outstand, $19 a month for 3,000 posts, or Post for Me, $10 a month for 1,000.
• SDKs in seven languages for a larger product: Ayrshare, from $149 a month.
• Scripting a Buffer account you already pay for: Buffer's API, included on its Free plan.

Before you choose between building and buying, our free automation ROI calculator works out how many hours a year a posting script saves, what those hours are worth and how many months it takes to pay back, with every formula shown.

What a posting API does, and what to compare

An API is how one program asks another to do something, and every big network has its own: Meta's Graph API for Instagram and Facebook, X's, LinkedIn's, TikTok's and YouTube's. A unified posting API sits in front of them. Your code sends one request with the caption, the media and the target networks, and the service handles each network's sign-in and file rules. Five things set them apart:

• Auth model: one key for accounts you connected yourself, or a flow where your app's customers connect their own accounts and you post for them.
• Billing unit: per brand, per connected account, per post or per channel, which can make the same 30 accounts cost very different amounts.
• Delivery status: a webhook tells your code a post went live or failed, so you are not polling for it.
• Rate limits: how many requests fit in a window, and what happens at the ceiling.
• Tooling: SDKs, a command-line tool and an MCP server for AI assistants.

How we chose and ranked these 11

We started from the APIs on the first results page for "best API for posting to multiple social media platforms" and related searches, the social tools AI answer engines name most for posting questions, and the 12 schedulers we researched for our tools directory. An API made the list if it publishes or schedules posts to at least three social networks when your code calls it, has public developer documentation, and was on sale or free on 16 October 2026 with a published price for a plan that includes the API.

We ordered the list in three steps. First, who it is built for: schedulers with the API, webhooks and CLI on every plan, for posting to brands you run, come first; then APIs for products that post on behalf of their own users; then schedulers whose API sits on a higher plan or has no webhooks we could find. Within each group, an API ranks higher if its API and delivery webhooks come with the entry plan, then if the bill stays flat as you add accounts, then by how many networks it reaches. The order is our editorial judgement on those criteria, and each figure comes from the vendor's own pages or one dated web search per vendor.

Left off: SocialPilot keeps its API on an Enterprise plan with no published price, Sendible's API covers single sign-on only, Agorapulse's open API is for reports, and Later and SocialBee describe no public API. The pages we read did not show which Hootsuite plans include its publishing APIs, or describe publishing through Metricool's or Sprout Social's APIs. Social Champ's own posts give two different prices for its API.

Social media posting APIs compared

The 11 APIs, ranked

11. PostWharf

Best for posting to brands you run or manage from scripts, cron jobs, CI or automations, with a webhook for every delivery and no per-channel feeFree trial · from $10/moPlans and prices

PostWharf is a social media scheduler whose REST API, webhooks, wharf CLI and MCP server come with every plan. Requests carry a workspace key as a bearer token, and each key belongs to one brand workspace and cannot publish to another brand, which keeps clients' channels apart when an agency scripts posting for several. A post can go to any of 10 networks: Instagram, TikTok, X, LinkedIn, YouTube, Facebook, Threads, Pinterest, Bluesky and Telegram. From its developer docs (PostWharf developers, read 16 October 2026):

• Scheduling: publish_at takes an ISO 8601 time with an offset such as +04:00; leave it out to publish straight away.
• Webhooks: delivery.succeeded, delivery.failed and delivery.retrying, plus channel.token_expiring and channel.disconnected, so your code hears about a lapsing token before posts start failing.
• Retries and duplicates: failed deliveries retry on their own, each post is re-checked after publishing with one receipt row per network, and an Idempotency-Key header makes a repeated call return the original post.
• Rate limits: no per-key limit is published. Posts queue against each network's own limits rather than failing, and a 429 comes with a Retry-After header.

It also lists n8n, Zapier and Make among the tools it works with. Billing is per workspace, one brand with unlimited channels: Starter is $15 a month ($10 billed yearly) for one workspace and 200 scheduled posts, Startup $29 ($23) for 3 workspaces and 400 posts, Plus $67 ($54) for 10 and 1,000, and Pro $99 ($79) for unlimited workspaces and 2,500 (PostWharf pricing, read 16 October 2026).

Where it falls short: there is no SDK yet (its docs say one is coming), scheduled posts are capped each month, and Reddit, Discord, Snapchat and WordPress are request-only for now. Its pages describe no flow for your app's own users to connect their accounts, so a product posting for thousands of customers fits numbers 3 to 8 better.

Starter's first seven days are free, and the card is charged when the trial ends. Compare PostWharf's plans to post to every channel a brand runs from your own code, with a receipt for each delivery.

22. Postiz

Best for running the whole stack on your own server, or reaching networks most APIs skip, such as Reddit, Discord and MastodonOpen source · cloud from $23/moPlans and prices

Postiz is an open-source scheduler under the AGPL-3.0 licence, with a public REST API, webhooks, a CLI and an MCP server on every hosted plan. Requests send an API key in the Authorization header, and apps that act for other users can use OAuth2 tokens, which begin with pos_. The official packages are a Node.js SDK (@postiz/node) and an n8n node (n8n-nodes-postiz), and its docs list 34 platforms (Postiz platforms). Only the create-post endpoint is rate limited: 100 requests an hour on the cloud service, the same on every plan, while self-hosters set their own ceiling with API_LIMIT (Postiz public API, read 16 October 2026). Hosted plans are priced by channel: Standard $29 a month ($23 billed yearly) for 5, Team $39 for 10, Pro $49 for 30 and Ultimate $99 for 100, each with a 7-day trial that needs a card (Postiz pricing).

Where it falls short: 100 post creations an hour is tight for a large backfill on the cloud, and self-hosting means registering your own developer app with most networks, which can take weeks for Meta, YouTube and TikTok.

33. bundle.social

Best for building against a free tier, then paying by post volume with unlimited accounts

bundle.social is an API-first service for 14 or more platforms by its own count. Its TypeScript SDK, CLI (bundlesocial-cli) and MCP server (bundlesocial-mcp) are thin layers over one REST API, all authenticated with an API key (bundle.social for AI agents). Each organisation can register five webhooks on every plan. Rate limiting runs three windows at once; a request has to pass all three, and going over returns a 429. Free covers 20 posts, 50 comments and 200 media uploads a month across 3 social sets. Pro is $100 a month ($90 billed yearly) for 10,000 posts and Business $400 ($360) for 100,000, both with unlimited connected accounts (bundle.social pricing, read 16 October 2026).

Where it falls short: the step from free to $100 a month is large for a small project, and its homepage showed a lower free quota (10 posts) than its pricing page, so confirm the number you plan around.

44. Outstand

Best for products with many accounts that post in bursts and would rather pay per post

Outstand bills by volume, not by seat or account: $19 a month includes 3,000 posts, then $0.007 a post up to 10,000 and $0.005 beyond, with unlimited connected accounts; Business, which allows reselling, is $129 a month for 50,000 posts. It reaches 12 platforms, Vimeo, Reddit and Google Business Profile among them. Requests use a bearer token, and Outstand's managed app keys cover seven networks (LinkedIn, Instagram, TikTok, Facebook, Threads, YouTube and Pinterest), so you need no developer app of your own for those; X, Google Business Profile, Vimeo and Reddit need your own app. Webhooks are signed and retried, in one format across networks. It publishes no rate-limit figures, saying requests are queued, throttled and retried on its side (Outstand, read 16 October 2026).

Where it falls short: no free tier and no named SDK (its examples are plain HTTP calls), and reviews from earlier in 2026 quote a different per-post price, so budget from its current page.

55. Post for Me

Best for small SaaS products with many low-activity accounts that want a flat, low bill

Post for Me's Standard plan is $10 a month for up to 1,000 successful posts, with unlimited social accounts, API keys, team members and projects; larger volumes move to custom Enterprise pricing. If you go over, it says it will contact you about upgrading rather than cut you off or charge extra automatically. It covers 9 platforms: TikTok, Facebook, Instagram, X, LinkedIn, Pinterest, Bluesky, Threads and YouTube. Your users can sign in through Post for Me's developer credentials or yours (Post for Me pricing, read 16 October 2026); bringing your own puts your brand on the sign-in screen but leaves each network's app review to you. The API sends webhooks for account and post status, and its code is open source on GitHub.

Where it falls short: 9 networks is the shortest list among the product APIs here, with no Google Business Profile or Reddit, and there is no free plan.

66. Zernio

Best for multi-tenant products that want a free start and pay per connected account

Zernio is built around profiles: one per customer, with their connected accounts inside it and your database keeping the mapping. The API returns an OAuth link to connect each account; in standard mode Zernio hosts the account-picking screen, and in headless mode your own interface does. Requests carry an API key as a bearer token, stored hashed and shown only once. Webhooks include an account.connected event, with delivery logs, redelivery and test sends, and there is a Node.js SDK (@zernio/node), a CLI that manages keys, and an MCP server (Zernio multi-tenant guide, read 16 October 2026). Pricing is per connected account, with every feature included: the first two accounts are free, accounts 3 to 10 cost $6 each, 11 to 100 $3 each and 101 to 2,000 $1 each, and X's own API fees are passed through at cost (Zernio pricing). It supports 15 platforms.

Where it falls short: the bill grows with every account your users connect, and X usage is charged on top.

77. Upload-Post

Best for video-heavy apps that want a free tier and a connect page they can brand

Upload-Post takes an API key in the Authorization header and groups accounts into user profiles, one per user of your platform (Upload-Post user profiles). To link a user's accounts, your backend requests a single-use URL carrying a JWT, which opens a connect page you can brand with your logo and redirect address. An Idempotency-Key header gives exactly-once retries, webhooks report upload status, and the Node.js SDK is the upload-post npm package. Free allows 10 uploads a month on 2 profiles, without TikTok. Paid plans have unlimited uploads, priced by profiles: Basic $24 a month ($16 billed yearly) for 5, Professional $50 ($33) for 25, Advanced $147 ($118) for 75 and Business $438 ($350) for 225. Its limits page lists 10 platforms with a daily cap on each and marks Reddit as unavailable for now (Upload-Post pricing and limits, read 16 October 2026).

Where it falls short: branded linking is not on the Free plan, it gives no requests-per-minute figure, and the price steps up with each block of profiles.

88. Ayrshare

Best for larger products that want SDKs in many languages and comment and analytics endpoints next to publishing

Ayrshare's API covers 14 networks, with SDKs for Node.js, Python, PHP, C#, Go, Java and Ruby, endpoints for comments and analytics as well as posting, and an MCP server. Premium is $149 a month for a single user and up to 14 social accounts, without webhooks. Launch, at $299, adds webhooks, unlimited team members and a 28-day free trial (Ayrshare pricing, read 16 October 2026). Posting for your own users, each with a profile key sent alongside your main API key, is a Business or Enterprise feature, and Business is listed from $599 a month in the same pricing file.

Where it falls short: it has the highest entry price on this list, and delivery webhooks start at $299 a month.

99. Buffer

Best for Buffer customers automating their own queue at no extra costFree plan · from $5/moPlans and prices

Buffer's public API uses GraphQL and comes with every plan, Free included. Keys are personal: the API works with your own Buffer account, covering post creation, scheduling, ideas and channel details for 11 networks by Buffer's count, Mastodon and Google Business Profile among them. Free gets 1 key and 3,000 requests per 30 days, Essentials 3 keys and 7,500, and Team 5 keys and 15,000, each capped at 100 requests per 15 minutes, with a 429 and a wait time when you go over (Buffer API limits, read 16 October 2026). Channels cost $6 each a month on Essentials, or $5 billed yearly (Buffer pricing).

Where it falls short: personal keys mean it is not built for posting to other people's accounts, the pages we read describe no webhooks, and the bill grows with each channel.

1010. Blotato

Best for creators and AI video pipelines that want generation credits and posting on one key

Blotato's REST API authenticates with a blotato-api-key header and posts to nine platforms by its own count. API access is on every paid plan: Starter is $29 a month for 20 connected accounts and 1,250 AI credits, Creator $97 for 40 and Agency $499 for 100. API calls use no credits (those go on AI images and video), there is no per-post fee, and the same key runs its MCP server (Blotato pricing, read 16 October 2026).

Where it falls short: the 7-day trial leaves out the API, and generating a key ends the trial and starts the paid plan. The pages we read describe no webhooks.

1111. Publer

Best for Publer Business customers who want to script their workspaceFree plan · from $4/moPlans and prices

Publer's REST API is for Business and Enterprise customers. You create a key with the scopes you need (workspaces, accounts, posts, media), send it in an Authorization: Bearer-API header, and add a Publer-Workspace-Id header to nearly every request. The default limit is 100 requests per 2-minute sliding window per user account, across all keys (Publer rate limits, read 16 October 2026). Business is $10 a month for one social account ($8 billed yearly) or $21 for three, plus $3 a month per extra member, across 13 networks including Telegram and WordPress (Publer plans).

Where it falls short: no API below Business, a bill that grows per account and per member, and no webhooks in the pages we read.

Build on the networks' own APIs instead?

You can skip the middle layer and call each network yourself. The fees are mostly low; the cost is time:

• Instagram and Facebook: publishing through Meta's API needs an Instagram Business or Creator account, and your app has to pass Meta's app review before it goes live. Each Instagram account can publish 50 posts through the API in a rolling 24 hours, a carousel counting as one (Meta content publishing).
• X: since 6 February 2026, new developers pay per use instead of picking the old Free, Basic or Pro tiers. A plain post costs $0.015 and a post with a link $0.20, drawn from credits bought in advance (X API pricing summary, read 16 October 2026).
• LinkedIn: posting to a personal profile through Share on LinkedIn is self-serve, but a company page needs the Community Management API, which LinkedIn vets: a verified organisation and business email, a screencast of each use case before the Standard tier, and an app of its own (LinkedIn's review guide).
• Tokens: networks expire OAuth tokens every 60 to 90 days, according to PostWharf's docs, so a home-built integration needs a refresh and reconnect path for each one.

Native APIs are workable for one or two networks you know well. Past three or four, a unified API buys back the weeks that go on app reviews and per-network fixes. If all you need is your blog going out on social, a no-code flow may do: our guide to auto-posting a blog with n8n and Claude builds one.

Posting from the command line

A CLI suits cron jobs, CI pipelines and AI coding agents that can run shell commands:

• PostWharf (wharf): install with npm i -g postwharf, then run wharf auth --key ... or set POSTWHARF_API_KEY. wharf post "New reel" --to instagram,tiktok --media ./out/reel.mp4 --at "tue 9am" schedules a post, --dry-run checks one without sending, wharf platforms lists the networks you can target, and wharf status --since 7d sums up recent deliveries. It exits non-zero on failure, so a scheduled job fails where you can see it.
• genviral: npm install -g @genviral/cli adds a genviral command that needs Node 20.19 or later and reads GENVIRAL_API_KEY. Its own blog describes AI image, video and slideshow generation alongside cross-platform posting, scheduling and analytics (genviral on CLIs).
• Postiz, bundle.social and Zernio each ship a CLI over their APIs, covered in their entries above.

Our pick

For posting to brands you run or manage from your own code, use PostWharf: a REST API with one key per brand workspace, delivery webhooks, a CLI and an MCP server on every plan from $15 a month, with unlimited channels. Choose Postiz to self-host. For a product that posts for its users, start on bundle.social's free tier, pay per post with Outstand or Post for Me, or per account with Zernio.

If an AI model writes the captions your API sends, our guide to turning one blog post into five social posts with AI gives the queue five posts from one article, and you can start learning with our free courses for work, which take you through Claude, ChatGPT and prompting step by step.