Posting API for Developers
One REST API to publish content across 17 social platforms. Post text, images, videos, and more with a single endpoint.
No credit card required · Full API access
Features
Everything you need
Multi-Platform Posting
Publish to Twitter/X, Instagram, LinkedIn, TikTok, Bluesky, Mastodon, and 11 more platforms from a single API call. No need to learn each platform's quirks.
Content Scheduling
Schedule posts for any future date and time. RelayAPI handles timezone conversion, queue management, and guaranteed delivery at the exact moment you specify.
Thread & Carousel Support
Create multi-part threads on Twitter/X and Bluesky, or carousel posts on Instagram and LinkedIn. Pass an array of content blocks and we handle the rest.
Platform-Specific Formatting
Automatically adapt content for each platform's constraints — character limits, hashtag placement, mention formatting, and link card generation.
Draft Management
Save posts as drafts, preview how they'll appear on each platform, and publish when ready. Collaborate with your team before anything goes live.
Post Status Tracking
Track every post through its lifecycle — queued, publishing, published, or failed — with detailed per-platform status and direct links to live posts.
Webhook Delivery Notifications
Receive real-time webhooks when posts are successfully delivered or fail on any platform. Build reactive workflows without polling for status.
Automatic Retry Logic
Transient platform failures are automatically retried with exponential backoff. Configure retry policies per post or rely on sensible defaults.
How It Works
Up and running in minutes
Get Your API Key
Sign up and generate your credentials in seconds.
Connect Social Accounts
Link platforms via OAuth with our guided setup flow.
Start Building
Use the API to publish, manage, and track content across all platforms.
Why Developers Choose RelayAPI
One Integration, 17 Platforms
Each social platform has its own auth flow, rate limits, and content rules. RelayAPI abstracts all 17 behind a single REST endpoint so you can focus on your product, not platform quirks.
Enterprise-Grade Reliability
Built on Cloudflare's global edge network with 99.9% uptime. Automatic retries, dead-letter queues, and detailed delivery reports mean your content reaches every platform — every time.
Developer-First Experience
Interactive API docs, TypeScript and Python SDKs, copy-paste code examples, and a responsive support team. Everything you need to integrate quickly and maintain confidently.
Quick Start
Start building in minutes
curl -X POST https:"color:#6a9955">//api.relayapi.dev/v1/posts \
-H "Authorization: Bearer rlay_live_xxxxxxxx" \
-H "Content-Type: application/json" \
-d '{
"content": "Excited to announce our new product launch! Check it out at https:">//example.com",
"platforms": ["twitter", "linkedin", "bluesky"],
"media": [
{ "url": "https:">//cdn.example.com/launch-banner.png", "alt_text": "Product launch banner" }
],
"scheduled_for": "2026-04-01T14:00:00Z"
}'Frequently Asked Questions
Ready to Start Building?
Get your API key and start publishing across 17 platforms in minutes.
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