X (Twitter) - Postbreeze

Quick reference

Field	Value
Character limit	280 per tweet (Premium accounts: 4,000)
Thread length	1–25 tweets
Images per tweet	1–4
Videos per tweet	1
Mixed media	❌ Photos OR video, never both
Image formats	JPEG, PNG, GIF, WebP
Video formats	MP4, MOV
Max image size	5 MB
Max video size	512 MB
Video duration	up to 2:20 (140s), Premium up to 4 hours
Aspect ratio	Any (X auto-crops)
Post types	Tweet, Thread, Reply
First comment	✅ (posted as a self-reply to the root tweet)
Billing	Pay-Per-Use — $0.01 per write call

See also: Platform settings — X and Media uploads.

Before you start

X moved to Pay-Per-Use billing in February 2026 for new signups. Every tweet write is metered at

0.01 (regular) or

0.02 (write with URL). Postbreeze tracks this per-account and reports it via the Stripe meter.The first-comment feature on X doubles the cost per scheduled post — the main tweet + the self-reply are two separate writes.

The X access token is short-lived (~2 hours) but Postbreeze refreshes it transparently on a 30-minute tick. You don’t have to do anything other than connect once. Required scopes (already granted by the connect flow):

tweet.read, tweet.write, users.read, offline.access — base posting + refresh.
media.write — uploading images and videos.

Quick start

Workspace is inferred from your API key — no workspaceId argument. The flat shape (content + platforms) covers the common case; drop to the nested shape at the end of this page when you’d rather pass everything as targets.

SDK

import Postbreeze from "@postbreeze/node";

const postbreeze = new Postbreeze({ apiKey: process.env.POSTBREEZE_API_KEY! });

await postbreeze.posts.create({
  content: "Shipped a new dashboard today 🚀",
  scheduledFor: new Date(Date.now() + 30_000).toISOString(),
  mediaItems: [{ type: "image", url: "https://cdn.example.com/screenshot.png" }],
  platforms: [{ accountId: "soc_x_…" }],
});

With X-specific options

Set replySettings (or any other X field) under platformOptions on the target. The discriminator platform: "X" is required.

import Postbreeze from "@postbreeze/node";

const postbreeze = new Postbreeze({ apiKey: process.env.POSTBREEZE_API_KEY });

const post = await postbreeze.posts.create({
  content: "Shipped a new dashboard today 🚀",
  scheduledFor: new Date(Date.now() + 30_000).toISOString(),
  mediaIds: ["med_image_…"],
  platforms: [{
    accountId: "soc_x_…",
    platformOptions: {
      platform: "X",
      replySettings: "everyone",
    },
  }],
});

Content types

Single tweet

Plain text, plus up to 4 images OR 1 video.

Thread

Pass threadParts under platformOptions. content is the root tweet (the first one posted); each entry in threadParts is chained as a reply to the previous one, so threadParts[0] becomes the second tweet. Up to 25 parts, each ≤ 4,000 chars.

const post = await postbreeze.posts.create({
  content: "Five lessons from shipping our first SaaS 🧵",
  scheduledFor: new Date(Date.now() + 30_000).toISOString(),
  platforms: [{
    accountId: "soc_x_…",
    platformOptions: {
      platform: "X",
      replySettings: "everyone",
      threadParts: [
        "1. Ship before it feels ready.",
        "2. Pricing is product. Spend a week on it.",
        "3. Talk to ten customers. Then ten more.",
        "4. Boring tech > exciting tech.",
        "5. The 'simple version' usually wins.",
      ],
    },
  }],
});

Reply

Pass replyToId (the tweet id you’re replying to). The post becomes a reply rather than a top-level tweet.

platforms: [{
  accountId: "soc_x_…",
  platformOptions: {
    platform: "X",
    replySettings: "everyone",
    replyToId: "1789012345678901234",
  },
}]

Media requirements

Images

Property	Requirement
Images per tweet	1–4
Formats	JPEG, PNG, GIF, WebP
Max file size	5 MB
Animated GIF	✅ (counts as the single allowed video)
Min resolution	4 × 4
Max resolution	8192 × 8192

Videos

Property	Requirement
Videos per tweet	1
Formats	MP4, MOV
Max file size	512 MB
Max duration	140 seconds (Premium: 4 hours)
Aspect ratio	1:3 to 3:1
Codecs	H.264 (baseline / main / high), AAC
Resolution	32 × 32 min, 1920 × 1200 max
Frame rate	up to 60 fps

For URL ingest vs pre-uploaded mediaIds, see Media uploads.

Platform-specific fields

Full reference: Platform settings — X.

Field	Type	Required	Description
`platform`	`"X"`	Yes	Discriminator.
`replySettings`	`"everyone"` \| `"following"` \| `"mentionedUsers"`	No (default `everyone`)	Who can reply to the main tweet.
`threadParts`	string[]	No	Additional tweet bodies. Each ≤ 4,000 chars, up to 25 total. `content` is the root tweet; `threadParts[0]` becomes the second tweet.
`replyToId`	string	No	If set, the tweet posts as a reply to this tweet id.

First comment

Pass firstComment on the platform target. Postbreeze posts it as a self-reply to the root tweet — even in a thread, it always replies to content, not to the last threadParts entry.

platforms: [{
  accountId: "soc_x_…",
  platformOptions: { platform: "X", replySettings: "everyone" },
  firstComment: "Link to the full write-up in the next reply 👇",
}]

Reply-settings conflict: if replySettings is following or mentionedUsers AND firstComment is set, the author can’t actually reply to their own tweet (X returns 400 Invalid reply settings). Postbreeze auto-relaxes the main tweet’s replySettings to everyone server-side when both are present — the X tab in compose shows a banner about this.

Analytics

Metric	Available
Impressions	✅ (≤ 30 days old)
Likes	✅
Retweets	✅
Replies	✅
Bookmarks	✅
Followers (account)	✅
Tweet count (account)	✅
URL clicks	✅ (≤ 30 days, owned tweets only)
Profile clicks	✅ (≤ 30 days, owned tweets only)
Video views	✅

Refresh cadence: every 12 hours. Gated behind X_ANALYTICS_ENABLED env on the Postbreeze server (off by default so deploys don’t accidentally bill the customer for analytics they didn’t ask for). When off, the analytics page shows a “warming up” banner.

Common errors

Error	Meaning	Fix
`X_RATE_LIMITED`	App or user rate limit hit	Postbreeze retries with the `Retry-After` value X returns.
`X_DUPLICATE_TWEET`	Identical tweet body posted recently	Vary the text or wait. X enforces this aggressively on near-identical content.
`X_MEDIA_TOO_LARGE`	Image > 5 MB or video > 512 MB	Compress before uploading.
`X_MIXED_MEDIA`	Images + video in `mediaIds`	Pick one.
`X_TOO_MANY_IMAGES`	> 4 images	Trim to ≤ 4.
`X_INVALID_REPLY_SETTINGS`	First-comment + restricted `replySettings` (handled, but surfaces as a fallback)	Postbreeze forces `everyone` automatically.
`X_TOKEN_EXPIRED`	Refresh token rejected by X (`invalid_grant`)	Reconnect. The dashboard’s Account Health dialog explains the exact reason from X.
`X_PAYMENT_REQUIRED`	Workspace doesn’t have a payment method but X is Pay-Per-Use	Add a card in Settings → Billing.

What you can’t do

❌ Schedule via X’s native scheduler (we use our own queue)
❌ Mix images and video in one tweet
❌ Edit a tweet after publish (Premium feature; not exposed by the API)
❌ Tag a location
❌ Add a poll
❌ Quote-tweet from a scheduled post (use replyToId for a reply chain instead)
❌ Spaces (audio rooms) — not in the API

Full control: nested shape

If you’d rather use the nested request body (caption + targets instead of content + platforms), the same X options apply. Pick one shape per request — don’t mix.

Node.js

const post = await postbreeze.posts.create({
  caption: "Shipped a new dashboard today 🚀",
  scheduledAt: new Date(Date.now() + 30_000).toISOString(),
  mediaIds: ["med_image_…"],
  targets: [{
    socialAccountId: "soc_x_…",
    platformOptions: {
      platform: "X",
      replySettings: "everyone",
      threadParts: [
        "Why we rebuilt it from scratch ↓",
        "The old one was a Rails monolith from 2019.",
      ],
    },
    firstComment: "Changelog in the next reply 👇",
  }],
});

​Quick reference

​Before you start

​Quick start

​With X-specific options

​Content types

​Single tweet

​Thread

​Reply

​Media requirements

​Images

​Videos

​Platform-specific fields

​First comment

​Analytics

​Common errors

​What you can’t do

​Full control: nested shape

Quick reference

Before you start

Quick start

With X-specific options

Content types

Single tweet

Thread

Reply

Media requirements

Images

Videos

Platform-specific fields

First comment

Analytics

Common errors

What you can’t do

Full control: nested shape