Post to X (Twitter) via API: the X API v2, handled for you (2026)

How X (Twitter) posting works

X (formerly Twitter) exposes the X API v2. Posting requires OAuth 2.0 with the tweet.write scope and, depending on volume, a paid API tier. You authenticate each account, then create posts (text, with optional media).

PostWire will manage the OAuth, token refresh and posting so you publish to X the same way you publish everywhere else — one call.

Smart Distribute: thread-friendly text with the link in a reply

PostWire's Smart Distribute turns a single prompt (plus optional media) into the best native post for every network — never the same text everywhere, which every algorithm penalizes. For X it writes thread-friendly text within the character limit and puts the link in a reply (so reach isn't throttled for an outbound link), while it simultaneously reframes the same idea for TikTok, YouTube, LinkedIn and the rest. AI generation is included free on every plan (you pay for brands, not per post) and is one MCP tool (generate_posts) or one REST call (POST /api/generate).

Honest status

PostWire's X integration — OAuth2 (PKCE) connect, REST endpoint and MCP tool — is fully built. Activating it requires a paid X API tier (X charges for write access), so X turns on once that's in place; it's a one-word change in your platforms array, no new SDK. Bluesky, Telegram, Mastodon and Discord are live today and YouTube is rolling out — create your free account and start posting now.

1. Connect a X (Twitter) account (OAuth)

X (Twitter) uses OAuth, not a password. Your user connects in the dashboard, or you generate the authorization URL via the API:

curl -X POST https://postwire.io/api/oauth/x/url \
  -H "Authorization: Bearer $POSTWIRE_API_KEY"
# -> { "url": "https://.../oauth/authorize?..." }
# The user opens the URL, approves, and PostWire stores the token (and refreshes it for you).

2. Publish with one REST call

Once connected, posting is a single request. Add more networks by putting more strings in platforms.

curl -X POST https://postwire.io/api/post \
  -H "Authorization: Bearer $POSTWIRE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"platforms":["x"],"text":"Shipping PostWire today 🚀"}'

3. Or let an AI agent post it (MCP)

PostWire ships a first-class MCP server — not docs-only. Add it to any MCP client:

{
  "mcpServers": {
    "postwire": {
      "command": "npx",
      "args": ["-y", "postwire-mcp"],
      "env": { "POSTWIRE_API_KEY": "pw_live_xxx" }
    }
  }
}

Then the agent just calls the tool:

{
  "name": "post_to_social",
  "arguments": { "platforms": ["x"], "text": "Shipping PostWire today 🚀" }
}

X (Twitter) via API: build it yourself vs PostWire

Pricing: flat per brand

Running 50 brands on Ayrshare costs roughly $779 — and its MCP is docs-only, so an agent can't actually post. See PostWire vs Ayrshare.

FAQ

Can I post to X (Twitter) via API?

Yes. X exposes the X API v2 with OAuth 2.0 and the tweet.write scope. PostWire will wrap the OAuth and posting behind one REST call and one MCP tool, the same shape as every other network it supports.

Does the X API cost money?

X's API has free and paid tiers depending on volume and features. PostWire's own pricing stays flat per brand regardless. Check X's current developer terms for their API tier limits.

Is X live on PostWire yet?

Not yet — X is on the roadmap. The unified endpoint and MCP tool are already defined, so it's a one-word change when it ships. Bluesky, Telegram, Mastodon and Discord are live now.

How will an AI agent post to X?

Through PostWire's MCP server (postwire-mcp): the agent calls post_to_social with platforms set to x and the text. PostWire will handle the X API v2 OAuth and posting and return the result.

How much will posting to X cost on PostWire?

Flat per-brand pricing: Free $0 (1 brand, 30 posts), Starter $9, Pro $29, Agency $99 for 50 brands, Scale $299 — X included on paid plans when it launches.