xbird — Twitter/X for AI Agents

Agent skills that give AI agents 247 Twitter/X tools — reading, searching, posting, engagement, media upload — across 3 integration protocols.

No Twitter developer account, no API keys, no OAuth.

Skills

Skill	Protocol	Best For
xbird	MCP (stdio)	Claude Code, Cursor, Windsurf — local MCP tools
xbird-rest-api	REST + x402	Backend services, autonomous agents, any HTTP client
xbird-acp	ACP (Virtuals)	Agent-to-agent commerce on Virtuals Protocol marketplace

Which skill to use?

Running in Claude Code / Cursor / Windsurf?
  → xbird (MCP)

Building a backend service or autonomous agent?
  → xbird-rest-api (x402 micropayments, USDC on Base)

Operating on Virtuals Protocol marketplace?
  → xbird-acp (E2E encrypted credentials, ECDH + AES-256-GCM)

Quick Install

Claude Code Plugin

/plugin install checkra1neth/xbird-skill

Agent Skill (works with 35+ agents)

npx skills add checkra1neth/xbird-skill

MCP Server Only

Bun (recommended) — auto-detects browser cookies:

claude mcp add xbird -- bunx @checkra1n/xbird

Node.js — requires one-time login:

claude mcp add xbird -- npx @checkra1n/xbird
npx @checkra1n/xbird login  # paste auth_token + ct0 from x.com DevTools

A payment wallet is generated automatically on first run.

	Bun (bunx)	Node.js (npx)
Browser cookies	Auto-detected	Manual login required
Setup	Install Bun, done	One-time login command
Startup	Faster	Slower (npm registry check)

CLI

# Save Twitter credentials locally
npx @checkra1n/xbird login

How It Works

MCP (Local)

AI Agent (Claude Code / Cursor / Windsurf)
  |  MCP stdio
@checkra1n/xbird (local process)
  |-- Auto-detect Twitter cookies from browser
  |-- Pay x402 --> xbird server (payment only)
  '-- Execute --> Twitter API (your residential IP)

The xbird server only verifies payments. All Twitter API calls happen locally from your machine.

REST API (Stateless)

Your Backend / Agent
  |-- npx @checkra1n/xbird login  -->  generates stateless token locally
  |-- GET /api/search + token     -->  xbird server
  |<-- 402 Payment Required       <--  (challenge)
  |-- x-payment header (signed)   -->  (auto via @x402/fetch)
  |<-- 200 { data, cursor }       <--  (result)

Fully stateless server — no database, no stored credentials. The token is self-contained (xbird_sk_<key>.<ciphertext>.<iv>), decrypted per-request then discarded.

ACP (Virtuals Protocol)

Buyer Agent
  |-- ECDH key exchange  -->  xbird TEE (attestation)
  |-- Encrypted credentials + job  -->  Virtuals relay (claw-api)
  |-- Job lifecycle: REQUEST → NEGOTIATION → TRANSACTION → COMPLETED
  |<-- Deliverable with results

End-to-end encrypted credentials (ECDH P-256 + AES-256-GCM). The Virtuals relay transports only opaque ciphertext.

Pricing

Resource catalog billing (~2× cheaper than X API pay-per-use per unit):

Resource	Rate/unit	Count-aware	Examples
post_read	$0.0025	yes (default 20, max 100)	get_tweet, search_tweets, get_replies
user_read	$0.005	yes	get_user, get_followers
owned_read	$0.001	yes	get_bookmarks, get_home_timeline
post_create	$0.0075	no	post_tweet, reply_to_tweet
interaction_create	$0.0075	no	like_tweet, follow_user
content_create	$0.005	no	upload_media

Comparison with X API

Example session (9 calls, count=20 on search/lists):

Call	xbird	X API
search_tweets count=20	$0.05	$0.10
get_tweet ×3	$0.0075	$0.015
get_user	$0.005	$0.010
get_replies count=20	$0.05	$0.10
post_tweet	$0.0075	$0.015
like_tweet	$0.0075	$0.015
upload_media	$0.005	$0.015
Total	~$0.13	~$0.26

Both bill per resource unit — xbird unit rates are ~2× lower.

Security

Protocol	Credential Protection
MCP	Auto-detected from browser, never leave your machine
REST x402	Fully stateless — encrypted in self-contained token, server stores nothing
ACP	ECDH P-256 + AES-256-GCM end-to-end encryption (relay-blind)

Skill Structure

Each skill follows Anthropic's best practices — concise SKILL.md (<500 words) with heavy reference in separate files.

skills/
├── xbird/                   # MCP (local tools)
│   ├── SKILL.md             # Setup + workflows + common mistakes
│   └── tools.md             # 247 MCP tools reference
├── xbird-rest-api/          # REST API + x402 micropayments
│   ├── SKILL.md             # Setup + auth + example + common mistakes
│   ├── endpoints.md         # Full endpoint tables with pricing
│   └── x402-flow.md         # Payment flow + stateless token
└── xbird-acp/               # ACP (Virtuals marketplace)
    ├── SKILL.md             # Setup + example + common mistakes
    ├── encryption-flow.md   # ECDH P-256 + AES-256-GCM details
    └── polling.md           # Job lifecycle + polling strategies

Compatibility

Client	Install Method
Claude Code	/plugin install checkra1neth/xbird-skill
Claude Desktop	npx @checkra1n/xbird as MCP command
Cursor	npx @checkra1n/xbird as MCP command
Windsurf	npx @checkra1n/xbird as MCP command
Smithery	npx -y @smithery/cli install @checkra1neth/xbirdmcp
Any MCP client	bunx @checkra1n/xbird / npx @checkra1n/xbird

Distribution

Platform	Install
npm	@checkra1n/xbird
Claude Code Plugin	/plugin install checkra1neth/xbird-skill
skills.sh	npx skills add checkra1neth/xbird-skill
Smithery MCP	@checkra1neth/xbirdmcp
Smithery Skill	checkra1neth/xbird
SkillsMP	skillsmp.com
Website	xbird.dev

License

MIT