Skip to main content
Changes to the OnlyX API (https://api.onlyx.ai/v1) and the OnlyX MCP server (https://mcp.onlyx.ai/mcp). Subscribe with the RSS button to hear about new releases. We keep /v1 backward compatible: we add endpoints, fields and error codes, but we do not remove or rename them within v1. Build your integration to ignore fields it does not know.
​
LaunchAPIMCP
v1.0: the OnlyX API and MCP server launch

​
The OnlyX API and MCP server are live

API keys and OAuth
  • Workspace-owned API keys (onx_sk_...) created in Settings → API & MCP by owners and admins, with 15 scopes, Full access and Read only presets, optional creator restrictions and expiry, and immediate revocation. Keys are stored hashed and shown once.
  • OAuth 2.1 with PKCE, automatic client registration and a consent screen, so AI assistants connect without copying a key. Every connection is listed under Connected apps.
Creators and connecting
  • Add creators with POST /v1/creators, send them a one-time connect link, and follow the sign-in with GET /v1/creators/{creatorId}/connection. Creators sign in themselves with the OnlyX Login app on iPhone, Mac or Windows, including OnlyFans’ face verification.
  • Turn the AI on or off per creator.
Inbox
  • Conversations with filters and counts, message history, hand-offs.
  • Send text, free vault media and paid messages with a required Idempotency-Key, and follow delivery (queued, sent, failed, unconfirmed, not_sent).
  • Take over, release, and turn the AI on or off per chat; mark read and unread; resolve hand-offs.
Fans and vault
  • Fans with segments (whales, lapsing, win-back and more), purchase history, notes, custom names and fan lists.
  • Vault media lists and thumbnails.
Stats and money
  • Today, revenue (by type, day and seller), audience, the cached overview report, and each creator’s transaction ledger.
The AI chatter
  • AI persona: read and update every field, with readiness.
  • AI content: folders, ladders, levels with floor prices, preview and paid media, ordering.
  • AI settings: follow-ups, review mode, and the OnlyFans welcome message with dry runs.
Tracking links
  • Clicks, subscribers, earnings, cost and ROI per link; record cost and source; create tracking and trial links.
MCP server
  • 60 tools and 6 prompts at https://mcp.onlyx.ai/mcp, with one-click setup for Claude, Cursor and VS Code, and guides for ChatGPT, Claude Code, Windsurf, Gemini CLI and Codex.
Platform
  • Consistent error envelope and codes, rate limits with X-RateLimit-* headers, cursor pagination, idempotent writes, and a public OpenAPI schema at https://api.onlyx.ai/v1/openapi.json.