TL;DR
PostOnce is a Communication MCP server that lets Claude Code, Cursor, Windsurf and any MCP-compatible AI agent hosted MCP server (Streamable HTTP) at https://postonce. Install in 1 minute with mcpizy install postonce.
PostOnce
Communication
Hosted MCP server (Streamable HTTP) at https://postonce.to/mcp, authenticated with a PostOnce API key as a Bearer token. Lets AI agents list connected social accounts, publish posts and set up automatic crossposting to TikTok, Instagram, YouTube Shorts, Facebook, LinkedIn, X, Threads, Bluesky and Pinterest. Setup: https://postonce.to/integrations/mcp. Registry: io.github.postoncehq/postonce.
Install PostOnce
mcpizy install postonceWe could not verify a published package or a reachable endpoint for this server, so we are not showing an install command that would fail. Checked 2026-08-11. Follow the repository's own instructions instead.
Works with
More Communication MCPs
Alternatives to PostOnce
If PostOnce doesn't fit your stack, these Communication MCP servers solve similar problems.
Frequently asked questions
What is the PostOnce MCP server?
PostOnce is listed as an Communication Model Context Protocol server whose documented purpose is to let an MCP-compatible agent hosted MCP server (Streamable HTTP) at https://postonce. Client support, permissions and authentication remain specific to the upstream project.
How do I install PostOnce MCP with Claude Code?
The fastest way is the MCPizy CLI: run `mcpizy install postonce` and MCPizy will add the server to your `.claude.json` automatically. You can also install it manually by adding an entry under `mcpServers` in `.claude.json` with the command `null` and restarting Claude Code.
Does MCPizy charge to view or install PostOnce MCP?
No. Reading this profile and copying its install guidance is free. Upstream software, API, account or usage costs are separate, and licence coverage should be checked from the linked source when available.
Does PostOnce MCP work with Cursor and Windsurf?
The MCP standard is supported by those clients, but a specific server can still have client-specific setup or transport limits. Use the configuration shown on this page when present and verify the upstream instructions before installation.
What can I do with PostOnce MCP?
Its documented purpose is to let an MCP-compatible agent hosted MCP server (Streamable HTTP) at https://postonce. The exact tools, permissions and write capabilities depend on the server version and configuration shown by the upstream project.
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