PostAgent MCP MCP server

PostAgent is an official MCP server by Interpret AI that enables AI agents to autonomously draft, print, and mail physical letters and postcards to US addresses. It handles address verification, pricing quotes, and payment processing via x402 USDC on Base or credit cards, providing tracking and delivery status updates.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by Interpret AI

MCP endpoint (Streamable HTTP)

https://api.postagent.sh/mcp

Vendor documentation

What you can do with it

Send personalized marketing letters to high-value leads
Mail physical return labels or onboarding packets
Dispatch formal legal notices or compliance documents
Generate and mail physical invoices to clients

Tools advertised by the last live check:

check_postagent_updates
create_letter
create_template
create_mail_quote
create_card_checkout
pay_mail_with_shared_payment_token
prepare_mail_payment
submit_paid_mail_job
get_mail_job_status
create_postcard_art
create_postcard_quote
verify_address
create_campaign_quote
get_campaign_status

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http postagent-mcp https://api.postagent.sh/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add postagent-mcp --url https://api.postagent.sh/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable postagent-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "postagent-mcp": {
      "url": "https://api.postagent.sh/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "postagent-mcp": {
      "type": "streamableHttp",
      "url": "https://api.postagent.sh/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start postagent-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "postagent-mcp": {
      "type": "http",
      "url": "https://api.postagent.sh/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http postagent-mcp https://api.postagent.sh/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "postagent-mcp": {
      "url": "https://api.postagent.sh/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "postagent-mcp": {
      "serverUrl": "https://api.postagent.sh/mcp"
    }
  }
}

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