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The Virtuals plugin connects Base MCP to the Virtuals Agent Commerce Protocol (ACP) MCP server. ACP is a platform for creating and operating autonomous AI agents that transact onchain, hold payment cards, and own email identities. Base MCP’s wallet is used only to sign the SIWE login challenge — every subsequent Virtuals tool call carries a session JWT. Server: https://mcp.acp.virtuals.io/ Operations: agent management (create / list / prepare-launch), agent cards (signup, issue, set limits, 3DS), agent email (identity, inbox, search, compose, reply, OTP/link extraction).

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Try it

Sign in
Log me into Virtuals
List agents
List all my Virtuals agents
Create everything
Create a Virtuals agent with email and a payment card

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Pattern

Virtuals is session-authenticated: every tool requires a token parameter obtained via SIWE. The plugin orchestrates the round trip — get_wallets → login_start → sign (Base MCP) → user approves → get_request_status → login_complete — then reuses the JWT for the rest of the session. Use login_refresh when the ~1 hour token expires.
The Base Account smart wallet sometimes returns an ERC-6492 wrapped signature instead of a plain ERC-1271 one, which Virtuals rejects with Invalid SIWE signature. Re-run the auth flow — repeated approvals typically resolve to a plain ERC-1271 signature within a few attempts. Don’t try to unwrap the envelope manually.
After auth, Virtuals operations route through the Virtuals backend (card issuance, email, agent ops) — not through Base MCP. Only the SIWE signature uses Base MCP. Don’t echo card numbers, 3DS codes, OTPs, or email bodies to chat unless the user explicitly asks.

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Installation

Run Base MCP and Virtuals side by side: 
{
  "mcpServers": {
    "base-mcp": { "url": "https://mcp.base.org" },
    "virtuals":     { "url": "https://mcp.acp.virtuals.io/" }
  }
}
Claude Code:
Terminal
claude mcp add virtuals --transport http https://mcp.acp.virtuals.io/

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Reference

Full plugin spec on GitHub

Step-by-step SIWE auth flow, troubleshooting for the six common signature-verification failure modes, and orchestration recipes for agent / card / email operations.