@codespar/mcp-ap2

MCP server for AP2 — Google's Agent-to-Agent Payment Protocol (authorization, audit, and trust for agentic payments)

What is AP2?

AP2 (Agent-to-Agent Payment Protocol) is Google's open framework for authorization, audit, and trust in agentic payments. It answers the critical questions: Who authorized this payment? What limits apply? What's the full audit trail?

With 60+ partners including Visa, Mastercard, Stripe, PayPal, and Square, AP2 is the emerging standard for agent payment governance.

Quick Start

Claude Desktop

Add to ~/.config/claude/claude_desktop_config.json:

{
  "mcpServers": {
    "ap2": {
      "command": "npx",
      "args": ["-y", "@codespar/mcp-ap2"],
      "env": {
        "AP2_API_KEY": "your-key",
        "AP2_AGENT_ID": "your-agent-id"
      }
    }
  }
}

Claude Code

claude mcp add ap2 -- npx @codespar/mcp-ap2

Cursor / VS Code

Add to .cursor/mcp.json or .vscode/mcp.json:

{
  "servers": {
    "ap2": {
      "command": "npx",
      "args": ["-y", "@codespar/mcp-ap2"],
      "env": {
        "AP2_API_KEY": "your-key",
        "AP2_AGENT_ID": "your-agent-id"
      }
    }
  }
}

Tools

| Tool | Description | |------|-------------| | register_agent | Register an AI agent as a trusted payer in AP2 | | get_agent | Get agent registration details and trust status | | list_agents | List registered agents with filters | | revoke_agent | Revoke an agent's payment authorization | | authorize_payment | Request payment authorization with scoped limits | | get_authorization | Get authorization details by ID | | list_authorizations | List payment authorizations with filters | | execute_payment | Execute an authorized payment | | get_audit_trail | Get full audit trail for a transaction | | list_audit_events | List audit events with filters | | list_payment_methods | List available payment methods via AP2 partners | | get_transaction | Get full transaction details | | list_transactions | List transactions with filters |

Authentication

AP2 uses a Bearer API key and requires a registered Agent ID.

Get your credentials

1. Visit the AP2 Developer Portal
2. Register your application
3. Generate an API key
4. Register your agent to get an Agent ID
5. Set the environment variables

Sandbox / Testing

AP2 provides a sandbox environment for testing. Set AP2_SANDBOX=true to use it.

Environment Variables

| Variable | Required | Description | |----------|----------|-------------| | AP2_API_KEY | Yes | API key from AP2 | | AP2_AGENT_ID | Yes | Registered agent ID | | AP2_SANDBOX | No | Set to true for sandbox mode |

Use Cases

• Authorized agent purchases — Agent requests spend authorization, gets approval with limits, then executes payment
• Multi-agent commerce — Agent A authorizes Agent B to make payments on its behalf with scoped limits
• Compliance & audit — Full audit trail of every authorization, approval, execution, and settlement
• Cross-rail payments — AP2 bridges card payments, bank transfers, wallets, and x402 micropayments

Roadmap

v0.2 (planned)

• create_policy — Define reusable authorization policies
• delegate_authority — Allow agent-to-agent authorization delegation
• get_spend_report — Get spend analytics and reports
• OAuth 2.0 authentication flow

v0.3 (planned)

• Webhook support for real-time authorization events
• Multi-currency support with automatic FX
• Integration with x402 as payment method

Want to contribute? Open a PR or request a tool.

Links

• AP2 (Google)
• AP2 Specification
• MCP Dev Brasil
• Landing Page

License

MIT