Duffel Flights gateway (reference implementation)
A travel-booking MCP server enforcing MAGP trustlessly end to end: completes the mutual DID handshake, independently re-verifies each agent's signed request against its issuer-hosted policy bundle, and binds settlement to a single, amount-exact authorization via x402 before it ever calls the airline. Source: demo/duffel-mcp-gateway in the AgentSafe repo.
