Xcel Mail API

Order automotive direct mail (postcards and letters) for a dealer through one backend: a REST API under /v1, a remote MCP server at /api/mcp, and Xcel's ops team behind them.

• OpenAPI 3.1 spec
• llms.txt: how an agent goes from a sandbox key to a simulated submission

Phase 1 pilot: submitted live orders are produced by Xcel staff. Prices are placeholders.