Quick start paths
These English quick starts now cover the first runnable Caller and Responder loops with real commands, result shapes, and the minimum contract fields you need to inspect.
Protocol docs
The protocol section defines how identity, routing, settlement, and result packaging stay stable across many operator-owned capabilities, including the control-plane and data-plane split.
Platform and marketplace
Marketplace is the public discovery surface. Platform is the control and routing layer that lets teams run the same protocol in hosted or self-hosted form.
Why Hotline exists
The compare pages explain why the project is not reducible to MCP, Skills, SaaS, or raw APIs. They are the fastest route to the product model.
Evidence pages
These case studies are intentionally non-fictional. They document the real caller-side and responder-side proof paths the current public stack can demonstrate without inventing customer logos or fake metrics.