Glossary

Term	Meaning
MCP	Model Context Protocol — the JSON-RPC 2.0 over Streamable-HTTP transport that Claude, ChatGPT, and Cursor use to call your tools.
Tool	A named function the MCP server exposes. Oasy ships four by default: `search_articles`, `get_article`, `list_recent`, `list_by_topic`.
Install	One instance of an MCP client connected to your server. With OAuth on, each install has a stable `client_id`; without, we identify by MCP session id.
Policy	Per-article setting that controls what an agent can do: `Observe` (full text), `Advertise` (text + sponsored line), `Paywall` (metered), `Block` (403).
Meter	A counter of `Paywall`-policy article views per install per window (day / week / month). When the count exceeds the free quota, we return an upsell payload instead of the body.
Vanity host	`oasy.<your-domain>` — the CNAME-pointed subdomain that serves both your MCP endpoint and your AI-traffic landing pages.
WAF redirect	The custom firewall rule on your CDN that sends AI crawler UAs to your vanity host instead of letting them scrape your canonical pages.
x402 / MPP	HTTP 402 Payment Required with Stripe's Machine Payments Protocol — how PAYWALL articles get paid for on the WAF redirect path when the agent can't OAuth.
Subscriber link	Mapping an OAuth install to a paying subscriber so they bypass the meter. Two transports: Flip-Pay cookie or HMAC webhook.