# Tidemark

> Tidemark tracks the quarterly 13F filings of a curated roster of institutional
> managers and turns them into behavior: one of six Primary Signals per stock, an
> estimated (weighted-average-cost) cost basis per holder on Pro, and watchlist events
> on stocks a user follows (13F/A corrections for everyone, the daily price-vs-cost
> stream on Pro). Delayed 13F data, filed quarterly and up to 45 days after the
> quarter it describes.

Tidemark exposes this as an MCP server (`https://tidemark-ohc1.onrender.com/mcp`,
JSON-RPC 2.0, authenticated with OAuth or an `X-API-Key` header) offering five tools:
`get_stock_signal`, `screen`, `get_watchlist_events`, `get_manager`, `list_managers`.

## Docs

- [Agent skill](/skill.md): full tool contracts, request/response examples, the
  signal vocabulary, rate limits and tier behavior — read this before connecting.
- [Methodology](/#methodology): how filings become signals and estimated cost basis.