Seiche — world-markets evidence terminal MCP server

SEICHE

A seiche is a standing wave in an enclosed body of water — invisible from the

shore, until it sloshes over the edge. Funding stress behaves the same way.

Seiche is a free, open source (AGPL-3.0-or-later) money-, foreign-exchange and capital-market evidence terminal organized around the dollar funding system — US money markets, 22 public H.10 currency reference series, the Treasury capital-market complex, the global basins connected through swap lines, and the offshore-dollar crypto basin moored to the T-bill market through stablecoins. The core US board and USD desk use free official/public APIs (FRED, NY Fed Markets, OFR STFM, Treasury FiscalData, CFTC, ECB Data Portal, DeFiLlama, Coinbase Exchange). The global market-pack catalog can also declare licensed or tenant sources, but public outputs obey each source's redistribution policy and never expose restricted raw values.

Seiche publishes a construction-PIT historical diagnostic—with misses and eligibility limits kept visible—and is now accruing a separate as-published forward record that can be verified instead of reconstructed. Licensed terminals provide much broader real-time data and execution workflows, while OFR and NY Fed dashboards provide authoritative source views. Seiche is a narrower, opinionated research layer: forward-looking, alerting-ready, and provenance-honest. It is not a Bloomberg/Reuters replacement, a real-time quote service, or an execution venue.

The lab

Seiche is one of three altitudes in a single liquidity lab that fills that gap: Seiche reads the plumbing, LiquiLens ranks the institutions standing on it, and Undertow prices market liquidity itself (who provides depth in each segment, what an exit at position size costs today). The wiring between the three is real, not a brochure: the desk assistant pulls the LiquiLens failure board over MCP, the MARKET tab renders Undertow's published pack live, and the Windfetch engine reads the FETCH pack built in the Undertow repo back into this board. On names: the internal composite engine called "undertow" (critical slowing down, engines/undertow.py) is unrelated to the Undertow sister product.

Use Seiche everywhere

Seiche is distributed as software, an MCP service, a research dataset, and machine-readable catalog metadata. Status is receipt-based: listed means a durable public record and receipt exist, prepared means an owner-controlled submission or publication remains, and blocked means a named prerequisite must clear first. “Usable in repo” describes local artifact readiness, not a ledger status. The auditable source of truth is distribution/submissions.csv.

Shortened. The full README is on GitHub.