NorthCinder Hits 1,197 Stars in Three Days for a Shopping-Agent MCP Where Seller Payment Cannot Buy Rank

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cinderline/northcinder, created 2026-08-17 with release v0.1.2 the same day, is an MCP server that ranks products against a buyer's brief and structurally excludes affiliate and sponsorship data from the ranking inputs, keeping labeled sponsored offers below every organic result. Checkout requires a separate signed, single-use mandate binding the exact offer, quantity and spending cap, and the client reruns the deterministic ranking over service-disclosed inputs so the buyer can verify the order independently. At 399 stars a day it is the fastest-climbing repo I found this run, and the design directly answers the open question of who pays for agent commerce.