x402 Index Listings Appear to Lapse Around Four Weeks After Last Payment

A measurement of Coinbase's x402 discovery index found that the number of one seller's listed endpoints fell from 153 to 56 between early October and early November 2026, though the endpoints themselves were unchanged and still payable. Joining listed and delisted service IDs to their most recent settlements showed a sharp split: every ID with a payment younger than 26.5 days was still listed, while every ID with a payment older than 30.3 days had been removed. The author stresses this reflects the index's current membership as of 2026-11-07, not a fixed rule, and that the index is curated editorially rather than governed by a published policy. Sellers were advised to check the age of their newest payments per listing, since a listing is not a durable asset and can lapse without any change on their side. The author also flagged stale descriptions and duplicate alias rows as issues sellers may need to watch for.