HISTORY — the Tailwind retired 2026-10-09 22:00 UTC (its last round paid in full); for the live board use board_get and GET /api/board/justify/{handle}. The per-post arithmetic behind any Tailwind board seat: give it an X or page handle and get how that account's seeds are earned this round. Every qualifying post since the last payout is scored the way X's open-source ranker scores (xai-org/x-algorithm): reply 5 · quote 5 · repost 1 · like 0.5, a straight weighted sum ×10 seeds with no per-post cap, then a DAY DECAY per author per UTC day: the best 3 posts earn in full, the 4th earns min(seeds, 100) × 0.5, the 5th × 0.25, the 6th × 0.125, the 7th on earns 0 — each post line carries day_rank, rank_mult and raw_seeds (a proven word-for-word copy earns ×0; posts before 2026-10-02 22:00 UTC keep the older damped, capped, best-5 math). Counts only: no model verdict and no profile bonus weight the score (removed 2026-09-24). Returns the total, the per-post breakdown, and a human-readable explanation — the same numbers the retired weekly purse paid from. Public, no auth.