SEICHEdispatches · live board
2026-07-12 · EROSION · the daily letter

Erosion with a loud tell: plumbing leads price at +37

The composite reads 45, regime EROSION. The Tell reads +37. Every number below is checkable on the board.

The composite reads 45 out of 100, EROSION, on 100% coverage. Nothing is breaking. The margin for error is what is shrinking.

The heaviest hand on the dial is weather at a score of 84, worth +9.2 points of the total. That is where the reading comes from. The rest is arithmetic.

The Tell, the gap between what the pipes measure and what the screens price, reads +37: plumbing indicators at the 57th percentile of their own history, market indicators at the 20th.

A gap this wide has a short shelf life. The board's read is plumbing leads price, and the record of what happened after past gaps sits in PROOF.

Overnight, the tape did move: MMF repo with FICC (sponsored) printed 1,168.72 $B (level z +6.7, change z -0.1, as of 2026-05-31); Central bank liquidity swaps outstanding (H.4.1) printed 170.00 $M (level z -0.2, change z -5.3, as of 2026-07-08); Discount window primary credit (Wed level) printed 5,771.00 $M (level z +1.1, change z -4.4, as of 2026-07-08).

The dates that matter

The next date that matters is 2026-07-16: $266B auction settlement while reserves sit below the estimated kink, worst case $3,070B. The turn model puts 2026-07-31 (month_end) at +3.0bp with a band of [-0.9, +7.8], severity 2/5. FOMC decides 2026-07-29, 17 days out. The corporate tax date lands 2026-09-15, 65 days out; tax dates drain reserves on a schedule everyone can read.

What the board is honest about

All sources and engines report live. The misses this board has made sit in PROOF next to the hits; read those before weighting today's letter.

The desk's forward read

Bathymetry puts the odds of an event inside five business days at 3%, mean first-passage roughly 79 business days. The learned model reads 0% for the same window and calls it does not out-rank the rule-based index. The regime chain gives 0% odds of touching STRESS inside 21 business days, with an expected dwell of 61 business days in the current state. Resonance reads 71: the Year-end (G-SIB surcharge snapshot) mode is amplifying at 6.3x, which is the basin ringing louder to the same calendar.

Positioning

The most crowded seat is SOFR-3M, leveraged net -0.22 of open interest (z -2.5). Dealer warehouse holds $428B, the 96th percentile of its history, 40% of it long end. Positioning data is COT and carries its native T+3 lag; the lag is shown, never hidden.

Echoes

episodewindowsimilarity
Mar 2020 dash-for-cashT−23d0.66
Apr 2025 tariff shock basis unwindT−24d0.58
Sep 2025 tax-date squeeze (SOFR +18bp over EFFR)T−16d0.56
Sep 2019 repo spike (SOFR 5.25%, GC 10%)T−2d0.55

Similarity is not destiny. The echo table says this rhymes, and PROOF says how often rhymes mattered.

What would change the desk's mind

The tell closing back under +15, reserves stabilising for two weeks, or the resonance amplification easing below 1x. When one of those prints, the letter will say so, in this same place, with the number.

The board recomputes six times a day; this letter freezes one reading of it. Free public data with native lags. Not investment advice.

Written by the terminal from the live board, no model in the loop; every number is checkable on the free board. Seiche is free open source software (AGPL-3.0, source). Plain English guide · Support · Not investment advice.