USDC supply rose $1.0B over the past 5 days, marking the third consecutive week of net inflows. Per BIS WP 1270 methodology, inflows of this magnitude are associated with 2.5-3.5 bps of yield compression in 3-month T-bills under normal supply conditions.

Current bill supply is adequate (Treasury announced $85B in 4-week bills this week), which limits the amplification effect. The signal reads mild tightening rather than the 5-8 bps compression seen during scarcity periods.

FRED 3-month yield at 3.61% is stable. The stablecoin inflow is consistent with GENIUS Act implementation preparation by issuers increasing T-bill reserve positions. Watch for acceleration as the January 2027 compliance deadline approaches.

Modest inflow of $280M over 5 days is below the 2-standard-deviation threshold identified by BIS WP 1270 as the trigger for statistically significant yield effects. Signal reads neutral — flow size is insufficient to generate a positioning signal.

The 2 bps drop in 3-month T-bill yield is attributable to macro factors (Fed communication dovish tilt at January meeting, market pricing 2 additional cuts) rather than stablecoin-driven supply/demand dynamics. No stablecoin-specific action indicated.

Significant inflow of $1.3B exceeds the 2-standard-deviation threshold, suggesting a measurable yield compression signal of approximately 3-4 bps over the next 5-10 trading days. This is the strongest reading since the signal pipeline went live.

Contributing factor: Circle announced a new institutional onboarding wave tied to GENIUS Act preparation, driving corporate treasury conversions to USDC. The inflow is structural (reserve-building) rather than speculative, which historically produces more persistent yield effects per the BIS asymmetry finding.

Bill supply context: Treasury is running elevated auction sizes ($90B in 4-week bills), partially offsetting stablecoin demand pressure. Net effect: moderate tightening signal. Duration positioning implication: favor the short end of the 1-6 month curve this week.