Crypto · Signal-Driven#154

Spot-ETF Net-Flow Print Reaction

Spot crypto ETFs publish daily creation and redemption totals after the US close, and those flows are a clean read on institutional demand that shows up on a fixed schedule. Sustained inflows have historically preceded firmer prices over the following days, and a run of large outflows the opposite. You ingest each issuer's daily file the moment it posts and take positions in the multi-day and end-of-month crypto markets before the number gets absorbed into the narrative the next morning.

What you need to run it

Automated pull of per-issuer daily flow disclosures at their publication times
Rolling flow-vs-return study to size the tilt honestly rather than by feel
Awareness of month-end and quarter-end rebalancing distortions

Where this applies

Markets on Polymarket where spot-etf net-flow print reaction is the natural play:

Will Bitcoin close above $120,000 on September 30, 2026?
Will Ethereum be up this week?
Will Bitcoin end October 2026 higher than it started?

Capabilities this demands

Data ingestionPatienceCustom code / API

At a glance

CategorySignal-Driven

MarketCrypto

Requirements3

CapabilitiesData ingestion, Patience, Custom code / API

VenuePolymarket (CLOB, Polygon)

Build it

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This is documentation, not advice. Poly Research & Robotics publishes how these strategies work because the method should be checkable — not as a recommendation to trade them. See the full strategy database (297 strategies) or the data feeds directory.