What a spot trade represents
In a spot market, quote asset is exchanged for the base asset at the executed price. On BTCUSDT, the trade updates spot holdings between participants. Taker direction describes which resting side was consumed.
Spot still includes market makers, algorithms, and inventory management; it should not be simplified into long-term investors versus sellers.
What changes in futures
A futures or perpetual trade transfers contract exposure rather than spot Bitcoin. Positions may be leveraged and subject to margin, funding payments, expiry, basis, and liquidation rules. A buy can open a long or close a short; public trade direction alone does not reveal the participant's full position intent.
Forced liquidation can create aggressive flow that is specific to derivatives. Open interest and funding provide additional context not present in a basic spot order book.
Why pressure can disagree
Different participants, collateral, risk limits, and market events can concentrate activity in one venue. Basis traders can buy spot and sell futures simultaneously. Arbitrage usually limits large persistent price gaps, but short-term flow can remain different.
A tool that mixes spot and futures should label and normalize each source carefully. Market Tug currently does not mix them: its production index is Binance Spot BTCUSDT only.
Why Market Tug starts with spot
Using one clearly named spot pair makes the scope understandable and keeps the initial model reproducible. It avoids implying that derivative leverage or liquidations are included when they are not.
Future research may compare venues only after provider rights, data quality, model design, and calibration are explicitly reviewed and versioned.