Market-data selection
A useful tracker explains what its records represent, how they arrive and which labels are inferred. A dark-pool label does not by itself prove a specific ATS venue, an institutional buyer or a future price move. This comparison framework does not claim hands-on latency tests, a universal winner or verified trading performance.
Explore Market InsightsOff-exchange equity activity includes ATS and non-ATS trading. A Trade Reporting Facility is a reporting mechanism, not the execution venue. FINRA weekly transparency aggregates, individual transaction feeds and OHLCV-derived unusual-volume indicators answer different questions. Weekly aggregate volume cannot locate a particular fill on an intraday candle.
Use a defined ticker, session and sample. Check price, shares, execution time, sale conditions, cancellation status and correction handling against the provider’s documentation. Request the coverage universe and row limits. A vendor’s venue count is not a measure of completeness unless the classification and period are comparable.
Separate execution, report, provider receipt and screen display times. FINRA generally requires tape reports within 10 seconds during applicable facility hours, with other timing rules outside those hours. Retail delivery depends on the feed and service. This is different from FINRA’s delayed weekly aggregate releases; there is no universal 15–30-minute delay for all dark-pool products.
A buy/sell label can be inferred from price relative to quotes. It does not identify either counterparty or whether a position was opened, closed or hedged. A dollar-size badge is not proof of institutional ownership. Ask how stale quotes, midpoint prints, special prices and missing fields are handled.
Market Insights requests Unusual Whales recent or ticker-specific records and offers filters and a trade-detail view. Its side label compares price with the supplied NBBO midpoint. BLOCK and MEGA are premium/notional-size categories, not verified institution identifiers. The view refreshes while active; backend caching uses market-aware intervals. Full access requires Expert or above. No native TradingView print-feed overlay, guaranteed complete venue coverage or comparative speed advantage is established.
Use current official pages for Unusual Whales, FlowAlgo, TradeAlgo, Blackbox Stocks, Cheddar Flow and Market Chameleon. Verify the precise feed, historical access, export rights and plan required rather than using stale price ranges or assuming a missing feature. This directory does not certify their current latency, availability or quality. If you only need an aggregate study, a public FINRA dataset may answer a different and less time-sensitive question.
Save a rule before examining outcomes and use data available at the decision time. Include failed signals, missing records, fees and realistic fills. Combining an options trade with a stock print does not prove the same participant made both, and it does not automatically improve prediction accuracy.
Inspect available dark-pool records, filters and trade details under current account access.
Educational research, not investment advice or a performance certification.
