Market Data Glossary
Understand ticks, candles, Level 2 and rate limits before you integrate a market data API.
All terms
9 terms
What Is Tick Data
A tick is the smallest granularity of market activity. HFT and microstructure research depend on tick streams rather than candles alone.
Read moreOHLCV Candlestick Fields
Knowing OHLCV semantics is required for corporate actions, indicators and cross-vendor alignment.
Read moreWebSocket vs REST Polling
Channel choice affects latency, bandwidth and complexity — not just subscription price.
Read moreHow to Measure API Latency
Latency is path-dependent. Build repeatable benchmarks from your production region.
Read moreLevel 1 vs Level 2 Quotes
Dashboards usually need Level 1. Market making and impact analysis need depth.
Read moreAPI Rate Limits & Errors
Auth and quota handling must be rock solid — especially on volatile tape days.
Read moreStock Split & Adjustment
Backtests must declare whether candles are adjusted; otherwise return curves lie.
Read moreAPI Pagination & Bulk Fetch
History backfills must be fast without tripping rate limits — pagination and concurrency matter.
Read moreWebSocket Heartbeat
Without heartbeats, long-lived sockets die silently until the next send fails.
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