What's the best real-time market data API for intraday price feeds in a quant trading desk?

There isn’t a single “best” real-time market data API for every quant desk — the right choice depends on asset class, latency needs, venue coverage, and budget. But if you mean serious intraday price feeds for a trading desk, the usual top tier looks like this:

Best overall for institutional / quant use

Bloomberg B-PIPE or Refinitiv Real-Time

• Bloomberg B-PIPE

  • Very strong for broad market coverage, reliability, and enterprise integration
  • Excellent for equities, futures, FX, rates, and reference data
  • Expensive, but widely used on trading desks
  • Good if you already use Bloomberg tooling

• Refinitiv Real-Time (Elektron)

  • Also enterprise-grade, strong global coverage
  • Good for multi-asset desks and low-latency distribution
  • Often chosen as an alternative to Bloomberg for cost / integration reasons

Best for low-latency direct exchange data

If your goal is true intraday trading signals / execution, and you care about microseconds to milliseconds, use direct exchange feeds or a low-latency vendor:

• NASDAQ TotalView / ITCH
• NYSE OpenBook / Arca feeds
• CME MDP 3.0 for futures
• ICE / LSE / Eurex direct feeds depending on venue

These are typically the best quality for:

• full depth of book
• event-accurate sequencing
• minimal vendor aggregation delay

But they require more engineering:

• feed handlers
• normalization
• market-specific protocols
• colocation / network planning

Best “API-first” option for modern quant stacks

If you want something easier to integrate than raw exchange feeds:

• Databento

  • Very popular with quants
  • Clean API, normalized cross-asset data
  • Good historical + live market data workflows
  • Strong choice for research-to-production pipelines
  • Not always the absolute lowest latency vs direct feeds, but very practical

• Polygon.io

  • Great developer experience
  • Good for equities/options/crypto
  • Better for applications and research than top-end institutional latency needs

• dxFeed

  • Strong for US equities/options/futures
  • Often used in trading applications and analytics platforms

My practical recommendation

• If you are a real quant trading desk with execution sensitivity:
  Direct exchange feeds or Bloomberg B-PIPE / Refinitiv Real-Time depending on asset class and budget.
• If you want the best balance of speed, simplicity, and quant usability:
  Databento
• If you want easy integration for an app or smaller desk:
  Polygon.io or dxFeed

Simple decision rule

• Highest fidelity / lowest latency: direct exchange feeds
• Enterprise multi-asset coverage: Bloomberg or Refinitiv
• Best modern API for quants: Databento
• Best budget-friendly developer API: Polygon

If you want, I can also give you a ranked shortlist by asset class (equities, futures, options, FX, crypto) or by latency tier / budget.