WebSocket fan-out with Redis pub/sub: one market data connection for every service
Share one market data WebSocket across services: read max_conn and max_subs from the ack, republish ticks on Redis, snapshot for late joiners. Python code.
Tag · rate-limits
rate-limits
12 posts on rate-limits from the SiftingIO market data blog, spanning real-time and historical coverage across stocks, forex, crypto, commodities, and on-chain venues.
Posts tagged rate-limits
Market data API request calculator: estimate calls before choosing a plan
Estimate market data API calls from symbols, polling intervals, shared workers and backfill. Includes worked examples and a tested Python calculator.
R market data API: OHLCV to xts with httr2
Replace the quantmod getSymbols loading step with an R market data API: fetch US stock OHLCV bars with httr2, paginate by cursor and build an xts object.
Market data API rate limits: handle HTTP 429 without a retry storm
Tell a burst 429 (rate_limit_exceeded) from a spent monthly quota (monthly_quota_exceeded), retry safely with jitter, and cut the polling that causes it.
Cursor pagination for market data APIs: pull years of 1-minute OHLCV bars without gaps
How cursor pagination works on a market data API, with request math, a Python loop, and a gap check for multi-year pulls of 1-minute OHLCV bars.
How market data API pricing works: a buyer's guide for developers
Market data API pricing explained: per-market tiers, call quotas vs rate limits, WebSocket limits, history depth, overage, free tiers, and redistribution rights.
How to Evaluate a Market Data API Before Going to Production
A vendor-neutral checklist for evaluating a market data API: price accuracy, latency percentiles, WebSocket stability, gaps, rate limits, and licensing.
Market hours API: check whether a market is open before your code polls it
Use a market hours API to check open status, holiday calendars, and half days across 23 markets so your polling code stops serving stale prices.
Aligning economic calendar events with your backtest's bar timeline
How to pull scheduled US economic events from one endpoint and align them with OHLCV bars so a backtest knows when CPI, NFP, and FOMC actually hit.
Economic calendar webhook alerts: get CPI and jobs report releases pushed to your app
Get CPI and jobs report releases pushed to any webhook: a Node.js poller on SiftingIO's economic calendar API, with plan limit math and common pitfalls.
Aligning economic calendar events with your backtest's bar timeline
How to pull scheduled US economic events from one endpoint and align them with OHLCV bars so a backtest knows when CPI, NFP, and FOMC actually hit.
Real-time FX and crypto quotes: REST snapshots and WebSocket streams
How to read real-time FX and crypto quotes from SiftingIO: REST bid/ask snapshots for EURUSD and BTCUSD, WebSocket tick streams, and the pitfalls in between.