{"id":3387,"date":"2021-10-03T15:23:55","date_gmt":"2021-10-03T13:23:55","guid":{"rendered":"https:\/\/eodhd.com\/financial-apis\/?p=3387"},"modified":"2026-08-26T15:51:31","modified_gmt":"2026-08-26T13:51:31","slug":"new-real-time-data-api-websockets","status":"publish","type":"post","link":"https:\/\/eodhd.com\/financial-apis\/new-real-time-data-api-websockets","title":{"rendered":"Real-Time Data API via Websockets"},"content":{"rendered":"\n

EODHD offers one of the best ways for investors, developers, and data analysts to incorporate real-time finance data for the stocks, 1100+ Forex pairs, 1000+ Digital Currencies into their decision-making projects with a delay of less than 50ms<\/strong> via WebSockets. For stocks our real-time data API supports pre-market and post-market hours<\/strong> (from 4 am to 8 pm ET; the session is computed in the America\/New_York timezone, so those clock times hold all year regardless of daylight saving).<\/p>\n\n\n

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The subscription provides real-time access to prices for 50 tickers simultaneously<\/strong> via WebSockets. Additionally, the 50-symbol limit can be increased through the user dashboard<\/a>.<\/p>\n\n<\/div>\n <\/div>\n \n\n\n

For global markets and all exchanges around the world we also offer Live (Delayed) data<\/a> with 15min delay.<\/p>\n\n\n\n

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What is WebSocket protocol<\/h2>\n\n\n\n

WebSockets is a communication protocol that provides full-duplex communication channels over a single TCP connection. It enables real-time communication between a client and a server, allowing them to exchange messages continuously without the overhead of repeatedly establishing new connections. In the case of financial data providers, Websockets API provides real-time stock market information with minimal delay. <\/p>\n\n\n\n

Because real-time WebSocket streaming is resource-intensive, it is offered on paid plans rather than a free tier.<\/p>\n\n\n\n

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What you get (Data availability)<\/h2>\n\n\n\n

Stocks<\/strong> (full list of tickers available<\/a>)
\u2022\u00a0Trade<\/em>\u00a0stream (last price, size, conditions, etc.)
\u2022\u00a0Quote<\/em>\u00a0stream (bid\/ask, sizes)
\u2022\u00a0Extended hours supported\u00a0(pre\u2011 and post\u2011market)<\/p>\n\n\n\n

FOREX<\/strong> (full list of available currency pairs)<\/a>
\u2022 Bid\/ask + day change\/difference
\u2022 Tickers like EURUSD, AUDUSD, etc.<\/p>\n\n\n\n

Digital Currencies <\/strong>(Full list of available crypto pairs<\/a>)
\u2022 Last price, quantity, day change\/difference
\u2022 Tickers like ETH-USD, BTC-USD

Lists of available tickers and pairs for Real-Time feeds can be retrieved in JSON format via this API endpoint<\/a>, providing the full list of exchange or asset class components (use “US” for US stocks, “CC” for cryptocurrencies, “FOREX” for currency pairs).<\/p>\n\n\n\n

Demo access is available with API key “demo” for: AAPL, MSFT, TSLA, EURUSD, ETH-USD, BTC-USD.<\/em><\/p>\n\n\n\n

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Data source and what the data represents<\/h2>\n\n\n\n

Real-time US and European equities are delivered directly from Cboe Global Cloud<\/strong>, our official exchange data source. Because this is a direct-from-exchange feed rather than an aggregated one, it is worth being precise about what it contains.<\/p>\n\n\n\n

US equities<\/h3>\n\n\n\n

US trades and quotes come from Cboe EDGX<\/strong>, one of Cboe’s four US equity exchanges. Trades are executions that occurred on EDGX \u2014 this is not a consolidated (SIP) tape, so it does not include executions from other exchanges, or off-exchange and FINRA TRF prints. Quotes are the EDGX top of book with sizes, not a national best bid and offer aggregated across venues. Pre-market and post-market trades are delivered and flagged through the market status field.<\/p>\n\n\n\n

On a normal trading session the US stream carries about 12,700 symbols<\/strong>. Measured over a longer window the count is slightly higher \u2014 around 13,100 across 21 trading days \u2014 because a symbol that does not print on a given day is simply absent from that day’s stream.<\/p>\n\n\n\n

European equities<\/h3>\n\n\n\n

European trades and quotes come from Cboe Europe<\/strong>, across its BXE, CXE and DXE order books, covering UK-listed names and continental large-caps over a single endpoint. Trading hours follow each instrument’s home venue, so the last trade for a symbol may lag once that venue enters its closing auction while quotes continue elsewhere.<\/p>\n\n\n\n

Coverage spans 18 European markets<\/strong> and about 9,400 symbols<\/strong> on a normal session \u2014 London, XETRA, the Euronext venues, the Nordic exchanges, Madrid, Milan, Vienna and Warsaw among them. As with the US stream, a longer window gives a slightly higher count.<\/p>\n\n\n\n

European quotes differ from the US ones in one important way: they are a consolidated best bid and offer across all three books<\/strong>. The best price wins, and where two books show the same price their sizes are added, so the size you see is the depth available at that price across the venues we carry.<\/p>\n\n\n\n

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Updates & Latency<\/h2>\n\n\n\n