Alpaca: API-first US broker-dealer offering commission-free stock, options and crypto trading APIs, plus a white-label Broker API for fintechs.
Alpha Vantage: NASDAQ Vendor List-licensed REST API provider streaming realtime and historical stock, forex, crypto and fundamentals data to developers.
Amberdata: Institutional digital-asset market, on-chain, and derivatives data provider whose GVOL platform covers 1,000+ crypto exchanges.
Barchart: Chicago-based provider of market data APIs and commodity trading tools spanning equities, futures, forex, crypto, agriculture, and energy.
Benzinga: Detroit financial media firm behind Benzinga Pro's real-time trader newsfeed and a B2B news and market-data API suite for brokerages.
Bloomberg (B-PIPE / Data License): Enterprise market data via a consolidated real-time feed (B-PIPE) and bulk/reference data delivery (Data License).
BMLL Technologies: Cleans and harmonises full order-book history from 120+ exchanges into one format for equities, ETFs, futures and options research.
CoinAPI: Normalises trade, quote and order-book data from 400+ crypto exchanges into one REST, WebSocket, FIX and flat-file API.
CoinDesk Data: FCA regulated digital asset data and index provider aggregating 300+ exchanges, 10,000+ coins and 300,000 pairs via one API.
CoinGecko: Independent crypto data aggregator tracking price and volume across 18,000+ coins on 1,500+ exchanges, plus on-chain data via GeckoTerminal.
CoinMarketCap: Aggregates crypto prices, trading volume and market-cap data from hundreds of exchanges, sold via a tiered REST API for developers.
Coin Metrics: Institutional crypto data provider: on-chain metrics, market data, and reference pricing for 1,500+ digital assets; now operated by Talos.
CQG: Denver based provider of futures and options trading, execution and market data technology, acquired by Broadridge in 2026.
CryptoQuant: On-chain data platform tracking exchange flows, miner reserves and derivatives activity across Bitcoin, Ethereum and other crypto assets.
Currencylayer: JSON API delivering real-time and historical exchange rates for 168 currencies plus gold and silver, back to 1999.
Databento: Sells real-time and historical market data via a pay-per-byte API, captured directly from exchange colocation across 200+ venues.
Dataminr: AI platform that scans over a million public sources in real time to alert clients to breaking events, threats and cyber risk before mainstream coverage.
DefiLlama: Open-source aggregator of DeFi TVL, fees, revenue and yields across 500+ chains, funded without VC money or a token.
Dow Jones Newswires: The real-time financial newswire of Dow Jones and Company, providing machine-readable news feeds for algorithmic trading desks.
DTN IQFeed: Direct-from-exchange tick, Level 2 and historical data delivered via a socket and COM API for third-party trading and charting software.
Dukascopy: Swiss FINMA-regulated bank and ECN broker running the SWFX marketplace, known for its free tick-by-tick historical data export.
Dune Analytics: Indexes on-chain data from 100+ blockchains into SQL-queryable tables, powering community dashboards and enterprise data feeds.
dxFeed: Munich-based market data vendor and Devexperts subsidiary streaming real-time and historical multi-asset tick data via cloud APIs.
EODHD (EOD Historical Data): Bootstrapped French provider of REST/websocket APIs for stocks, ETFs, forex, crypto and US options data across 60-plus exchanges.
Estimize: Crowdsourced consensus of EPS, revenue and macro estimates from 120,000+ contributors, run by ExtractAlpha since 2021.
ExchangeRate-API: A REST/JSON API delivering fiat currency conversion rates for 161 to 165 currencies, sourced from central banks and commercial feeds.
Exegy (incl. Vela): FPGA-accelerated ticker plants, consolidated market data, and low-latency execution for institutional trading firms.
FactSet: Financial data and analytics company supplying the FactSet Workstation, APIs and data feeds to portfolio managers, analysts and bankers.
Financial Modeling Prep: Developer-focused API delivering SEC-sourced financial statements, fundamentals and real-time market data across 70,000+ securities.
Finnhub: Developer REST/WebSocket API for real-time stock, forex, and crypto data, company fundamentals, and alternative datasets.
Fixer: REST JSON API delivering real time and historical foreign exchange rates for 170 currencies, aggregated from the ECB and 15+ other sources.
FRED (Federal Reserve Economic Data): Free, federally run database of over 800,000 US and global economic time series, with charting tools, a REST API, and mobile apps.
FXCM (Pro / ForexConnect): FX/CFD broker whose Pro division supplies institutional liquidity, prime brokerage, and free FIX/ForexConnect trading APIs.
Glassnode: Swiss on-chain and market-data provider offering 1,700+ metrics across 1,500+ digital assets via its Glassnode Studio platform and API.
HistData: Free downloadable tick and 1-minute FX, commodity and index history for platforms like MetaTrader; EUR/USD data runs back to 2000.
ICE Data Services: ICE's market-data arm: evaluated pricing, reference data and consolidated feeds for fixed income, derivatives and multi-asset instruments.
IEX Cloud: US equities, options and reference-data API launched by IEX Group in 2019 and retired in August 2024; assets relaunched as Blue Sky Data.
Intrinio: US financial data API provider that resells the consolidated SIP tape and IEX real-time feeds for equities, options and fundamentals.
ISS ESG: ISS ESG researches, rates and screens companies, sovereigns and funds on ESG and climate factors for institutional investors.
Kaiko: Aggregates trade, order-book, and derivatives data from 100+ crypto exchanges into institutional-grade feeds, indices, and risk analytics.
LunarCrush: Converts X, Reddit, YouTube and TikTok activity into Galaxy Score and AltRank sentiment metrics for crypto and stocks.
Marketstack: JSON REST API for real-time, intraday and historical stock price data across 70+ exchanges, sold on metered API-call tiers.
MarketWatch: Dow Jones-owned financial news site combining free market quotes and screeners with paywalled journalism and a virtual-trading simulator.
Massive (formerly Polygon.io): Developer-focused market data APIs and flat files for US stocks, options, forex, crypto and futures; formerly Polygon.io, renamed 2025.
Messari: Crypto data and research platform covering 40,000+ digital assets, acquired by Blockworks in June 2026.
Morningstar Sustainalytics: Independent ESG research and ratings provider, wholly owned by Morningstar since 2020, known for its ESG Risk Ratings on 16,000+ companies.
MSCI ESG: Rates 17,000+ companies AAA to CCC on industry-relative, financially material ESG risk using a rules-based methodology.
Nansen: Blockchain analytics platform that labels 500M+ wallet addresses to track smart money and power integrated onchain trading.
Nasdaq (TotalView / Basic / Data Link): Nasdaq's own commercial market-data arm, selling exchange-generated US equity depth-of-book, top-of-book and cloud-delivered datasets.
Norgate Data: Sells survivorship-bias-free EOD price data with delisted stocks and index-membership history for US, AU and Canadian equities and futures.
OANDA Exchange Rates API: A paid FX data API from OANDA delivering historical, real-time and forward currency rates across 38,000+ pairs, sold separately from its retail trading platform.
Open Exchange Rates: Blends live and historical exchange rates for 200+ world and digital currencies from multiple providers into a simple JSON/REST API.
Options Technology (ACTIV Financial): UK capital markets technology firm supplying managed trading infrastructure, colocation and multi-asset market data via its Atlas platform.
Pico: Sells managed low-latency network infrastructure, colocation, market data and the Corvil packet-analytics platform to trading firms and exchanges.
Preqin: London-based data and analytics provider for private markets, covering private equity, credit, real estate and infrastructure.
Quiver Quantitative: Turns congressional trades, insider filings, lobbying spend and government contracts into a retail dashboard and paid API.
QUODD: Cloud-native provider of real-time, historical, and reference market data via APIs, feeds, and desktop workstations.
QuoteMedia: Publicly traded (OTCQB: QMCI) market-data vendor that syndicates white-label quotes, filings and IR widgets to brokerages and media firms.
RavenPack: Uses NLP to turn news, filings and transcripts into structured sentiment and event data for systematic trading.
Rithmic: Broker-neutral order routing and real-time futures market data infrastructure that underpins most funded-account prop trading firms.
Santiment: Crypto behavioral-analytics platform combining on-chain, social sentiment and developer data for 2,500+ digital assets via Sanbase and SanAPI.
Similarweb: NYSE-listed firm (SMWB) that models web and app traffic data into an alternative-data feed for hedge funds, banks and marketing teams.
SIX Financial Information: Zurich based reference and market data vendor and the official ISO 4217 currency code maintenance agency, tracing back to 1930.
S&P Global Market Intelligence (Capital IQ): S&P Global's data arm; its Capital IQ Pro platform delivers company, credit and private-market data via web, Excel plugin and API.
The Tie: New York crypto data provider whose Tie Terminal and Sentiment API serve about 500 institutional clients, from hedge funds to exchanges.
Tiingo: Self-funded financial data API selling flat-rate EOD, real-time IEX, fundamentals, news, crypto and FX feeds since 2014.
Token Terminal: Decodes raw blockchain activity into standardized, financial-statement-style metrics (revenue, fees, TVL) for crypto protocols.
TraderMade: UK market data vendor aggregating non-skewed FX rates from tier-one and tier-two banks since 1984, also covering crypto, CFDs and metals.
Trading Economics: Web platform and API providing 20 million economic indicators and forecasts for 196 countries, sourced from official statistics agencies.
TrueFX: FX market data arm of Integral Development Corp: free tick history since 2009, paid institutional streaming since 2019.
Twelve Data: API and WebSocket provider of real-time and historical prices, fundamentals, and indicators across stocks, forex, crypto, ETFs, and commodities.
Xe (XE.com): Runs the XE.com currency converter and sells a paid Xe Currency Data API covering 220+ currencies to businesses.
Xignite: US vendor selling 500+ REST APIs for real time, delayed and historical market data, billed as flat fee unlimited usage rather than per call.
Yahoo Finance: Free consumer financial portal for stock quotes, charts and news, with paid Bronze/Silver/Gold tiers layering on research and up to 40 years of historical data.
YipitData: Turns web-scraped, receipt, and card-transaction data into company-level performance metrics for hedge funds and corporates.
