Best APIs & Data Feeds Tools for Investing

Alpha Vantage

Alpha Vantage is an API-first source for market and economic data. Developers, students, quants, and analysts can pull stocks, funds, FX, crypto, options, commodities, fundamentals, news, sentiment, and macro series with one key. The free quota is small, and commercial use needs separate licensing.

PortfoliosLab

PortfoliosLab offers portfolio backtesting, optimization, risk, correlations, screens, and AI-assisted workflows across stocks, ETFs, funds, crypto, and models. Paid plans add more history, imports, exports, and MCP access.

OpenMarket

OpenMarket combines market charts, order-book heatmaps, footprints, watchlists, alerts, and custom kScript indicators in a web workspace. It covers crypto, stocks, futures, FX, metals, prediction markets, and economic data. Free charting and a separate Data API free tier are available; Plus adds higher limits and heavier order-flow tools.

SentiSense

SentiSense is a beta AI market-intelligence and data API service for stock data, sentiment, news clusters, social signals, institutional flows, insider trades, congressional disclosures, and generated analysis. It supplies research signals, not brokerage or advice.

Financial Filings provides public-company filings through a free web index, APIs and a hosted MCP server. It supports document search, Markdown extraction, standardized financials, webhooks and enterprise data delivery.

Ghostfolio

Ghostfolio is an open-source portfolio and wealth tracker with self-hosting, multiple accounts, net-worth dashboards, imports, charts, risk views, and a REST API. A free managed Basic plan offers hosting; Premium adds advanced analytics and professional market data. Self-hosting means handling deployment, security, backups, and updates yourself.

FRED (Federal Reserve Economic Data)

FRED is the Federal Reserve Bank of St. Louis' free macroeconomic database. Use its series, charts, release calendar, Excel tools, mobile apps, and REST API for inflation, rates, GDP, employment, FX, credit, and market indicators. It is macro context, not equity fundamentals or brokerage infrastructure; API access needs a free key.

MesoSim

MesoSim is an options backtesting service with low-code strategies, multi-leg simulations, risk graphs, Greeks, volatility surfaces, margin models, and paper or live workflow paths. It is options research, not general stock research or portfolio accounting.

ORTEX

ORTEX combines short interest, securities lending, options flow, and trading-signal data for active investors, analysts, and data teams. Deeper web and API access sits behind paid tiers. It is a signal service, not a broker or portfolio ledger.

Quartr

Quartr provides earnings calls, live transcripts, filings, reports, decks, estimates, AI chat, and investor-relations data. The app is useful for free call and transcript access; Pro and API serve professional research, MCP, webhooks, and integrations.

SEC.gov (EDGAR)

SEC.gov EDGAR is the official free source for U.S. company, fund, insider, and 13F filings, with full-text search, RSS, bulk archives, and public JSON APIs. It is the validation source for filings research, not a polished commercial terminal.

Portfolio123 combines stock and ETF screens, ranking systems, point-in-time backtests, portfolio tracking, broker links, DataMiner, and API access.

Charles Schwab

Charles Schwab combines a U.S. brokerage, research, screeners, tax workflows, thinkorswim, paper trading, alerts, market data, and Trader API access. It suits investors who want one regulated account for long-term investing and active trading. It is a broker, not an open market-data API.

ECB Data Portal

The European Central Bank's free portal provides euro-area statistics, policy rates, exchange rates, yield curves, macroeconomic series, metadata, and an SDMX API.

Fintel

Fintel brings short interest, off-exchange volume, institutional ownership, insider trades, ETF exposure, options sentiment, filings, screens, alerts, APIs, and AI research into ticker pages. It is useful for studying positioning and crowding before deeper fundamental work. Premium data, exports, options flow, AI, and portfolio tools depend on the plan, and the signals are inputs rather than recommendations.

Office of Financial Research (U.S. Treasury)

The Office of Financial Research publishes U.S. Treasury financial-stability monitors, funding data, money-market transparency, bank risk views, and hedge-fund datasets in public JSON and CSV. It supports macro and market-structure research, not real-time trading, stock screens, or portfolio tracking.

Quiver Quantitative

Quiver Quantitative provides dashboards, screens, alerts, backtests, and APIs for political trades, insiders, institutions, lobbying, government contracts, patents, apps, ETFs, dark pools, and other alternative data. Web Premium and Quiver API are separate products, and the signals can be noisy or delayed.

WhaleWisdom

WhaleWisdom organizes institutional 13F, 13D/G, and other ownership filings into fund pages, holdings, changes, screens, alerts, and data exports. It is useful for studying disclosed institutional portfolios, but the filings are delayed and incomplete.

Wisesheets

Wisesheets brings financial statements, ratios, prices, estimates, dividends, and other market data into Google Sheets and Excel. It suits spreadsheet-heavy research and models, not brokerage execution, a full terminal, or unrestricted redistribution.

GuruFocus

GuruFocus combines global fundamentals, valuation, GF Score, GF Value, stock, ETF, and bond screens, backtests, guru and institutional holdings, insider trades, portfolios, spreadsheet add-ins, and APIs. It is built for fundamental and value research, not brokerage execution.

Unusual Whales

Unusual Whales tracks options flow, dark pools, congressional trades, insider activity, market data, alerts, screeners, and social sentiment. It is built for active traders and alternative-data research, not a broker, portfolio ledger, or guarantee that unusual activity predicts returns.

ETF Insider

ETF Insider analyzes stocks, ETFs, and mutual-fund portfolios for holdings overlap, concentration, correlations, exposure, and efficient-frontier tradeoffs. Full holdings and Excel export require Pro; API and white-label access require Enterprise.

Roic AI

Roic AI provides company financials, ratios, valuations, transcripts, news, stock screens, spreadsheet add-ins, a REST API, and an MCP server. Plans differ by request rate, financial and transcript history, and commercial-use rights.

Ahrefs

Ahrefs gives investors a way to check the web demand around digital businesses, publishers, marketplaces, SaaS companies, and consumer brands. It measures search traffic, keywords, backlinks, and AI visibility. Those numbers are estimates, not company filings or a portfolio system.

AlphaSense

AlphaSense is a research system for institutional investors, strategy teams, consultants, investor-relations teams, and corporate researchers. It searches broker research, expert transcripts, filings, news, financial data, and private documents. Annual pricing is handled by sales.

Danelfin

Danelfin scores stocks and ETFs from 1 to 10 based on its estimate of three-month market outperformance. Use the score, rankings, screens, alerts, and API for idea generation. It is a signal layer, not a complete investment process.

Global Factor Data (JKP Factors)

Global Factor Data publishes equity factor returns, underlying portfolios, industry returns, reference files, and construction code. It covers 153 published factors across 93 countries and four regions. The data is for noncommercial research, not live trading.

Listen Notes

Listen Notes is a podcast search engine, API, alerts service, and dataset seller. Investors can search interviews, monitor keywords, and analyze podcast metadata as one research input. A podcast mention is not a verified financial disclosure.

MarketInOut

MarketInOut screens stocks, ETFs, forex, and crypto with formulas, historical screens, strategy backtests, alerts, watchlists, portfolios, correlations, and one-time membership terms. It suits traders who want custom rules without a monthly SaaS bill. Free use is limited and there is no broker execution, sync, or automation.

okama is an open-source portfolio analytics toolkit with web widgets, a REST API, and Python for efficient frontiers, risk, Monte Carlo, cash flows, and historical market or macro data. It suits technical users who want reproducible analysis.

QuantConnect

QuantConnect uses the open-source LEAN engine for research, backtesting, cloud deployment, broker connections, and live algorithmic trading. It is for technical Python and C# users building systematic strategies, not a simple charting app.

Sharesight

Sharesight records portfolios, dividends, performance, and tax reports across brokers and asset types. It is built for DIY investors, accountants, advisers, and family offices. It does not place trades or replace a tax professional for complex filings.

StockAlert Pro

StockAlert Pro monitors stocks and ETFs through configurable alerts, watchlists, AI equity reports, and developer integrations. It covers price, technical, volume, fundamental, dividend, and scheduled conditions. It does not place trades or replace portfolio accounting.

Tracefour

Tracefour provides free insider-trade heatmaps, filing email alerts, and a read-only API covering U.S. filings, selected European director dealings, and U.S. Congress disclosures.

Visualping

Visualping monitors web pages for changes with controls for frequency, thresholds, screen regions, selectors, wait times, proxies, and browser actions. It can support research and compliance monitoring, but it does not provide market data or trade execution.

TipRanks

TipRanks combines analyst ratings, targets, expert rankings, Smart Score, AI analysis, news sentiment, insider signals, hedge-fund activity, and portfolios. It is useful for comparing market views quickly, with Premium and Ultimate adding deeper expert, portfolio, export, and AI tools.

Interactive Brokers (IBKR)

Interactive Brokers serves active investors, professionals, quantitative traders, and institutions across global markets. It supports advanced orders, SmartRouting, APIs, paper trading, and portfolio analysis. Products, commissions, data fees, protection, and API limits depend on market, account, entity, and country.

SEC EDGAR - Company Filings (Full‑Text Search & Search Filings)

SEC EDGAR is the free public source for company, fund, insider, ownership, prospectus, and XBRL filings submitted to the SEC. It has full-text search, latest filings, RSS, CIK lookup, public JSON APIs, archives, and bulk files. Most filings still need parsing before comparison or analysis.

Kubera

Kubera is a paid balance-sheet and portfolio tracker for households, founders, expats, advisors, and family offices. It aggregates banks, brokers, crypto, real estate, private equity, alternatives, documents, beneficiaries, and currencies, with scenarios, estate handoff, advisor portals, and an API. It is reporting software, not a broker, tax engine, or rebalancer.

Masttro

Masttro is an enterprise wealth system for ultra-high-net-worth families, family offices, RIAs, banks, and professional firms. It consolidates custodians, entities, currencies, alternatives, documents, compliance, portals, and AI workflows. Pricing is quote-based and implementation-led.