Best Free APIs & Data Feeds Tools for Investors

FRED (Federal Reserve Economic Data)

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FRED (Federal Reserve Economic Data) is the free macroeconomic time-series database from the Federal Reserve Bank of St. Louis, used by students, investors, analysts, quants, and product builders who need trusted economic data, charts, release calendars, Excel access, mobile apps, and a REST API. It is strongest for official macro context around inflation, rates, GDP, employment, exchange rates, credit, and market indicators rather than equity fundamentals or brokerage workflows. API users need a free API key, and usage remains subject to FRED terms and source-specific data restrictions.

Portfolio123

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Portfolio123 is a rules-based quant research and portfolio-management platform for investors who want stock and ETF screeners, ranking systems, factor research, realistic backtests, strategy simulations, portfolio tracking, broker connectivity, and API/DataMiner access. It is strongest for systematic investors who want point-in-time research workflows without building everything from code.

Roic AI

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Roic AI is a financial data, stock research, and API platform for investors and developers who want company financials, transcripts, news, screeners, exports, spreadsheet endpoints, AI research assistance, and MCP or ChatGPT workflows. It is strongest for fundamentals and agent-ready data access, with worldwide coverage on every plan, but plan differences matter for rate limits, history depth, transcript depth, and commercial API use.

Financial Modeling Prep (FMP)

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Financial Modeling Prep (FMP) is a market-data API and spreadsheet-data provider for developers, analysts, quants, and product builders who need equities, ETFs, funds, FX, crypto, commodities, macro, ESG, ownership, news, calendars, transcripts, and fundamentals from one vendor. It is strongest when you want REST and WebSocket access plus Excel and Google Sheets add-ins at a lower entry price than enterprise terminals. The main buying questions are plan limits, geography, history depth, and dataset access: the free Basic tier is a limited EOD sandbox, while real-time, global, transcript, 13F, holdings, intraday, and bulk workflows require paid tiers.

ECB Data Portal

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ECB Data Portal is the official free European Central Bank source for ECB statistics, euro area macro data, interest rates, exchange rates, yield curves, downloads, charts, and SDMX API access. Use it when you need primary-source European macro data rather than a commercial terminal summary.

OpenBB

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OpenBB combines an open-source financial data layer with a hosted Workspace for dashboards, AI research, custom agents, and team workflows. It is best for analysts, quants, developers, and firms that want to connect their own market data, internal datasets, provider API keys, widgets, MCP tools, and AI workflows instead of buying a closed terminal. Community access is useful for individuals, while Pro adds collaboration, exports, Excel, RBAC, SSO, MFA, and private deployment options. OpenBB does not provide production market data itself; it orchestrates connectors, your data, and your vendor access.

Ahrefs

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Ahrefs is an SEO and marketing intelligence platform that investors can use as alternative data for digital businesses, marketplaces, publishers, SaaS companies, and consumer brands where search visibility and web demand matter. It is strongest for website traffic estimates, keyword demand, backlinks, content visibility, API exports, and AI-brand visibility, but it is not an investing terminal, valuation model, portfolio tracker, or source of official company fundamentals.

Alpha Vantage

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Alpha Vantage is an API-first financial data provider for developers, students, quants, and analysts who need a simple API key for stock, ETF, mutual fund, FX, crypto, options, commodities, fundamentals, news, sentiment, and macroeconomic datasets. It is strongest for learning, prototypes, spreadsheets, and personal API workflows, but the free quota is small, premium endpoints require membership, and commercial use needs separate licensing.

Office of Financial Research (U.S. Treasury)

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Office of Financial Research is a free U.S. Treasury source for official financial-stability monitors, stress indicators, short-term funding data, money-market fund transparency, bank systemic-risk views, and hedge-fund monitor datasets. It is useful for macro, risk, policy, and market-structure research where documented methodology and public JSON or CSV access matter more than a polished investing app. OFR data is generally monitor-specific and often end-of-day or lagged. It is not a real-time market-data feed, stock research terminal, broker, portfolio tracker, or broad trading dataset.

ETF Insider

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ETF Insider is a web-based ETF, mutual fund, and stock portfolio visualization tool for investors who want to see holdings overlap, concentration, correlations, factor exposure, and efficient-frontier style portfolio tradeoffs. It is strongest for diagnosing hidden ETF overlap in U.S.-listed portfolios, with full holdings depth, Excel export, API access, and white-label options gated by Pro or Enterprise plans.

Interactive Brokers (IBKR)

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Interactive Brokers (IBKR) is a global multi-asset brokerage platform for active investors, professionals, quants, and institutions who need broad market access, advanced order types, SmartRouting, APIs, paper trading, and portfolio analytics. It is strongest for serious execution and automation workflows, but commissions, market-data subscriptions, product availability, and API limits vary by market, account type, and jurisdiction.

Fintel

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Fintel is a market-signal research platform for investors who want short interest, off-exchange volume, institutional ownership, insider trades, ETF exposure, options sentiment, filings, screeners, dashboards, alerts, APIs, and AI-assisted research in one place. It is strongest for ticker-level signal pages and ownership/short-interest workflows that help explain positioning, crowding, and unusual activity before deeper fundamental work. Many premium datasets, AI workflows, exports, options flow, and portfolio tools are tier-gated, and the signals should be treated as research inputs rather than investment recommendations.

Trading Economics

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Trading Economics is a macro and markets data platform for browsing economic indicators, calendars, forecasts, market data, company financials, news, ratings, and corporate events, with paid REST API, WebSocket, spreadsheet, BI, and AI-assistant integrations. It is strongest for developers, analysts, and teams building dashboards, alerts, research apps, and macro data pipelines from one source. Guest credentials provide limited sample access, while Standard, Professional, and Enterprise plans govern real API use, streaming, rate limits, row limits, and commercial rights. It is data infrastructure, not a broker or investment-advice service.

Danelfin

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Danelfin is an AI stock and ETF scoring platform built around a 1-10 AI Score that estimates the probability of outperforming the market over the next three months. Use it as a ranking, screening, portfolio-alert, and API layer for idea generation, not as a standalone investment process.

Federal Reserve Board (FRB.gov)

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Federal Reserve Board (FRB.gov) is the official U.S. central-bank source for policy materials, FOMC calendars, statistical releases, interest rates, balance sheet data, bank data, FX rates, industrial production, and Data Download Program files. Use it as a primary macro source, not a commercial investing terminal.

Global Factor Data (JKP Factors)

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Global Factor Data, often called JKP Factors, is a free academic research dataset and web interface for global equity factor returns, stock characteristics, and reproducible factor-construction code based on Jensen, Kelly, and Pedersen. It is best for quants, researchers, students, and factor-investing teams that need transparent evidence on global factor performance rather than marketing claims. The data is not a live trading feed, and the license is non-commercial unless separate permission is granted.

Listen Notes

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Listen Notes is a podcast search engine, podcast API, alerts product, and dataset provider that can be useful for investors, analysts, and builders treating podcasts as alternative research inputs. Use it to search podcast metadata, monitor keyword mentions, build podcast discovery workflows, or buy/export podcast datasets for analysis. Podcast mentions are indirect evidence, so Listen Notes should complement financial statements, filings, market data, and verified sources rather than replace them.

MesoSim

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MesoSim is an options strategy backtesting platform for traders who need low-code strategy definitions, multi-leg simulations, risk graphs, Greeks, volatility surfaces, margin models, and paper/live workflow paths. It is narrow by design: options research first, not broad stock research or portfolio accounting.

ORTEX

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ORTEX is a market-data and analytics platform best known for short interest, securities lending, options flow, and trading-signal context. It fits active investors, analysts, and data teams that need more than a basic quote page, with deeper web-app and API access moving behind paid tiers.

Quiver Quantitative

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Quiver Quantitative is an alternative-data platform for investors who want dashboards, screeners, alerts, backtests, and API access around political trading, insider activity, institutional holdings, lobbying, government contracts, patents, app data, ETF exposure, dark-pool activity, and related datasets. It is strongest when conventional fundamentals are not enough and users want differentiated public-disclosure signals. Web Premium and Quiver API are separate products with different prices, trials, dataset tiers, and commercial-use rules. Alternative data can be noisy and lagged, so it needs validation before being treated as a signal.

Similarweb

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Similarweb is a digital intelligence and website traffic analytics platform for researching web traffic, app usage, keywords, referrals, competitors, companies, technologies, and online market share. For investors, it is best treated as alternative data for digital businesses such as marketplaces, ecommerce, SaaS, media, travel, and consumer internet, not as reported financials. Search demand is large and commercial around Similarweb, website traffic analytics, and Similarweb API, but meaningful API, history, exports, integrations, and enterprise workflows are paid or custom. It is not a broker, portfolio tracker, valuation model, fundamentals terminal, or direct source of company revenue.

StockAlert Pro

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StockAlert Pro is an alert-first stock and ETF monitoring platform with configurable alerts, watchlists, AI equity reports, API keys, webhooks, SDKs, and integrations. It is useful when investors or builders need notifications and automation around price, technical, volume, fundamental, dividend, and time conditions, but it is not a broker, full research terminal, or portfolio accounting system.

Visualping

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Visualping is a website-change monitoring and alerting platform that investors, compliance teams, and analysts can use to watch regulator pages, investor-relations pages, pricing pages, competitor pages, and other web sources. It is best treated as a web-native monitoring layer, not a market-data feed, normalized financial database, broker, or guarantee that every page change is investment-relevant.

WhaleWisdom

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WhaleWisdom is a 13F, institutional ownership, insider, and hedge-fund holdings platform for investors who track filer activity, fund portfolios, watchlists, backtests, exports, and API workflows. It is useful for holdings research, but 13F data is delayed and the deeper history/API workflow is paid.

TipRanks

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TipRanks is an investment research platform built around analyst ratings, price targets, expert rankings, Smart Score, AI stock analysis, news sentiment, insider signals, hedge-fund activity, and portfolio tools. It is strongest for investors who want to compare market opinions and stock forecasts quickly, with Premium and Ultimate unlocking more of the expert, portfolio, export, and AI workflow.

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

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SEC EDGAR Search is the official free source for U.S. public company, fund, insider, ownership, prospectus, and XBRL filing research. It is strongest as the source of truth for SEC filings, full-text search, latest filings, RSS feeds, CIK lookup, and data.sec.gov JSON APIs, but raw filings still require parsing and automated access must follow SEC fair-access rules.

Unusual Whales

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Unusual Whales is an options-flow and market-activity platform for traders who want real-time U.S. options trades, dark pool/off-exchange activity, alerts, screeners, news, congressional trading data, and developer API access. It is strongest for alert-driven options and order-flow research, with portfolio tracking, API, WebSocket streaming, and historical full-market options data handled through separate paid surfaces.

AlphaResearch

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AlphaResearch is an AI-powered stock research platform for searching filings, transcripts, press releases, reports, notes, fundamentals, estimates, news, insider transactions, institutional ownership, and fund holdings. It is useful for document-heavy research and collaboration, but global coverage and spreadsheet add-ins are Enterprise features and the premium trial requires a credit card.

ApeWisdom

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ApeWisdom is a free social-sentiment and ticker-attention tracker for traders and researchers watching Reddit, WallStreetBets-style communities, crypto subreddits, and 4chan /biz. It is strongest for spotting retail attention and meme-stock chatter early, with public leaderboards and API endpoints, but ticker mentions are noisy and should not be treated as investment quality or price direction.

Autochartist

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Autochartist is an automated market-scanning and trader-engagement platform for active traders, brokers, and trading platforms that want chart-pattern detection, technical trade setups, economic-event analysis, news sentiment, alerts, position sizing, and API or MetaTrader integrations. It is strongest as a signal and workflow layer around technical trading, but pricing, modules, and access often depend on a broker or enterprise relationship rather than a simple public checkout.

Bank of England

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The Bank of England website is the official free source for UK monetary policy decisions, Bank Rate context, MPC calendars and minutes, Monetary Policy Reports, statistics, exchange-rate and interest-rate series, and UK yield-curve downloads. It is strongest as a primary-source macro and rates reference for analysts, students, investors, and developers, but it is not an investing app and some datasets, including yield curves, are delivered as files rather than a full API.

Bank of Japan (BOJ)

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The Bank of Japan website is the official free source for Japanese monetary policy releases, meeting schedules, BOJ statistics, release calendars, time-series downloads, charts, and API access. It is strongest for analysts, students, developers, and investors who need primary-source Japan rates, FX, money stock, TANKAN, balance-of-payments, and central-bank data, but it is a macro data source rather than an investing app or security-level research terminal.

BIS Data Portal

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BIS Data Portal is the official free statistics portal from the Bank for International Settlements for global macro-financial time series, exports, bulk downloads, release calendars, charts, tables, and SDMX API access. It is strongest for analysts, students, quants, and builders who need cross-country banking, credit, debt, derivatives, liquidity, property-price, exchange-rate, and central-bank statistics, but it is an official macro data source rather than an equity terminal or trading platform.

BizToc

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BizToc is a free business and finance news aggregator for investors who want a fast headline grid, real-time Wire feed, market snapshot, imagery view, search, RSS, mobile access, and a lightweight API route through RapidAPI. It is strongest for quick market-awareness and headline discovery before reading original sources, but it is an aggregator rather than original reporting, valuation research, portfolio analytics, or a full financial-data platform.

Börsdata

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Börsdata is a Nordic-first equity analytics, screening, and data platform for investors who want long-history fundamentals, thousands of ratios, strategy screens, ownership data, insider and short-selling context, technical charts, reports, watchlists, calendars, and API or spreadsheet access. It is strongest for Nordic stock research, while global coverage, holdings data, Excel/Sheets workflows, and REST API access depend on paid tiers and professional users are routed to Enterprise.

Business Quant

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Business Quant is a U.S. equities research, screening, KPI, and financial-data platform for investors who want fundamentals, operating metrics, segment data, analyst estimates, ratings, warnings, 13F ownership, insider trades, exports, and API access. It is strongest for U.S. stock research where business-driver KPIs matter, but free KPI depth is shallow and serious API, export, history, and commercial-use workflows require paid plans.

Calcbench

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Calcbench is a professional SEC filing, XBRL, financial statement, disclosure, and Excel research platform for analysts who need traceable as-filed numbers, standardized accounting metrics, footnotes, redlines, proxy data, compensation data, M&A details, and API access. It is strongest for accounting-heavy U.S. equity research and data workflows, but meaningful access is priced for professional users and API access is sold separately from standard subscriptions.

CFPB Consumer Complaint Database

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CFPB Consumer Complaint Database is the official free U.S. regulatory dataset for consumer financial complaints about banks, lenders, credit bureaus, fintechs, debt collectors, mortgage servicers, cards, payments, and other consumer-finance products. It is strongest for analysts who need complaint trends by company, product, issue, geography, response status, narrative availability, downloads, and API access, but complaints are submissions rather than verified findings.

Changeflow (Trackly)

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Changeflow, formerly reached through Trackly, is an AI website-change intelligence platform for monitoring filings, regulator pages, IR pages, competitor pages, PDFs, feeds, and other online sources. It is useful for investment and compliance teams that want relevant briefings rather than raw page diffs, but it is not market data, trade execution, or a substitute for human review.

CME FedWatch

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CME FedWatch is the widely used CME Group tool for tracking market-implied probabilities of Federal Reserve target-rate outcomes for upcoming FOMC meetings, derived from 30-Day Fed Funds futures. It is strongest for macro investors, rates teams, journalists, and dashboards monitoring Fed-rate expectations, with a free web tool plus paid EOD and intraday API options, but probabilities are market-implied estimates, not Fed guidance or investment advice.