Best Free API Investing Tools

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.

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.

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.

Uncle Stock

Uncle Stock screens more than 100,000 global stocks with financial metrics, valuation models, scores, historical tests, watchlists, and alerts. Gold adds CSV and JSON access, an MCP server, and limited portfolio tracking. It is not a broker or an intraday trading simulator.

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.

13F Insight

13F Insight pulls institutional holdings, insider trades, and ownership filings into one research workspace. Its AI can answer questions with filing citations, but the filings arrive late and the generated summaries still need a check against the SEC documents.

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.

Alpha Spread

Alpha Spread combines DCF and relative-value estimates, stock reports, screens, alerts, analyst forecasts, watchlists, and a company-question assistant. Free use is metered weekly.

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.

ApeWisdom

ApeWisdom tracks ticker mentions across Reddit, WallStreetBets-style forums, crypto communities, and 4chan /biz. It is useful for seeing where retail attention is moving. Mentions are noisy, so a leaderboard is not a view on value or price direction.

Bank of England

The Bank of England site is the primary free source for UK monetary-policy decisions, MPC minutes, Monetary Policy Reports, rates, exchange rates, statistics, and yield-curve files. It is a reference source for macro research, not a trading app. Some series arrive as downloads rather than through a complete API.

Bank of Japan (BOJ)

The Bank of Japan site publishes Japan's monetary-policy releases, meeting calendar, statistics, charts, time-series downloads, and API access. It is useful for primary-source rates, FX, money stock, TANKAN, balance-of-payments, and central-bank data. It is not a security research or trading terminal.

BIS Data Portal

The Bank for International Settlements' free data portal covers banking, credit, debt, derivatives, liquidity, property prices, exchange rates, central banks, and payments. It includes charts, downloads, a release calendar, and an SDMX API.

BizToc

BizToc aggregates business and finance stories in a configurable grid and chronological Wire feed. It also provides a market snapshot, imagery view, search, RSS, and a RapidAPI feed. Users should open the original publisher before relying on a story.

Börsdata

Börsdata gives investors long-history Nordic fundamentals, ratios, screens, ownership, insider and short-selling data, technical charts, reports, watchlists, calendars, and spreadsheet or API access. It is strongest for Nordic equities. Global data, holdings, Excel or Sheets workflows, and the REST API depend on the plan.

Business Quant

Business Quant covers U.S. company fundamentals, operating KPIs, segment data, analyst estimates, institutional ownership, and insider trades. It is useful when company-specific operating measures matter alongside standard financial statements. The free plan limits KPI history and API usage, while paid plans increase history and usage allowances.

Calcbench

Calcbench extracts and standardizes financial data and disclosure text from SEC filings. Users can trace values to source documents, compare filings, work in Excel, or license API access separately.

Cbonds

Cbonds is a bond-data service for professional and private investors. Search bonds, quotes, yields, ratings, new issues, events, watchlists, and portfolios. Companies can also license API and file feeds or an Excel add-in.

CFPB Consumer Complaint Database

The CFPB Consumer Complaint Database publishes complaints about consumer financial products and services. Users can study complaints by company, product, issue, geography, response, and narrative through the site, a CSV download, or the API. The CFPB does not verify the consumer's account.

Changeflow (Trackly)

Changeflow, formerly Trackly, monitors web pages, PDFs, feeds, and API endpoints. It summarizes detected changes for review. It does not supply market prices or execute trades.

CME FedWatch

CME FedWatch converts 30-Day Fed Funds futures into market-implied probabilities for upcoming FOMC rate outcomes. It is useful for rates and macro monitoring, with a free web tool and paid end-of-day or intraday APIs. The probabilities are market pricing, not Fed guidance.

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.

Diffchecker

Diffchecker compares text, Word files, PDFs, Excel files, images, folders, and API responses. It is useful for spotting changes in filings, research drafts, models, contracts, or disclosures. It does not supply the financial data being compared.

Dune

Dune lets users query decoded blockchain data with SQL and turn it into dashboards, APIs, alerts, uploads, and agent workflows. It is for custom onchain research across many chains, not a fixed crypto market-data screen.

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.

EDINET

EDINET is Japan's official corporate-disclosure system. Search issuers, securities, funds, stock codes, document types, keywords, and dates, then retrieve filings, XBRL resources, taxonomy files, and API results.

EIA Open Data

EIA Open Data is the U.S. government's source for energy statistics and operational data. Browse the series or use the free API, bulk files, and spreadsheet tools for commodity, utility, macro, and energy-market research.

EPSMomentum

EPSMomentum focuses on earnings momentum and entry timing. It combines estimate revisions, post-earnings drift, timing signals, scanners, AI analysis, and market dashboards for U.S. stocks and ETFs.

Estimize

Estimize collects crowdsourced EPS, revenue, and macro forecasts before company reports and economic releases. It gives investors and data teams an expectations benchmark alongside official estimates. It is not a portfolio manager or execution platform.

ETF Action

ETF Action is a professional ETF research and model-building service. It covers classification, look-through holdings, overlap, flows, model portfolios, 13F screens, exports, and enterprise data workflows. It is for teams that need more than a free quote page.

European Central Bank (ECB) - Statistics & Data

European Central Bank Statistics & Data is the ECB's primary source for euro-area statistics, policy rates, FX reference rates, yield curves, inflation, macro indicators, downloads, and SDMX access. It supplies the data behind macro research, not investment-app commentary.

FactorsToday

FactorsToday publishes factor returns and stock exposures through web tools, downloads, and an open REST API. Its portfolio analysis, attribution, optimizer, factor builder, and hedge builder are research models, not brokerage or accounting systems.

FDIC BankFind Suite (BankFind)

The FDIC's free lookup and data service covers insured U.S. banks and branches, bank histories, structure changes, failures, financials, deposits, API access, and bulk files.

Federal Reserve Bank of New York - Data & Statistics

The New York Fed publishes reference rates, market-operations data, SOMA holdings, primary-dealer statistics, surveys, and research indicators. It is useful for SOFR, EFFR, OBFR, funding markets, Treasuries, agency MBS, and macro data through exports and APIs, not for screening or trading.

Financial Modeling Prep (FMP)

Financial Modeling Prep provides API and spreadsheet access to market data, fundamentals, news, calendars, transcripts, ownership, and macroeconomic data. The free Basic tier is an end-of-day test plan. Real-time, global, transcript, 13F, intraday, and bulk access require paid plans. Display or redistribution requires a separate commercial agreement.

FinancialData.Net

FinancialData.Net provides market data, fundamentals, ownership, options, funds, ESG, calendars, and news through REST, Excel, and MCP interfaces. It covers stocks, ETFs, mutual funds, futures, crypto, foreign exchange, commodities, OTC securities, and indexes. The free plan is limited, and the homepage security claims are not supported by a public audit report.

FinancialJuice

FinancialJuice delivers live market headlines, audio squawk, text updates, macro-calendar context, and event alerts across equities, rates, FX, commodities, crypto, and futures. Its WebSocket API exposes headlines and calendar events. It is for awareness around releases and news, not deep valuation; real-time and API access depend on the plan.

FinancialReports.eu

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.

Finatic

Finatic connects user brokerage accounts to a common API for accounts, balances, positions, orders, and transactions. It also provides broker-specific connection flows, user grants, signed webhooks, sandbox data, and trading where supported.

Find and update company information (Companies House)

Companies House Find and update company information is the official UK register for companies, filings, officers, people with significant control, and document images. Use it for private-company checks, due diligence, filing alerts, and registry-driven applications. It is primary registry data, not analyst research.