VOL. XCIV, NO. 247
★ FINANCIAL TOOLS & SERVICES DIRECTORY ★
PRICE: 5 CENTS
Sunday, October 5, 2025
Best Free APIs & SDKs Tools for Investors
Every product on this page includes a genuinely free tier, so you can plug trusted apis & sdks software into your workflow without swiping a card.
We filtered our full directory to focus on the 42 free apis & sdks platforms investors lean on today. Community voting keeps the rankings honest, while editorial picks highlight standout experiences for research, screening, and execution. Use this shortlist to compare pricing limits, supported platforms, and capabilities before graduating to paid upgrades.
More ways to explore
Want the full picture? The main category page covers 46 total apis & sdks tools, and the broader Find My Moat directory spans more than 205 investing platforms.
Top 10 picks
10 picks- 1
A global equity research and value-investing platform with robust screening, backtesting, and portfolio tools. Features and data access depend on plan tier—Premium vs. Premium Plus—while enterprise-level users can license data directly via API. Add-ins for Excel and Google Sheets extend workflows, though usage caps apply to lower tiers. Alerts and mobile apps are included across paid plans.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, Mobile, API - 2
Global market-data API provider offering both REST and WebSocket access. The free tier includes delayed quotes (15–20 minutes), while premium plans unlock real-time streaming for US equities, forex, and crypto (up to 50 tickers). Intraday, tick-level, and certain specialized datasets are available as add-ons. Rate limits scale up to 1,000 requests per minute, with daily caps depending on plan tier.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 3
Market data delivered through REST and WebSocket APIs. Plans scale by geography and depth: Starter covers U.S. markets, Premium adds UK/Canada and extended history, and Ultimate unlocks global coverage, transcripts, fund and 13F data, one-minute intraday, and bulk delivery options. Bandwidth and query limits vary by plan.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 4
A commercial API suite for SEC/EDGAR data, designed for developers, quants, and compliance teams. The free tier includes 100 calls per month. Paid tiers unlock higher rate limits, more data (5 GB vs 15 GB monthly, with $0.30/GB overage), and features such as multiple API keys or redistribution rights for enterprise users. The platform emphasizes speed, with new filings typically available in under 300 ms.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 5
ETF & mutual fund overlap/correlation and portfolio visualization tool featuring Sankey look‑through, correlation matrices, and efficient‑frontier (Sharpe) views. Free tier allows up to 4 saved portfolios and limited full‑holdings visibility; Pro ($14/mo) unlocks unlimited portfolios, full holdings depth, and Excel export. Enterprise adds a financial data API, custom reports/visualizations, and white‑label options. Coverage explicitly includes **US‑listed ETFs & mutual funds**; equities coverage is described as **international** on pricing, but the FAQ states non‑US assets not listed in the US are not supported (current constraint). Holdings are sourced primarily from SEC EDGAR and refreshed on a quarterly cadence based on filings; data may be delayed per exchanges/providers.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 6
Quant research and live-deployment platform with point-in-time fundamentals and estimates. Users can screen, backtest, and simulate strategies, then deploy them live with broker integrations. Supports API access and a no-code desktop DataMiner. FactSet or S&P Compustat licenses are required for full historical fundamentals.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, Desktop, API - 7
Quartr brings together earnings calls, transcripts, filings, reports, and slides into one platform. The free mobile app is consumer-friendly, while Quartr Pro (desktop) and the API are enterprise products sold on a custom basis. The API is generous—paying customers get effectively unlimited calls, demo accounts are capped, and a 50 rps global rate limit goes into effect in December 2025. Live audio and transcripts are delivered in real time, making it a go-to tool for analysts who don’t want to wait.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, Mobile, API - 8
Real-time options flow and dark-pool analytics built for active traders. Free plans view delayed data; paid tiers stream live flow, with annual plans unlocking data downloads. The public API is sold separately, and “Periscope” (market-wide SPX exposure) is available as an add-on.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, Mobile, API - 9
A leading SEO and web-traffic intelligence suite. The free Ahrefs Webmaster Tools unlocks limited access to Site Explorer, Site Audit, and Web Analytics for verified sites, while full platform plans expand into deep backlink, keyword, and content analysis. Higher-tier subscriptions govern credits, export limits, historical data windows, and API access.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 10
REST APIs delivering global market data in JSON and CSV. The free tier allows 25 requests per day, while premium plans remove limits and unlock real-time and 15-minute delayed US equities plus real-time US options. Entitlements and account management are handled through the Alpha X Terminal.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API
- 11
A widely used technical analysis scanner that integrates directly with MT4/MT5 and other trading platforms. It offers automated chart pattern recognition, volatility forecasts, economic event analysis, and multi-channel alerts. Many features are broker-provided, though a direct-user subscription exists (pricing not publicly listed). Some premium modules, branded as 'Our Favourites (VIP Tools),' include features like correlating alerts. Autochartist was acquired by oneZero in 2025.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, Mobile, Desktop - 12
Official U.S. Consumer Financial Protection Bureau (CFPB) database of consumer financial complaints. Complaints are published after the company responds or after 15 days (whichever comes first); the database generally updates daily. Narratives are published only with consumer consent and are scrubbed to remove personal information. The dataset includes product/issue taxonomies, company names, location fields (state/ZIP with privacy rules), submission channel, dates, company response categories, timeliness, tags (e.g., servicemember, older adult) and more. UI provides filters, trends, and maps; API returns JSON/CSV/Excel formats for programmatic use.
Category votes onlyPricing: FreePlatforms: Web, API - 13
Official CME probabilities for upcoming FOMC decisions, derived from 30‑Day Fed Funds (ZQ) futures. Web tool provides meeting‑by‑meeting probability matrices, comparisons over time, a historical download, and a Dot Plot view. A paid REST API is available for programmatic access. CME documents the probability‑tree methodology clearly; API snapshots update on business days at ~01:45 UTC. Media usage asks attribution to “CME FedWatch.”
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 14
Diffchecker is a comparison tool for text, images, PDFs, Excel files, and folders. The free Basic plan is web-only, while Pro + Desktop adds offline diffs, ad-free usage, real-time text comparison, and desktop apps. Legal and Enterprise tiers include integrations (e.g. iManage) and advanced admin features. Enterprise also offers SAML SSO, SCIM provisioning, and priority support. An API is available with free and paid plans, and a 14-day trial is offered for Pro/Desktop plans.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, Desktop, API - 15
Official ECB gateway for euro‑area statistics with an open SDMX 2.1 REST API. The new endpoint is https://data-api.ecb.europa.eu/service/ (replacing the legacy SDW path). Content negotiation supports SDMX‑JSON, CSV, and SDMX‑ML. Charts and tables can be downloaded as CSV/XLS (long & wide), and charts as PNG/PDF/PPT. Typical update cadence is daily to monthly (e.g., reference FX rates around 16:00 CET on working days). ECB advises migrating from the old SDW URL as automatic redirects are planned to end on 1 Oct 2025.
Category votes onlyPricing: FreePlatforms: Web, API - 16
Official New York Fed hub for rates, markets operations data, and research indicators. Highlights: reference rates (EFFR, OBFR, SOFR & SOFR Averages/Index), Markets Data Dashboard, SOMA holdings & operations results, Primary Dealer Statistics, GSCPI, SCE microdata, and regional surveys (e.g., Empire State Manufacturing). Markets Data APIs and page-level export tools provide JSON/CSV/XML/Excel programmatic access. Publication times for key rates are stated (e.g., SOFR ~8:00 a.m. ET; EFFR ~9:00 a.m. ET).
Category votes onlyPricing: FreePlatforms: Web, API - 17
An open-source, self-hosted personal finance manager licensed under AGPLv3. Offers full double-entry bookkeeping, REST APIs, and optional event webhooks. Exchange-rate conversion is available from v6.2 onward as an opt-in feature. Bank connections are handled separately through the Firefly Data Importer app.
Category votes onlyPricing: FreePlatforms: Web, API - 18
A global flight-tracking platform offering free web and mobile access to live flight data. Premium subscriptions add unlimited alerts and extended historical lookback. Enterprise offerings include AeroAPI (REST), Firehose (streaming), and Rapid Reports (one-off email deliveries).
Category votes onlyPricing: Free, Subscription, One-timePlatforms: Web, Mobile, API - 19
One of the most trusted sources of macroeconomic and market data worldwide. FRED offers free access to charts, releases, Excel add-ins, and a public API. An API key (free) is required, with standard rate limits. ALFRED, the companion service, provides vintage datasets so you can see what was known at any point in time.
Category votes onlyPricing: FreePlatforms: Web, Mobile, API - 20
An open-source (AGPL-3.0) portfolio and net-worth tracker designed with privacy in mind. You can self-host it for free using Docker or opt for Ghostfolio Premium, a fully managed cloud version (~$40/year). There’s no broker OAuth; data comes in via manual entry, CSV uploads, or API. Runs as a PWA with mobile access and even allows anonymous sign-ups.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, Mobile, API - 21
An email outreach and verification platform with both web and API access. The free plan includes API keys and unlimited team members, though CSV exports are capped (e.g. 10 results per domain) and some Campaigns features like link tracking and reporting are restricted. Campaign webhooks are supported, making it easy to integrate Hunter into wider workflows.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 22
Podcast search engine plus developer Podcast API (search/directory/insights) and purchasable datasets. Free plan allows light testing; PRO is a metered subscription with tiered overages and specific search‑result/rate‑limit allowances; Enterprise relaxes caching/logo rules and increases quotas & SLAs. Listen Alerts monitors 3.6M+ podcasts for keyword mentions with email/RSS and Zapier/IFTTT hooks. Datasets can be exported as CSV/SQLite for analytics, PR/sales, and finance alt‑data use cases. API base URL is https://listen-api.listennotes.com/api/v2 with API‑key auth.
Category votes onlyPricing: Free, Subscription, One-timePlatforms: Web, API, Mobile - 23
Screener and backtesting platform with one-time memberships (6-month, 1-year, or 2-year). A limited free tier is available, but some results and features are gated. Supports near real-time data for U.S. equities, TSX, Forex, and Crypto; other exchanges are delayed by 15 minutes. Intraday periods are available for IEX, Forex, and Crypto only; extended-hours data is not supported. API access for screener data can be requested separately. Discounts are offered for crypto payments.
Category votes onlyPricing: Free, One-timePlatforms: Web - 24
A global market data API with free and paid tiers. End-of-day coverage spans 15+ years and 500k+ tickers, while intraday and real-time access are unlocked on higher plans. Rate limits apply: 5 requests per second globally, with some endpoints (like ETF holdings) counting as multiple calls. Premium tiers add features like SEC/EDGAR filings, analyst ratings, and bond/index data. Data is sourced from Tiingo for U.S. markets, and uptime is tracked on a public status page.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 25
U.S. Treasury’s OFR publishes free, methods‑backed monitors and datasets (Short‑term Funding Monitor, U.S. Money Market Fund Monitor, Bank Systemic Risk Monitor, and the daily OFR Financial Stress Index). STFM and HFM provide open JSON APIs (no keys), CSV downloads are available from some monitors. Updates are end‑of‑day with documented lags (e.g., FSI ~T+2 business days; repo series T+1/T+2 depending on segment).
Category votes onlyPricing: FreePlatforms: Web, API - 26
U.S. federal open‑data program (Affordable Care Act ‘Sunshine Act’) that publishes financial relationships between drug/device manufacturers (and GPOs) and healthcare providers (physicians, NPPs since PY2021, and teaching hospitals). CMS publishes the prior program year’s full datasets on or before June 30 each year and issues a January refresh. Data are accessible via the web search tool, bulk downloads, and a REST Open Data API (filter, query, aggregate).
Category votes onlyPricing: FreePlatforms: Web, API - 27
Open-source data and analytics platform with a REST API, Python SDK, and an enterprise workspace for custom dashboards and apps. The free Community plan includes unlimited dashboards and 20 AI Copilot queries per day. Pro adds collaboration features, Excel integration, secure deployment (VPC/on-prem), and export options. Infrastructure is SOC 2 Type II certified, with SSO support and a public status page.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 28
Primary operator and market data source for U.S. OTC equities via OTC Link ATS/ECN/NQB (SEC‑regulated ATSs). Commercial data products include Real‑Time Level 1+ (inside quote & trades), Level 2+ (full quote book with MPIDs), 15‑minute delayed Level 1+, End‑of‑Day, reference/security master, and compliance datasets (Blue Sky, Promotion/CE, Compliance Analytics). Delivery options include real‑time multicast feeds, SFTP/FTP files, and a REST Disclosure API. Website provides delayed quotes, corporate actions, screeners and issuer news (DNS).
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 29
Portfolio analytics platform with screeners, optimizers, and backtesting. The free tier includes 10 years of data and basic calculations. Plus extends coverage to 40+ years and 200 calculations per month, while Pro unlocks unlimited calculations, 500 holdings per portfolio, CSV import/export, and screener exports. Enterprise offers an API, data-feed integration, and white-labeling. Broker sync is not supported; CSV imports are recommended.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web - 30
QuantConnect runs on the open-source LEAN engine, giving quants and systematic traders a unified workflow from research to backtesting to live deployment. You can run everything locally or in the cloud. Historical data down to tick and second resolution is available on paid tiers, and live-trading notifications scale by plan (from a handful per hour to thousands). Some broker and data feeds—like Trading Technologies futures or premium vendors—are only unlocked at higher tiers.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, Desktop, API - 31
Primary U.S. source for public company, fund, and insider filings. The Full‑Text Search covers filings since 2001 (including exhibits), while the ‘Latest Filings’ view shows near‑real‑time submissions as they are processed. Search tools include Company search, Mutual Fund & Variable Insurance product search, CIK lookup, and RSS subscriptions. Developers can consume JSON via data.sec.gov (Submissions, XBRL Company Facts/Concepts/Frames). Programmatic access must include a descriptive User‑Agent and respect the SEC fair‑access limit (currently 10 requests/sec).
Category votes onlyPricing: FreePlatforms: Web, API - 32
Comprehensive SEO, marketing, and web traffic analytics platform. API access for core Analytics and Projects requires a Business plan, with usage billed in API units. Some APIs—like Listing Management and Map Rank Tracker—don’t consume units. Enterprise security options include SAML SSO on Guru and Business tiers. A 7-day free trial is available for all paid plans.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, Mobile, API - 33
Mobile app and web intelligence platform covering downloads, usage, advertising, and audience trends. A limited free tier is available, while enterprise add-ons include App Teardown and expanded ASO capabilities such as unlimited keyword tracking and custom alerts. Data is delivered via Connect APIs and scheduled feeds with daily refreshes, available in CSV/Parquet and through Snowflake integration.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 34
Global, tax‑aware portfolio tracker with EOD/delayed equity pricing (15–20 min on major markets), automated dividends & corporate actions, contribution analysis, and drawdown risk reporting. Imports from 200+ brokers via file/email and selected direct broker APIs; Xero accounting sync. Crypto & FX update intraday (~5‑min). Business plan for advisers offers per‑portfolio pricing.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, Mobile, API - 35
Digital intelligence platform providing website and app traffic data, engagement benchmarks, and competitive insights. API access is sold separately or bundled with Enterprise plans, and is required for most native integrations (Excel, Sheets, Tableau, Power BI, Salesforce, HubSpot, Snowflake, Databricks). Webhooks support daily and monthly data release notifications. A free DigitalRank API offers basic website ranking data.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 36
Flat-rate market data platform with simple, transparent plans. Tiingo provides end-of-day and real-time APIs for equities, mutual funds, ETFs, forex, and crypto, alongside corporate actions, fundamentals, and news. Plans range from a free Starter tier to affordable paid subscriptions, with usage limits and data history varying by plan. Enterprise or commercial use is supported via higher tiers.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 37
Website & PDF change‑detection for business users (legal, banking, competitive intel). Features include visual diffs in email, partial‑page CSS selection, noise filtering (“Ignore small changes”), hourly/daily/weekly schedules, bulk CSV/Excel import, team workflows, and enterprise‑grade unblocking. An authenticated REST API and change‑notification webhook are available on paid plans/enterprise. Not a finance‑data provider per se; commonly used to watch IR pages, regulators, central banks, fee/terms pages, and other sources relevant to investing workflows. Pricing shows 30‑day trial and a free plan (3 tracks). Enterprise starts “from $229/mo” (annual) with 10 seats; support articles mention up to ~2,000–5,000+ tracks depending on quote. No native broker/data integrations disclosed.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 38
A trading journal and analytics platform designed for active traders. The Free plan supports up to 30 grouped trades per month, while Silver and Gold plans unlock unlimited imports, broker syncing, advanced reporting, and CSV exports. Gold adds deeper features like Exit Analysis, liquidity reports, commissions/fees, and risk reporting in R units.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web - 39
Official U.S. federal spending open‑data portal mandated by the DATA Act and operated by Treasury’s Bureau of the Fiscal Service. The public REST API powers the site (GET/POST endpoints, JSON responses). Data refreshes daily after a nightly pipeline; underlying source systems update on different cadences (e.g., monthly for Files A/B/C via the DATA Act Broker; next‑day for FPDS contracts; FABS within 2 weeks; FSRS subawards by month‑end; GTAS monthly). Bulk downloads and archives are available for awards back to FY2008.
Category votes onlyPricing: FreePlatforms: Web, API - 40
Website change‑detection and alerting. Supports visual, text and element/HTML (‘web’) compare modes, actions to log in/fill forms/scroll/wait/execute scripts, PDF monitoring, high‑frequency checks (as fast as 2 minutes on paid tiers), and multi‑channel notifications (email, SMS, Slack, Microsoft Teams, Google Chat, Discord, RSS, webhooks). Business plans add bulk job import/management, reporting (scheduled), and API/webhooks for integration. AI features (‘Important Alerts’) classify/ summarize changes so teams only see what matters.
Category votes onlyPricing: Free, SubscriptionPlatforms: Web, API - 41
General‑purpose web archiving used widely in financial research to cite and compare historical webpages (IR pages, fund fact sheets, product sites). Save Page Now (SPN2) enables on‑demand snapshots with options like outlink capture and full‑page screenshots. Availability and CDX APIs expose snapshot discovery; Memento provides time‑based negotiation. Rate limits/quotas apply to SPN2; crawling and replay behavior may vary by target site robots/policies. Some large platforms (e.g., Reddit) restrict Wayback access to content.
Category votes onlyPricing: FreePlatforms: Web, API, Mobile - 42
Investing features vary by country. In the UK/EEA, Interest allocates to government money-market funds; in the US, Interest is a bank program with pass-through FDIC insurance (not an investment). “Stocks” is a single BlackRock iShares World Equity Index mutual fund where available. Settlement speed (instant vs non-instant) and whether you invest from Balances or Jars differ by market. Fees are published per currency; Stocks adds a Wise service fee on top of the fund’s OCF.
Category votes onlyPricing: Free, OtherPlatforms: Web, Mobile, API
Ready for the full lineup? Compare all 46 apis & sdks tools, including premium upgrades and advanced tiers.
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About Me
Hey! Thanks for stopping by. I'm an independent investor with a soft spot for coding and the stock market - especially value investing (as you can probably tell from the tools I've collected here, haha). Hopefully you'll find something useful or interesting along the way.
Find me here:
- Twitter / X: @Jera_Value
- Substack: Jera Value
Got questions or suggestions? I'm all ears!
Missing a Tool?
Discovered a gem I don't have here yet? Drop the link below and I'll check it out ASAP. Tagging me on X works too! Can't wait to see what you've found!
Starred Tools
These are my top picks. Tools I've tested thoroughly and found to be excellent. They do their job really well, and I use them a lot. If you're not already familiar with them, I highly recommend checking them out.
Tested Tools
These are tools I've tried and found to be solid, but not standout. Think of them as passing an initial quality screen: worth exploring, though not all will be exceptional.
Curation & Accuracy
This directory blends AI‑assisted discovery with human curation. Entries are reviewed, edited, and organized with the goal of expanding coverage and sharpening quality over time. Your feedback helps steer improvements (because no single human can capture everything all at once).
Details change. Pricing, features, and availability may be incomplete or out of date. Treat listings as a starting point and verify on the provider’s site before making decisions. If you spot an error or a gap, send a quick note and I’ll adjust.