>_ alternatives to Public API
11 trading infrastructure tools that do a similar job to Public API, with the facts side-by-side.
See full data, pricing and features on the Public API profile page.
the tool you're replacing
Public API— Provides programmatic trading access to stocks, ETFs, options, crypto, and bonds with real-time execution, rebates on options contracts, and no commissions.
Multi-assetTrading InfrastructureFREE· earns rebates up to $0.10 per stock & ETF options contract traded via API
trading api offering programmatic access to stocks, etfs, options (including multi-leg), bonds, and crypto with real-time execution, no commissions, and rebates up to $0.10 per stock & etf options contract. provides read access (balances, positions, order history) and write access (place trades, set custom order parameters, access historical market data). available to all public members instantly via account settings—no approval required.
| tool | best for | pricing | plans | who uses it |
|---|---|---|---|---|
| Public API (this tool) | developers, algorithmic traders, and quantitative analysts automating trading strategies or building custom tools that require low-latency access and high customization. | FREE free tier | API Access $0 | Retail |
| Connect Trade | fintech platforms integrating multi-broker trading and account connectivity for their end users | CALL | — | — |
| Percept | real-time market data APIs with high-performance charting built for scale | $? | — | — |
| Financial Datasets | ai financial agents, quantitative research platforms, portfolio management systems, and event-driven trading infrastructure | FREE-CALL free tier | Credits $20 one-time · Developer $200/mo · Pro $2,000/mo · Enterprise contact us | Hedge Fund, RIA, Mutual Fund, Investment Bank |
| xfinlink | developers and researchers building factor backtests, screening systems, or equity analysis pipelines who need survivorship-bias-free data and standardized field names. | FREE-$$ free tier | — | — |
| Massive | developers and firms building applications that require live market data feeds or historical datasets for backtesting and analysis. | FREE-CALL free tier | Free Tier instant access | Hedge Fund, Mutual Fund, Investment Bank |
| PreReason | ai agents and developers building financial analysis workflows with programmatic access to structured, analysis-ready bitcoin and macro context. | $-CALL free tier | Free $0/month · Basic $19.99/month ($15.99/month annual) · Pro $49.99/month ($39.99/month annual) · Enterprise Custom pricing | Retail, RIA, Family Office, Hedge Fund, Mutual Fund, Investment Bank |
| TagniFi | users needing structured sec data mapped to industry-specific accounting frameworks | $$$-CALL | — | RIA, Hedge Fund, Mutual Fund, Family Office |
| captide | powering research workflows at long/short hedge funds and investment banks that need programmatic access to structured filings and ai-driven document intelligence | CALL | — | Hedge Fund, Investment Bank |
| Kwants | developers and quants who want a local, file-based pipeline for us equity backtesting against polygon data. | FREE free tier | — | Retail |
| MarketAlerts | crypto-focused firms seeking proprietary data for research and product development. | CALL | — | Hedge Fund |
| Kiyotaka | crypto traders analyzing order flow, liquidations, and cross-exchange data alongside polymarket prediction market positions. | FREE-$$$ free tier | — | Retail |
free alternatives to Public API
- Financial Datasets — ai financial agents, quantitative research platforms, portfolio management systems, and event-driven trading infrastructure · Credits $20 one-time · Developer $200/mo · Pro $2,000/mo · Enterprise contact us
- xfinlink — developers and researchers building factor backtests, screening systems, or equity analysis pipelines who need survivorship-bias-free data and standardized field names.
- Massive — developers and firms building applications that require live market data feeds or historical datasets for backtesting and analysis. · Free Tier instant access
- PreReason — ai agents and developers building financial analysis workflows with programmatic access to structured, analysis-ready bitcoin and macro context. · Free $0/month · Basic $19.99/month ($15.99/month annual) · Pro $49.99/month ($39.99/month annual) · Enterprise Custom pricing
- Kwants — developers and quants who want a local, file-based pipeline for us equity backtesting against polygon data.
- Kiyotaka — crypto traders analyzing order flow, liquidations, and cross-exchange data alongside polymarket prediction market positions.
open-source alternatives to Public API
- Kwants — developers and quants who want a local, file-based pipeline for us equity backtesting against polygon data.
Public API alternatives for other asset classes
- Financial Datasets (Equities) — ai financial agents, quantitative research platforms, portfolio management systems, and event-driven trading infrastructure · Credits $20 one-time · Developer $200/mo · Pro $2,000/mo · Enterprise contact us
- xfinlink (Equities) — developers and researchers building factor backtests, screening systems, or equity analysis pipelines who need survivorship-bias-free data and standardized field names.
- Massive (Equities) — developers and firms building applications that require live market data feeds or historical datasets for backtesting and analysis. · Free Tier instant access
- PreReason (Crypto) — ai agents and developers building financial analysis workflows with programmatic access to structured, analysis-ready bitcoin and macro context. · Free $0/month · Basic $19.99/month ($15.99/month annual) · Pro $49.99/month ($39.99/month annual) · Enterprise Custom pricing
- TagniFi (Equities) — users needing structured sec data mapped to industry-specific accounting frameworks
- captide (Equities) — powering research workflows at long/short hedge funds and investment banks that need programmatic access to structured filings and ai-driven document intelligence
- Kwants (Equities) — developers and quants who want a local, file-based pipeline for us equity backtesting against polygon data.
- MarketAlerts (Crypto) — crypto-focused firms seeking proprietary data for research and product development.
- Kiyotaka (Crypto) — crypto traders analyzing order flow, liquidations, and cross-exchange data alongside polymarket prediction market positions.
- Connect Trade— Unified API for trading, market data, and account access across IBKR, Fidelity, Webull, TradeStation and more.
- Percept— Provides real-time and historical market data APIs with high-performance charting visualization for enterprise applications.
- Financial Datasets— Stock-market data API built for AI agents — financials, SEC filings, KPIs, insider trades, and analyst estimates across 17,000+ tickers and 30+ years of history.
- xfinlink— Financial data API service focused on providing structured market and fundamentals data for developers.EquitiesData & APIsFREE-$$· Financial data API access for equities-focused datasets intended for programmatic use.
- Massive— A data infrastructure platform that provides real-time and historical financial market data through APIs, including stocks, options, crypto, and other trading instruments.EquitiesData & APIsFREE-CALL· LLM-friendly financial data API that exposes real-time and historical market data through simple natural-language.
- PreReason— Delivers structured, real-time market data and context optimized for AI agents to analyze and make financial decisions.
- TagniFi— Provides standardized financial statement data and footnotes across multiple industry templates via API and Excel add-inEquitiesData & APIs$$$-CALL· industry-specific data templates (banking, insurance, C&I) with footnote detail
- captide— Agentic AI systems grounded on public companies' disclosures that power leading long/short hedge funds and investment banks
- Kwants— Provides a self-hosted Python library for downloading Polygon flat-file data, building point-in-time ticker universes with adjustments, and running backtests against 1m/5m/daily bars using a declarative DSL for entry/exit conditions.EquitiesData & APIsFREE· self-hosted pipeline with DSL-based scan/backtest engine over Polygon flat files
- MarketAlerts— Builds proprietary datasets, market indicators and KOL distribution — paired with marketing and engineering to take fintech products to escape velocity.
- Kiyotaka— Provides unified REST and WebSocket API for crypto market data across 20+ exchanges and Polymarket prediction markets with normalized OHLCV, orderbook depth, liquidations, TPO, and trader analyticsCryptoData & APIsFREE-$$$· normalizes data from 20+ crypto exchanges and Polymarket into single schema