>_ 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
| tool | best for | pricing | who uses it |
|---|---|---|---|
| Public API (this tool) | earns rebates up to $0.10 per stock & ETF options contract traded via API | FREE | — |
| 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 | Hedge Fund, RIA, Mutual Fund, Investment Bank |
| xfinlink | developers building research pipelines, backtesting systems, or quant workflows requiring programmatic access to cleaned us equity fundamentals and pricing. | FREE-$$ | Retail, RIA, Hedge Fund, Mutual Fund, Investment Bank |
| Massive | developers and firms building applications that require live market data feeds or historical datasets for backtesting and analysis. | FREE-CALL | Hedge Fund, Mutual Fund, Investment Bank |
| PreReason | ai agents and developers building financial analysis workflows with programmatic access to structured, analysis-ready bitcoin and macro context. | $-CALL | Retail, RIA, Family Office, Hedge Fund, Mutual Fund, Investment Bank |
| TagniFi | users needing structured sec data mapped to industry-specific accounting frameworks | $$$-CALL | RIA, Hedge Fund, Mutual Fund, Family Office |
| captide | long/short hedge funds and investment banks performing equity research on public companies | CALL | Hedge Fund, Investment Bank |
| Kwants | developers and quants who want to self-host a complete us equity backtest pipeline on polygon data. | FREE | — |
| 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-$$$ | Retail |
- Connect Trade— Unified API for trading, market data, and account access across IBKR, Fidelity, Webull, TradeStation and more.
- Percept— Provides real-time and historical market data APIs with high-performance charting visualization for enterprise applications.
- Financial Datasets— Stock-market data API built for AI agents — financials, SEC filings, KPIs, insider trades, and analyst estimates across 17,000+ tickers and 30+ years of history.
- xfinlink— Financial data API service focused on providing structured market and fundamentals data for developers.EquitiesData & APIsFREE-$$· 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