>_ alternatives to Public API

11 trading infrastructure tools that do a similar job to Public API, with the facts side-by-side.

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-asset Trading InfrastructureFREE· earns rebates up to $0.10 per stock & ETF options contract traded via API

Connect Trade— Unified API for trading, market data, and account access across IBKR, Fidelity, Webull, TradeStation and more.
Multi-asset Trading InfrastructureCALL· One API for equities, options, futures across major brokers
[↗] visit connecttrade.com [⇄] Public API vs Connect Trade
Percept— Provides real-time and historical market data APIs with high-performance charting visualization for enterprise applications.
Multi-asset Data & APIs$?· real-time market data APIs with high-performance charting built for scale
[↗] visit percept.one [⇄] Public API vs Percept
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.
Equities Data & APIsFREE-CALL· API designed natively for LLM agents (not human dashboards)
[↗] visit financialdatasets.ai [⇄] Public API vs Financial Datasets
xfinlink— Financial data API service focused on providing structured market and fundamentals data for developers.
Equities Data & APIsFREE-$$· Financial data API access for equities-focused datasets intended for programmatic use.
[↗] visit xfinlink.com [⇄] Public API vs xfinlink
Massive— A data infrastructure platform that provides real-time and historical financial market data through APIs, including stocks, options, crypto, and other trading instruments.
Equities Data & APIsFREE-CALL· LLM-friendly financial data API that exposes real-time and historical market data through simple natural-language.
[↗] visit massive.com [⇄] Public API vs Massive
PreReason— Delivers structured, real-time market data and context optimized for AI agents to analyze and make financial decisions.
Crypto Data & APIs$-CALL· One API call returning structured, AI-ready market context.
[↗] visit prereason.com [⇄] Public API vs PreReason
TagniFi— Provides standardized financial statement data and footnotes across multiple industry templates via API and Excel add-in
Equities Data & APIs$$$-CALL· industry-specific data templates (banking, insurance, C&I) with footnote detail
[↗] visit tagnifi.com [⇄] Public API vs TagniFi
captide— Agentic AI systems grounded on public companies' disclosures that power leading long/short hedge funds and investment banks
Equities Data & APIsCALL· RAG Infrastructure for Corporate Filing Intelligence
[↗] visit captide.ai [⇄] Public API vs captide
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.
Equities Data & APIsFREE· self-hosted pipeline with DSL-based scan/backtest engine over Polygon flat files
[↗] visit kwants.dev [⇄] Public API vs Kwants
MarketAlerts— Builds proprietary datasets, market indicators and KOL distribution — paired with marketing and engineering to take fintech products to escape velocity.
Crypto Data & APIsCALL· From raw data to distribution and product — operates the full pipeline.
[↗] visit marketalerts.com [⇄] Public API vs MarketAlerts
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 analytics
Crypto Data & APIsFREE-$$$· normalizes data from 20+ crypto exchanges and Polymarket into single schema
[↗] visit kiyotaka.ai [⇄] Public API vs Kiyotaka

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