Polygon

Name: Polygon API
Brand: Polygon Market Data API
Availability: InStock

✓ Official Vendor SpecFinanceBankingapiKey10 EndpointsREST

For Agents

Access real-time and historical market data for stocks, forex, and cryptocurrencies including prices, trades, and corporate actions.

Install Jentic One Beta

Connect the Polygon to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Polygon, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.

Step 1: Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh

Step 2: Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with Polygon API.

Retrieve historical aggregated price bars at minute, hour, day, or custom intervals

Access real-time last trade and quote snapshots for any ticker symbol

Query historical trade and quote time series for backtesting strategies

GET STARTED

Start building with Polygon API

Explore with Jentic

View OpenAPI Document

Polygon.io provides real-time and historical financial market data covering stocks, options, forex, and cryptocurrencies. The API delivers aggregated price bars, tick-level quotes, trade data, and corporate actions information used by quantitative traders, fintech applications, and investment research platforms. Traders use it to build backtesting systems, implement algorithmic trading strategies, and power real-time market dashboards. The API offers granular data including minute-by-minute price aggregates, last trade snapshots, and historical quote time series. It provides both REST endpoints for historical data retrieval and WebSocket streams for live market feeds. Polygon.io emphasizes data quality with normalized symbology across asset classes and extensive historical coverage for longitudinal analysis. Financial applications integrate it for portfolio valuation, risk analytics, and market surveillance workflows.

Use Cases

Patterns agents use Polygon API for, with concrete tasks.

★ Algorithmic Trading Strategy Development

Quantitative traders use Polygon.io to backtest trading strategies against years of historical market data. The API's aggregated bars endpoints provide OHLCV (Open, High, Low, Close, Volume) data at various timeframes from 1-minute to daily bars. Traders download historical data, calculate technical indicators like moving averages and RSI, simulate order execution, and measure strategy performance metrics. After validation, they deploy live strategies using real-time quote streams to generate entry/exit signals. The API's consistent data quality and symbology enable robust backtesting that accurately reflects live trading conditions.

Query Polygon.io for daily OHLCV data for S&P 500 stocks over past 5 years, load into backtesting framework, calculate technical indicators, simulate trading signals, measure returns and drawdowns, export performance metrics.

Real-Time Portfolio Valuation and Risk Monitoring

Investment platforms and robo-advisors use Polygon.io for real-time portfolio valuation and risk analytics. The last trade endpoints provide current market prices for all portfolio holdings, enabling mark-to-market calculations every minute. Risk systems subscribe to WebSocket price feeds to monitor portfolio volatility, calculate Value-at-Risk (VaR), and trigger alerts when positions exceed concentration limits. Portfolio performance dashboards display live P&L, sector exposures, and attribution analysis powered by Polygon's continuously updated price data.

Subscribe to Polygon WebSocket for real-time price updates on portfolio tickers, calculate portfolio market value as prices change, compute intraday P&L, monitor position concentration, trigger alert if single position exceeds 10% of portfolio value.

Fintech Application Market Data Integration

Consumer fintech apps like Robinhood, Acorns, and personal finance tools integrate Polygon.io to display stock prices, historical charts, and market statistics. The API powers stock quote pages showing last trade price, day's range, and volume, plus interactive charts with minute-level granularity. Apps query the companies endpoint to enrich ticker symbols with company names and descriptions. Polygon's normalized data format simplifies integration across stocks, forex, and crypto, enabling apps to offer multi-asset portfolios with consistent data schemas.

Query Polygon for last trade price and day statistics for user's watchlist tickers, render price cards in mobile UI, fetch 1-day minute bars for sparkline charts, enable tap-through to full chart with historical data.

Investment Research and Quantitative Analysis

Hedge funds and research analysts use Polygon.io to conduct large-scale quantitative studies identifying alpha factors and market inefficiencies. Researchers download years of tick data for liquidity analysis, study bid-ask spreads across market conditions, and analyze order flow patterns. The API's historical forex data enables currency risk studies and carry trade optimization. Analysts combine Polygon pricing data with alternative datasets (sentiment, fundamentals) to build predictive models for equity returns, testing hypotheses across thousands of securities.

Download historical quote data for Russell 3000 stocks, calculate bid-ask spreads at different volume levels, analyze liquidity patterns pre/post earnings, identify stocks with predictable spread compression, build trading signals exploiting liquidity cycles.

Key Endpoints

10 endpoints — polygon.

METHOD

PATH

DESCRIPTION

GET

/v1/historic/agg/{size}/{symbol}/{date}

Get aggregated price bars for a symbol on a specific date

GET

/v1/historic/quotes/{symbol}/{date}

Get historical quote data for a symbol

GET

/v1/historic/forex/{from}/{to}/{date}

Get historical forex rates for a currency pair

GET

/v1/companies

List available companies and tickers

GET

/v1/currencies

List available currency pairs

GET

/v1/historic/agg/{size}/{symbol}/{date}

Get aggregated price bars for a symbol on a specific date

GET

/v1/historic/quotes/{symbol}/{date}

Get historical quote data for a symbol

GET

/v1/historic/forex/{from}/{to}/{date}

Get historical forex rates for a currency pair

GET

/v1/companies

List available companies and tickers

GET

/v1/currencies

List available currency pairs

Why Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

Your Polygon API key is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.

Intent-based discovery

Agents search Jentic by intent such as 'get historical stock prices' or 'look up a currency pair', and Jentic returns the matching Polygon operation with its input schema for symbol, date, and timeframe so the agent calls the right endpoint without browsing the reference docs.

Time to first call

FAQs

Specific to using Polygon API through Jentic.

What authentication does the Polygon.io API use?

The Polygon.io API uses API key authentication passed as a query parameter (apiKey) in REST requests or in the connection URL for WebSocket streams. You obtain an API key by creating an account on polygon.io.

What asset classes does Polygon.io cover?

Polygon.io provides market data for US stocks (including OTC), stock options, forex currency pairs, and cryptocurrencies. Coverage includes real-time and historical data with extensive lookback periods for backtesting and research.

How granular is the historical data available?

Polygon offers historical data at multiple granularities: tick-level trades and quotes (millisecond precision), 1-minute aggregated bars, hourly bars, and daily bars. Backtesting systems typically use 1-minute or daily bars depending on strategy timeframe.

Does Polygon.io offer real-time data streams?

Yes, Polygon provides WebSocket streams for real-time trades, quotes, and aggregated bars. Paid plans include real-time data, while free tiers have 15-minute delayed data. Check polygon.io pricing for real-time access.

How do AI agents use the Polygon.io API through Jentic?

Agents search Jentic for tasks like 'get historical stock prices for Apple' and receive Polygon operation schemas. Jentic securely stores API keys, handles authentication, and allows agents to query market data, retrieve price histories, and analyze financial datasets with natural language parameters.

Can I limit what my agent is allowed to do with the Polygon Market Data API?

Yes. Because you run Jentic One yourself, your own rules decide which Polygon operations your agent may call, so you can allow only the read lookups you want, such as historic aggregate bars, quotes, or forex rates, and withhold the rest. Every Polygon operation is a read-only market-data lookup that takes the ticker symbol and date in the URL path, so nothing your agent runs can write, trade, or move money on your behalf. Your Polygon API key stays with your instance and is added at execution time, never exposed to the agent, so the agent can only reach the endpoints you have permitted.