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Stock and portfolio monitoring

Build stock watchlists, historical price charts, and portfolio-monitoring features with price and company data. Add the market information your users need to an existing application or a dedicated investing product.

API documentationPlans and pricing

Recommended APIs

Start with the endpoints your feature needs. Each API includes documentation and sample requests.

Stock Price
Current quotes and historical open, high, low, close, and volume data.
Ticker
Company metadata to help identify securities in your interface.
ETF
ETF data for products that include exchange-traded funds.
Exchange Rate
Currency conversion inputs for portfolios spanning currencies.
Earnings Calendar
Company earnings events to add context to a watchlist.

Integration workflow

Help users follow the securities they care about with prices, historical context, and clear update times.

  1. Resolve your watchlist

    Match your users’ securities to supported ticker symbols. Use company metadata to display readable names and exchange information, and keep your application’s holdings and quantities associated with those identifiers.

  2. Retrieve prices and history

    Fetch the current quote for each symbol and request historical OHLCV data at the interval your charts need. Schedule refreshes around market hours and the needs of your product.

  3. Calculate and display portfolio context

    Combine prices with the positions held in your own application to calculate values and changes. Show currency and price timestamps, and distinguish a missing quote from a zero value.

Example workflow

Input
A watchlist of stock symbols
API data
Stock prices + price history + company metadata
Product output
A portfolio dashboard with price context

Example request

Start with a stock quote

Read price, currency, and updated from the response. For charts, use the stockpricehistorical endpoint and select the documented period, start, and end parameters.

curl --request GET \ 'https://api.api-ninjas.com/v1/stockprice?ticker=AAPL' \ --header 'X-Api-Key: YOUR_API_KEY'

Replace YOUR_API_KEY with your API key. See the endpoint documentation for parameters and response fields.

Production considerations

Make price freshness visible

Paid plans provide live stock prices during market hours; the free plan returns the last completed session’s closing price. Use the returned updated timestamp, which represents the price update rather than the time of your request.

Budget for the refresh pattern

Estimate requests from the symbols monitored and refresh frequency. Match refresh intervals to market hours and how often your users need updated prices.

Define what your calculations include

Portfolio accounting belongs in your application. Decide how to handle currencies, market sessions, splits, dividends, and incomplete historical bars before describing a chart as an investment return.

Plans and usage

A low-volume integration can use Developer. Estimate usage from the number of symbols and refresh intervals. Historical stock prices are available on paid plans; the full archive has additional plan requirements described in the API documentation.

Use the free plan to evaluate supported endpoints. API and historical-data access vary by plan.

Compare plans

Frequently asked questions

Does this connect to brokerage accounts or place trades?
These APIs supply market and reference data. Your application manages user portfolios, brokerage connections, alerts, and any order-execution integration separately.
Can I build price charts with historical data?
Yes. The Stock Price API includes a historical endpoint that returns OHLCV data. The latest five years are available on paid plans; access further back requires Business, Professional, Enterprise, or an annual subscription, as described in the endpoint documentation.
Will every refresh return a new price?
No. Prices may be unchanged, and markets may be closed. Check the updated field and preserve the last known timestamp in your interface instead of implying that each successful request represents a new market event.

Related resources

Other use cases