Migration Guides
Each guide maps one vendor's API to Massive. It shows how requests, responses, symbols, and prices change, and links each vendor call to the Massive page that replaces it. Each guide starts with a prompt you can give a coding agent to do the port for you.
To compare Massive with your current provider before you switch, see the comparison hub.
Pick your current provider
Market data API for stocks, options, and crypto.
Function-based REST API for stocks, forex, crypto, and indicators.
Normalized exchange feeds with order book data.
End-of-day and fundamentals data for global exchanges.
Stocks, fundamentals, and alternative data API.
Financial data marketplace with stock prices and fundamentals.
End-of-day prices, IEX intraday, news, and fundamentals.
Time series API for stocks, forex, crypto, and indicators.
Open source Python library that reads Yahoo Finance.
Before you start
- Sign up and copy your API key from the dashboard.
- Pick a plan for each market you use on the pricing page. Your key can read each market that your plan includes.
- Read the REST quickstart for auth and response shape. To let an agent call Massive while it works, set up the MCP server.