Massive vs Twelve Data
Massive goes deep on US markets: real-time data from 100% of US stock volume, 20+ years of intraday history, options, and futures. If you only need stocks or funds from markets outside the US, Twelve Data covers that.
Massive leads on
- Price
- Real-time stocks
- Intraday history
- Options and futures
- Bulk downloads
Twelve Data leads on
- Non-US stocks
- Funds and bonds
What is Massive
Massive is a market data API for US stocks, options, indices, and futures, plus forex and crypto. It delivers data over REST, WebSockets, S3 flat files, and an MCP server.
What is Twelve Data
Twelve Data is a market data API for stocks, ETFs, funds, forex, crypto, and bonds across 50+ countries, with plans priced by API credits.
Choose Massive if
- You need real-time US data from every exchange.
- You backtest on intraday data from before December 2022.
- You need US options or futures.
- You want unlimited calls, not a credit budget.
Choose Twelve Data if
- You need stocks, ETFs, or mutual funds from many countries.
- You need real-time European data.
- You want fixed income data in the same API.
- Your team works in Excel or Google Sheets.
Feature by feature
| Feature | Massive | Twelve Data |
|---|---|---|
| Price | Massive leads: $29, $79, or $199/mo per market, with unlimited API calls on every paid plan | Credits per minute. Grow $79/mo, Pro $229/mo, Ultra $999/mo, or from $29, $99, and $329 at the lowest credit levels. Some endpoints cost more credits per request[1][3] |
| Free plan | Free plan per market: end-of-day data, 2 years of history, 5 calls/min | 8 credits/min, 800/day, 3 markets, internal use only[1] |
| Real-time stocks | Massive leads: 100% of US market volume on Stocks Advanced, $199/mo | Default feed comes from venues with about 5% of US volume. Full-market data is an add-on with no published price[4] |
| Intraday history | Massive leads: 20+ years, with trades and quotes back to 2003 | Since December 15, 2022. Daily bars since 1980[5] |
| Options and futures | Massive leads: US options and CME, CBOT, NYMEX, and COMEX futures | Not listed[3] |
| Non-US stocks | US markets only (forex and crypto are global) | Twelve Data leads: Up to 85 markets, with real-time Cboe Europe data[1] |
| Funds and bonds | ETF data through ETF Global add-ons. No mutual funds or bonds | Twelve Data leads: ETFs, mutual funds, and fixed income[1] |
| Bulk downloads | Massive leads: S3-compatible flat files on every paid plan | No flat files. A batch endpoint pulls large requests asynchronously[3] |
| SDKs | Python, JavaScript, Go, and Kotlin/JVM, which also works from Java | Python, Node.js, Go, Java, R, a CLI, and spreadsheet add-ons[3] |
| AI agents | Official MCP server at mcp.massive.com | Hosted MCP server at mcp.twelvedata.com[3] |
| Commercial price | Self-serve Business plans: Currencies $999/mo, Options $1,999/mo, Stocks $2,499/mo | Twelve Data leads: Self-serve business plans: Venture $499/mo with external display, Enterprise $1,099/mo with external distribution[2] |
Where they differ
What real-time US data covers
The default Twelve Data US feed comes from venues that need no extra exchange license. Twelve Data puts that at about 5% of US volume. Prices from 5% of the tape can drift from the full market. Massive Stocks Advanced covers all of it.
Intraday history
Twelve Data intraday US bars start on December 15, 2022. Massive has 20+ years, so your intraday backtests can include 2008 and March 2020.
Outside the US
For stocks listed outside the US, Twelve Data may be the better choice: up to 85 stock markets, real-time European data, mutual funds, and bonds. Massive covers US stocks, options, indices, and futures, plus global forex and crypto.
Pricing
Prices in USD per month, from each vendor's public pricing pages on October 23, 2026. Check Twelve Data's site before you buy.
| What you need | Massive | Twelve Data |
|---|---|---|
| Real-time US stocks, personal use | $199/mo (Stocks Advanced), 100% of US volume | Free on every plan, from venues with about 5% of US volume. Full-market data is an add-on with no published price[1][4] |
| Commercial display in your product | Stocks Business $2,499/mo, self-serve | Venture $499/mo, or from $149/mo at the lowest credit level[2] |
Moving from Twelve Data
Example: daily AAPL bars for January 2024
curl "https://api.twelvedata.com/time_series?symbol=AAPL&interval=1day&start_date=2024-01-02&end_date=2024-02-01" \
-H "Authorization: apikey YOUR_API_KEY"curl "https://api.massive.com/v2/aggs/ticker/AAPL/range/1/day/2024-01-02/2024-01-31" \
-H "Authorization: Bearer YOUR_API_KEY"Bar fields
| Field | Twelve Data | Massive |
|---|---|---|
| Timestamp | datetime ("YYYY-MM-DD", exchange time) | t (Unix milliseconds, bar start) |
| Open | open (string) | o |
| High | high (string) | h |
| Low | low (string) | l |
| Close | close (string) | c |
| Volume | volume (string) | v |
| VWAP | None | vw |
| Trade count | None | n |
- Twelve Data end_date is exclusive in practice, so January ends at 2024-02-01. Massive end dates are inclusive.
- Twelve Data returns values as strings, newest first by default. Massive returns numbers, oldest first.
- Twelve Data charges credits per request, and the cost changes by endpoint. Massive paid plans have no per-request cost, so you can remove credit tracking from your code.
Switch with an agent
Paste this into Claude Code, Cursor, Codex, or any coding agent. It finds your Twelve Data calls and ports them to Massive.
Find every place my project calls Twelve Data. Switch those calls to the Massive REST API. Read https://massive.com/docs/llms.txt for endpoints and auth, and read the API key from the MASSIVE_API_KEY environment variable. Keep my function signatures and data shapes the same, and list anything Massive does not cover.
The ported code calls the REST API directly. The Massive MCP server is optional, for checking real responses while the agent works. Massive also publishes skills and plugins for coding agents.
Questions
- Massive vs Twelve Data: which is better?
- For US markets, Massive: 100% of stock volume in real time, 20+ years of intraday history, options, and futures. If you also need stocks listed outside the US, Twelve Data covers up to 85 markets, plus funds and bonds.
- Is Twelve Data free?
- Yes. Basic is free: 8 credits a minute, 800 a day, 3 markets, internal use only.
- How do Twelve Data API credits work?
- Every request costs credits, and some endpoints cost more than others. Your plan sets a budget per minute.
- Does Twelve Data have real-time US stock data?
- Yes, on every plan. The default feed covers about 5% of US volume, by Twelve Data's own count. Full-market data is an add-on with no published price.
Sources
Twelve Data details come from Twelve Data's own public pages, checked on October 23, 2026, and may have changed since. Massive details come from the Massive plans API on October 22, 2026. "Not listed" means we did not find it on Twelve Data's site. Massive wrote this page. If something is wrong, tell us and we will fix it. Twelve Data is a trademark of its owner, and Massive is not affiliated with Twelve Data.
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