What is a good yfinance alternative?

For US market data in production, Massive: a supported API with exchange data, a free plan, and paid plans from $29/mo per market. yfinance is still fine for learning and personal projects.

Why does yfinance return 429 Too Many Requests?

Yahoo rate-limits its endpoints at its own discretion and does not publish the limits. The yfinance repo has 16 issues titled Too Many Requests. Massive paid plans have no call limit.

Can I use yfinance commercially?

The yfinance code is Apache-licensed, but the data comes from Yahoo. Its README says the Yahoo Finance API is for personal use only, and Yahoo's API terms bar using its APIs to earn income without Yahoo's prior written permission.

How much intraday history does yfinance have?

1-minute bars for the last 30 days, 2 to 90-minute bars for 60 days, and hourly bars for 730 days. Massive has 20+ years of intraday data.

Where did Adj Close go in yfinance?

Since version 0.2.51, download() adjusts prices by default, so Close is already adjusted and Adj Close is gone. Pass auto_adjust=False to get it back.

Compare/Massive vs yfinance

Updated October 2026

Massive vs yfinance

Massive is a supported API with exchange data, US stock trades back to 2003, a free plan, and Business plans licensed for commercial use. If you only need data for learning or personal projects, yfinance covers that for free, with no key.

Get your free API key See pricing →

Massive leads on

Commercial use
Stability
Unlimited usage
Intraday history
Tick data
Support
Options
Streaming
SDKs

yfinance leads on

Non-US stocks
Free financials

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 yfinance

yfinance is a free, open-source Python library that pulls market data from Yahoo Finance. Its README says it is not affiliated with, endorsed, or vetted by Yahoo, and is meant for research and education.

Choose Massive if

You run anything in production, or sell a product built on the data.
You need a license to use the data commercially.
You need data that does not break when a website changes.
You need more than 60 days of intraday history, or every trade and quote.

Choose yfinance if

You are learning, or exploring data for yourself.
You want global tickers and fundamentals for free.

Yahoo can change or shut off its APIs at any time, and bars commercial use without permission.

Feature by feature

Massive vs yfinance, feature by feature
Feature	Massive	yfinance
Price	Free plan. Paid plans from $29/mo per market	yfinance leads: Free, with no key or signup^[1]
Commercial use	Massive leads: Self-serve Business plans: Currencies $999/mo, Options $1,999/mo, Stocks $2,499/mo	Yahoo's API terms bar using its APIs to earn income without Yahoo's written permission^[2]
Stability	Massive leads: Versioned API	Yahoo can change, suspend, or discontinue its APIs at any time. The library broke in January 2023, July 2023, and May 2025^[2]^[8]^[9]^[10]
Rate limits	Massive leads: Published. Unlimited calls on every paid plan	Set by Yahoo at its discretion. 16 GitHub issues are titled Too Many Requests^[2]^[6]
Intraday history	Massive leads: 20+ years, with trades and quotes back to 2003	1-minute bars for the last 30 days, 8 days per request. 2 to 90-minute bars for 60 days, hourly for 730 days^[4]^[3]
Tick data	Massive leads: Every trade and NBBO quote, with nanosecond timestamps	Not available^[1]
Support	Massive leads: Massive, with documentation and a support team	Open-source volunteers. Not affiliated with or vetted by Yahoo^[1]
Options	Massive leads: All US options (OPRA). Real-time on Options Advanced, $199/mo	Current option chains. No historical options endpoint^[1]
Streaming	Massive leads: WebSockets on every paid plan	WebSocket class since version 0.2.59. Yahoo lists options and some indices as 15-minute delayed^[1]^[11]
SDKs	Massive leads: Python, JavaScript, Go, and Kotlin/JVM, which also works from Java	Python only^[1]
Non-US stocks	US markets only (forex and crypto are global)	yfinance leads: Global tickers^[1]
Free financials	Financials and ratios on Stocks Advanced or a $29/mo add-on. SEC filings, insider trades, 13-F holdings, short interest, and economic data on every Stocks plan, including the free one. Analyst estimates, Benzinga news ($99/mo), and ETF holdings as add-ons	yfinance leads: Financials, balance sheets, and calendars, for free^[1]

Where they differ

What unofficial means

yfinance calls Yahoo Finance endpoints that Yahoo does not document or support. Its README says it is not affiliated with, endorsed, or vetted by Yahoo, and is meant for research and education. Under its API terms, Yahoo can change, suspend, or discontinue its APIs at any time. When Yahoo changes those endpoints, the library breaks until volunteers patch it: decryption failures in January 2023, 401 errors in July 2023, bad crumb errors in May 2025.

Rate limits you cannot see

Yahoo sets rate limits at its discretion and does not publish them. In November 2024, a user pulling 7,000 tickers a day was cut off at about 950. The yfinance repo has 16 issues titled Too Many Requests. Massive publishes its limits, and paid plans have no call limit.

Commercial use

Yahoo's API terms bar using the APIs to earn income without Yahoo's prior written permission. The Apache license on yfinance covers the code, not the data. Massive Business plans license the data for commercial use, with prices on the pricing page.

Where yfinance is enough

For a class, personal research, or a weekend backtest on daily bars, yfinance is free and quick. Global tickers and fundamentals come back as pandas DataFrames, with no signup.

Pricing

Prices in USD per month, from each vendor's public pricing pages on October 24, 2026. Check yfinance's site before you buy.

Price examples, Massive vs yfinance
What you need	Massive	yfinance
Daily US stock bars for research	Free plan: end-of-day data, 2 years of history	Free^[1]
Real-time US stocks in an app you sell	$199/mo (Stocks Advanced), 100% of US volume	Needs written permission from Yahoo^[2]
Show data to your customers	Stocks Business $2,499/mo, self-serve	Needs written permission from Yahoo^[2]

Moving from yfinance

Example: daily AAPL bars for January 2024

yfinance^[3]^[1]Python

import yfinance as yf

df = yf.Ticker("AAPL").history(start="2024-01-02", end="2024-02-01")

MassivePython

from massive import RESTClient

client = RESTClient("YOUR_API_KEY")
bars = list(client.list_aggs("AAPL", 1, "day", "2024-01-02", "2024-01-31"))

Bar fields

Daily bar fields, yfinance and Massive
Field	yfinance	Massive
Timestamp	`Date index (America/New_York)`	`t (Unix milliseconds, bar start)`
Open	`Open`	`o`
High	`High`	`h`
Low	`Low`	`l`
Close	`Close (adjusted for splits and dividends by default)`	`c`
Volume	`Volume`	`v`
VWAP	`None`	`vw`
Trade count	`None`	`n`

yfinance end dates are exclusive, so January ends at 2024-02-01. Massive end dates are inclusive.
yfinance adjusts Close for splits and dividends by default. Massive adjusts for splits unless you set adjusted=false.
Massive returns a list of bars. pandas.DataFrame(bars) turns it into the DataFrame your yfinance code expects.

Switch with an agent

Paste this into Claude Code, Cursor, Codex, or any coding agent. It finds your yfinance calls and ports them to Massive.

Find every place my project calls yfinance. 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

What is a good yfinance alternative?: For US market data in production, Massive: a supported API with exchange data, a free plan, and paid plans from $29/mo per market. yfinance is still fine for learning and personal projects.
Why does yfinance return 429 Too Many Requests?: Yahoo rate-limits its endpoints at its own discretion and does not publish the limits. The yfinance repo has 16 issues titled Too Many Requests. Massive paid plans have no call limit.
Can I use yfinance commercially?: The yfinance code is Apache-licensed, but the data comes from Yahoo. Its README says the Yahoo Finance API is for personal use only, and Yahoo's API terms bar using its APIs to earn income without Yahoo's prior written permission.
How much intraday history does yfinance have?: 1-minute bars for the last 30 days, 2 to 90-minute bars for 60 days, and hourly bars for 730 days. Massive has 20+ years of intraday data.
Where did Adj Close go in yfinance?: Since version 0.2.51, download() adjusts prices by default, so Close is already adjusted and Adj Close is gone. Pass auto_adjust=False to get it back.

Sources

yfinance details come from yfinance's own public pages, checked on October 24, 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 yfinance's site. Massive wrote this page. If something is wrong, tell us and we will fix it. yfinance is a trademark of its owner, and Massive is not affiliated with yfinance.

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