Massive (Polygon.io)

Real-time market data, OHLCV bars, options chains with Greeks, technical indicators, news, and reference data via the Massive API.

Massive (formerly Polygon.io) provides real-time and historical market data across stocks, options, crypto, and forex — including OHLCV aggregates, options chains with full Greeks, technical indicators, and financial news.

Setup

1. Get an API key

   Sign up at massive.com/pricing and get your key from the dashboard.

2. Set environment variable

   export MASSIVE_API_KEY="your-api-key"
   
3. Start using

   from horizon.providers import MassiveProvider as M
   
   snap = M.snapshot("AAPL")
   

Massive is the rebrand of Polygon.io (October 2025). The API is identical — same endpoints, same keys. Both api.massive.com and api.polygon.io work. Horizon uses api.massive.com by default.

Snapshots

Real-time price snapshot with day OHLCV, previous close, last trade, and last quote.

Python

from horizon.providers import MassiveProvider as M

snap = M.snapshot("AAPL")
# snap["todaysChange"], snap["day"]["c"], snap["lastTrade"]["p"]

CLI

horizon providers massive snapshot AAPL

OHLCV Bars

Historical and intraday aggregates at any resolution.

Python

# Daily bars
bars = M.aggregates("AAPL", 1, "day", "2024-01-01", "2024-06-30")

# 5-minute bars
bars = M.aggregates("AAPL", 5, "minute", "2024-06-01", "2024-06-01")

# Previous close
prev = M.previous_close("TSLA")

CLI

# Daily bars
horizon providers massive bars AAPL --from 2024-01-01 --to 2024-06-30

# 5-minute bars
horizon providers massive bars AAPL --from 2024-06-01 --to 2024-06-01 --timespan minute --multiplier 5

Timespan options: second, minute, hour, day, week, month, quarter, year

Each bar contains:

Field	Description
o	Open price
h	High price
l	Low price
c	Close price
v	Volume
vw	Volume-weighted average price
t	Timestamp (Unix ms)
n	Number of transactions

Top Movers

Get the top 20 gainers or losers across the market.

Python

gainers = M.gainers_losers("gainers")
losers = M.gainers_losers("losers")

CLI

horizon providers massive movers --direction gainers
horizon providers massive movers --direction losers

Last Trade & Quote

Most recent trade and NBBO quote for a ticker.

Python

trade = M.last_trade("NVDA")
quote = M.last_quote("NVDA")

CLI

horizon providers massive quote NVDA

Options Chain

Full options chain with Greeks (delta, gamma, theta, vega) and implied volatility.

Python

# Full chain
chain = M.options_chain("AAPL")

# Filtered: calls expiring June 2024, strikes $150-$200
chain = M.options_chain(
    "AAPL",
    contract_type="call",
    expiration_date="2024-06-21",
    strike_price_gte=150,
    strike_price_lte=200,
)

CLI

horizon providers massive options AAPL --type call --expiry 2024-06-21 --strike-gte 150 --strike-lte 200

Each contract includes:

Field	Description
break_even_price	Break-even price
open_interest	Open interest
implied_volatility	Implied volatility
greeks.delta	Delta
greeks.gamma	Gamma
greeks.theta	Theta
greeks.vega	Vega
last_quote	Bid/ask
day	Day OHLCV

Technical Indicators

Built-in technical indicator calculations.

Python

# Simple Moving Average
sma = M.sma("AAPL", window=200)

# Exponential Moving Average
ema = M.ema("AAPL", window=50)

# RSI
rsi = M.rsi("TSLA", window=14)

# MACD
macd = M.macd("AAPL")

CLI

horizon providers massive sma AAPL --window 200
horizon providers massive rsi TSLA --window 14
horizon providers massive macd AAPL

Indicator parameters:

Parameter	Description	Default
timespan	second/minute/hour/day/week/month	day
window	Lookback period	50 (SMA/EMA), 14 (RSI)
series_type	open/high/low/close	close
limit	Number of values	50

Ticker Details & Search

Look up company information or search for tickers.

Python

# Full details
details = M.ticker_details("NVDA")
# details["name"], details["market_cap"], details["description"]

# Search
results = M.search_tickers("apple", market="stocks")

CLI

horizon providers massive details NVDA
horizon providers massive search "apple" --market stocks

News

Financial news with sentiment analysis and ticker tagging.

Python

# General market news
news = M.news(limit=10)

# Ticker-specific
aapl_news = M.news(ticker="AAPL", limit=5)

CLI

horizon providers massive news --ticker AAPL --limit 5

Each article includes title, description, article_url, published_utc, tickers, and insights with sentiment analysis.

Corporate Actions

Dividends and stock splits.

divs = M.dividends("AAPL")
splits = M.splits("TSLA")

horizon providers massive dividends AAPL

Crypto

Crypto market data using X:BTCUSD format.

Python

btc = M.crypto_snapshot("X:BTCUSD")

# Crypto movers
gainers = M.crypto_gainers_losers("gainers")

# OHLCV bars (same aggregates function)
bars = M.aggregates("X:BTCUSD", 1, "day", "2024-01-01", "2024-06-30")

CLI

horizon providers massive crypto X:BTCUSD

Forex

Real-time forex conversions and snapshots. Pairs use C:EURUSD format.

Python

rate = M.forex_conversion("EUR", "USD")
snap = M.forex_snapshot("C:EURUSD")

CLI

horizon providers massive forex EUR USD

Market Status

Check if markets are currently open.

status = M.market_status()
holidays = M.market_holidays()

horizon providers massive status

Rate Limits

Tier	REST Limit	Data
Free	5 req/min	Delayed (15 min)
Paid	Unlimited	Real-time

Paid plans are recommended for trading use. Stay under 100 req/sec.

MCP Tools

All functions are available via the market_data compound MCP tool with an action parameter:

// Example: get AAPL snapshot
{"action": "snapshot", "params": "{\"ticker\": \"AAPL\"}"}

Available actions: aggregates, snapshot, last_trade, last_quote, previous_close, grouped_daily, gainers_losers, crypto_gainers_losers, ticker_details, search_tickers, market_status, market_holidays, sma, ema, rsi, macd, options_chain, options_contracts, news, dividends, splits, crypto_snapshot, forex_conversion, forex_snapshot.