Connect Massive to Claude via MCP: News and Prices

💡 No install? Use cloud.anythingmcp.com directly. Sign in, click Connectors → Massive, paste your credentials, mint an MCP API key and you're done. No Docker, no git clone, no local server.

Massive + Claude

Market data from Massive: US stock, option, index, forex and crypto price bars, trades, quotes and snapshots, ticker details, news with sentiment, financial statements and ratios, dividends, splits, technical indicators, market status, treasury yields and inflation. Read-only; needs an API key, and a free Basic plan is available.

Prerequisites

See the full setup instructions baked into the connector (visible in the in-app store when you select the connector). The required environment variables for this connector are:

MASSIVE_API_KEY

Step 1 — Get credentials

Setting up takes about 2 minutes. You need a Massive API key. Massive is the former Polygon.io, renamed in October 2025, and keys created there keep working.

1. Sign up at https://massive.com; the free Basic plan needs no card.
2. Open Dashboard > API Keys (https://massive.com/dashboard/keys) and copy the key.
3. Paste it into MASSIVE_API_KEY. It is sent as Authorization: Bearer to https://api.massive.com.
4. Install the connector and run massive_get_market_status: it shows whether the US markets, forex and crypto are open right now and confirms the key.

What your plan allows (for stocks; options, indices and currencies have their own plans):

• Basic (free): 5 requests per minute, end-of-day data, 2 years of history: aggregates, previous close, daily open and close, reference data, news, dividends, splits, technical indicators, market status, treasury yields and inflation.
• Starter: unlimited requests, 15-minute delayed data, 5 years, plus snapshots and gainers and losers.
• Developer: adds trades and 10 years.
• Advanced: real-time data, full history, quotes, and financial statements and ratios (also available through the Financials expansion). The options chain and option snapshots need an Options Starter plan or higher.
• A call outside your plan answers 403 NOT_AUTHORIZED with a message naming the plan; the AI tells you instead of retrying.

Tickers: stocks are plain (AAPL, BRK.B); options look like O:AAPL271217C00250000 (underlying, expiry YYMMDD, C or P, strike times 1000 in 8 digits); forex C:EURUSD, crypto X:BTCUSD, indices I:SPX. For an unknown symbol the AI searches with massive_list_tickers.

What it reads:

• Market status and upcoming US market holidays and early closes per exchange.
• Price bars of any size, from seconds to years, for stocks, options, forex, crypto and indices; the previous day's bar; one day's open and close with pre-market and after-hours prices.
• Live data: snapshots of one stock or of up to 250 tickers of any asset class, the day's top 20 gainers and losers, last trade and last quote. Tick data: individual trades and NBBO quotes for a day or a time range.
• Reference data: ticker search by name, type, market, exchange, CIK or CUSIP; ticker details with description, market cap, shares outstanding, employees, SIC code and logo; related companies; ticker types and exchanges.
• News with title, publisher, tickers mentioned and per-ticker sentiment with reasoning.
• Financials from SEC filings: quarterly, annual and trailing-twelve-month income statements, balance sheets and cash flow statements, and current ratios such as P/E, EV/EBITDA, ROE or debt to equity, which also work as a stock screener (for example market_cap_gte, price_to_earnings_lte, sort market_cap.desc).
• Dividends and splits, past and declared.
• Options: contracts by underlying, type, expiration and strike, the chain with prices, greeks, implied volatility and open interest, and the snapshot of one contract.
• Forex and crypto: currency conversion at the latest rate, last forex quote, last crypto trade.
• SMA, EMA, RSI and MACD for any ticker, plus US treasury yields from 1 month to 30 years and monthly CPI and PCE inflation from the Federal Reserve.

Data formats: bars use short keys: o open, h high, l low, c close, v volume, vw volume-weighted average price, n number of trades, and t the start of the bar as a Unix timestamp in milliseconds (UTC). Trades and quotes carry nanosecond timestamps (sip_timestamp). Prices are in the quote currency; financial statement values are in full units of the reporting currency. Exchanges are numeric ids, listed by massive_list_exchanges.

Paging: lists return next_url when more results exist. For tickers, trades, quotes, news, snapshots and options, the AI passes the value after cursor= in next_url as cursor. For financials, dividends, splits and the economy lists, it narrows the date range or raises limit instead.

Read-only: every tool only reads, so there is nothing to confirm and no tool is switched off at install.

Common errors: 401 means a missing or unknown key ("Unknown API Key"). 403 means the key works but your plan does not include the data (see https://massive.com/pricing). 429 means too many requests; on Basic that is 5 per minute, so wait a minute. An empty results with status OK means there is no data for the range, for example on a holiday.

The connector does not use WebSocket streams, flat files, futures, Benzinga partner data or SEC filing texts. Massive also runs an official MCP server at https://mcp.massive.com.

Step 2 — Install the adapter

curl -fsSL https://raw.githubusercontent.com/HelpCode-ai/anythingmcp/main/docker-compose.quickstart.yml -o docker-compose.yml
printf 'JWT_SECRET=%s\nENCRYPTION_KEY=%s\n' "$(openssl rand -hex 32)" "$(openssl rand -hex 32)" > .env
docker compose up -d

Step 3 — Add the connector in Claude

Your server URL: in AnythingMCP, open MCP Servers → the server this connector is on, and copy its URL (https://cloud.anythingmcp.com/mcp/…). Use it wherever this guide shows YOUR_SERVER_ID.

Recommended path: works on claude.ai web without editing any config file.

1. In Claude, open Customize → Connectors.
2. Click +, then Add custom connector.
3. Enter a name, e.g. Massive, and the remote MCP server URL https://cloud.anythingmcp.com/mcp/YOUR_SERVER_ID, then click Add.
4. Click Connect and sign in to AnythingMCP (OAuth) to allow access.

All tools below appear in your chat: start typing prompts.

Available tools

Example prompts

• "Show the daily bars of AAPL for the last three months and point out the biggest single-day moves."
• "Is the US stock market open right now, and when is the next market holiday?"
• "What do the latest news articles say about Tesla, and what is the sentiment for each ticker mentioned?"
• "Compare the dividend history of Coca-Cola and PepsiCo over the last two years."
• "How have the 2-year and 10-year US Treasury yields moved this year?"

FAQ

Does it work with Claude Code as well as Claude Desktop? Yes, point both at https://cloud.anythingmcp.com/mcp/YOUR_SERVER_ID.

Next steps

• Connector landing page
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