Migrate from Alpha Vantage

Port Alpha Vantage calls to the Massive API

This guide is for developers who call the Alpha Vantage query API and want to run the same app on Massive. It maps each common function to the Massive endpoint that replaces it, and lists the differences that change your results. To compare the two products before you switch, see Massive vs Alpha Vantage.

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.
Read the REST quickstart for the response shape that every endpoint shares.

Using AI?

Paste this into Claude Code, Cursor, Codex, or any coding agent that can read files and fetch a URL:

Find every place my project calls Alpha Vantage.
Switch those calls to the Massive REST API.
Read https://massive.com/docs/migration/guides/alpha-vantage.md for the endpoint map and the differences to handle.
Read https://massive.com/docs/llms.txt for the rest of the API.
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.

To let the agent check real responses while it works, connect the Massive MCP server. Massive also publishes skills and plugins for coding agents.

The request

Alpha Vantage has one URL, and the function parameter picks the data. Massive has one path per data type, and the key goes in a header.

Alpha Vantage returns the latest 100 days by default. outputsize=full returns all history, and needs a premium key. You filter the dates in code:

curl "https://www.alphavantage.co/query?function=TIME_SERIES_DAILY&symbol=AAPL&outputsize=full&apikey=YOUR_API_KEY"

Massive takes the date range in the path. Both dates are inclusive:

Massive

curl "https://api.massive.com/v2/aggs/ticker/AAPL/range/1/day/2025-10-01/2025-10-03?adjusted=false" \
  -H "Authorization: Bearer YOUR_API_KEY"

from massive import RESTClient

client = RESTClient("YOUR_API_KEY")
bars = list(client.list_aggs("AAPL", 1, "day", "2025-10-01", "2025-10-03", adjusted=False))

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/massive-com/client-go/v3/rest"
	"github.com/massive-com/client-go/v3/rest/gen"
)

func main() {
	c := rest.NewWithOptions("YOUR_API_KEY", rest.WithPagination(true))
	ctx := context.Background()

	params := &gen.GetStocksAggregatesParams{
		Adjusted: rest.Ptr(false),
		Sort:     "asc",
	}

	resp, err := c.GetStocksAggregatesWithResponse(ctx, "AAPL", 1, "day", "2025-10-01", "2025-10-03", params)
	if err != nil {
		log.Fatal(err)
	}
	if err := rest.CheckResponse(resp); err != nil {
		log.Fatal(err)
	}

	iter := rest.NewIteratorFromResponse(c, resp)
	for iter.Next() {
		fmt.Printf("%+v\n", iter.Item())
	}
	if err := iter.Err(); err != nil {
		log.Fatal(err)
	}
}

import { restClient } from '@massive.com/client-js';

const rest = restClient('YOUR_API_KEY', 'https://api.massive.com');

const response = await rest.getStocksAggregates({
  stocksTicker: "AAPL",
  multiplier: "1",
  timespan: "day",
  from: "2025-10-01",
  to: "2025-10-03",
  adjusted: "false"
});

import com.massive.client.apis.DefaultApi
import com.massive.client.apis.DefaultApi.TimespanGetStocksAggregates
import com.massive.client.infrastructure.*

fun main() {
    ApiClient.apiKey["apiKey"] = "YOUR_API_KEY"

    val bars = DefaultApi().getStocksAggregates(
        stocksTicker = "AAPL",
        multiplier = 1,
        timespan = TimespanGetStocksAggregates.day,
        from = "2025-10-01",
        to = "2025-10-03",
        adjusted = false
    )
    println(bars)
}

Long ranges. Alpha Vantage intraday history comes one month per call. Massive returns a next_url when there is more data. The Python client follows it for you.
Rate limits. Paid Massive plans have no per-minute limit, so you can remove throttling and retry loops.

The response

Alpha Vantage returns an object keyed by date, with every value as a string:

{
  "Time Series (Daily)": {
    "2025-10-01": {
      "1. open": "255.0400",
      "2. high": "258.7900",
      "3. low": "254.9300",
      "4. close": "255.4500",
      "5. volume": "48713940"
    }
  }
}

Massive returns a list of bars, with numbers:

{
  "results": [
    {
      "t": 1759291200000,
      "o": 255.04,
      "h": 258.79,
      "l": 254.93,
      "c": 255.45,
      "v": 48713940,
      "vw": 256.004,
      "n": 535581
    }
  ]
}

Alpha Vantage	Massive	Note
Date key, such as "2025-10-01"	t	Unix milliseconds at the bar start. Daily bars start at midnight ET
"1. open"	o
"2. high"	h
"3. low"	l
"4. close"	c
"5. volume"	v
None	vw	Volume-weighted average price
None	n	Number of trades

Remove any float() or parseFloat calls on the values. To get the date back, convert t from Unix milliseconds to US/Eastern.

Symbols

Stock tickers stay the same. Forex, crypto, and options become one ticker with a prefix.

Alpha Vantage	Massive
symbol=AAPL	AAPL
from_symbol=EUR&to_symbol=USD	C:EURUSD
symbol=BTC&market=USD	X:BTCUSD
IBM270115C00390000	O:IBM270115C00390000
INDEX_DATA with symbol=SPX	I:SPX
TSCO.LON	Not covered. Massive stocks are US listings only

Prices

The two APIs adjust prices differently, so check this before you compare numbers.

TIME_SERIES_DAILY returns prices as traded. Set adjusted=false on Massive to match.
TIME_SERIES_DAILY_ADJUSTED adjusts for splits and dividends. Massive adjusts for splits only. To rebuild dividend-adjusted prices, use the historical adjustment factor from Dividends.
TIME_SERIES_INTRADAY adjusts for splits and dividends. Massive adjusts for splits only, so intraday prices near a dividend will not match.
Both include pre-market and after-hours trades in minute bars.

Errors

Alpha Vantage returns HTTP 200 for most errors, with the message in an Information key. Massive returns an HTTP 4xx status. Check the status code, not the body.

Sources: Alpha Vantage documentation, Alpha Vantage premium plans.

Endpoint map

This map covers the most common calls. It is not a full list. To find the Massive endpoint for another call, search these docs.

Alpha Vantage function	Massive endpoint
TIME_SERIES_DAILY, TIME_SERIES_DAILY_ADJUSTED	Custom Bars with timespan=day
TIME_SERIES_WEEKLY, TIME_SERIES_MONTHLY	Custom Bars with timespan=week or month
TIME_SERIES_INTRADAY	Custom Bars with timespan=minute
GLOBAL_QUOTE	Single Ticker Snapshot
REALTIME_BULK_QUOTES	Full Market Snapshot, or Unified Snapshot for a list of tickers
SYMBOL_SEARCH	All Tickers with search
LISTING_STATUS	All Tickers with date and active=false
OVERVIEW	Ticker Overview and Ratios
INCOME_STATEMENT, BALANCE_SHEET, CASH_FLOW	Income Statements, Balance Sheets, Cash Flow Statements
EARNINGS, EARNINGS_CALENDAR	Benzinga Earnings, a paid add-on
INSIDER_TRANSACTIONS	Form 4
IPO_CALENDAR	IPOs
DIVIDENDS, SPLITS	Dividends, Splits
NEWS_SENTIMENT	News
SMA, EMA, RSI, MACD	SMA, EMA, RSI, MACD. Compute other indicators from bars
REALTIME_OPTIONS	Option Chain Snapshot
HISTORICAL_OPTIONS	Options Custom Bars, Trades, Quotes
FX_DAILY, FX_INTRADAY	Forex Custom Bars
CURRENCY_EXCHANGE_RATE	Currency Conversion. Set precision, which defaults to 2 decimal places
DIGITAL_CURRENCY_DAILY, CRYPTO_INTRADAY	Crypto Custom Bars
INDEX_DATA	Indices Custom Bars
MARKET_STATUS	Market Status
TOP_GAINERS_LOSERS	Top Market Movers
TREASURY_YIELD, CPI, INFLATION	Treasury Yields, Inflation
UNEMPLOYMENT, NONFARM_PAYROLL	Labor Market

Massive currently doesn't have an equivalent for Alpha Vantage commodity prices, non-US listings, or indicators other than SMA, EMA, RSI, and MACD. New data and features ship often, so check the product roadmap for what's planned.

Streaming

Alpha Vantage has no streaming API, so apps poll GLOBAL_QUOTE or intraday series. On Massive, replace the polling loop with a WebSocket subscription. Connect to wss://socket.massive.com/stocks, authenticate, and subscribe to trades, quotes, or minute bars. See the WebSocket quickstart.

Bulk history

Alpha Vantage has no bulk download. If you loop over symbols with outputsize=full to build a local history, use flat files instead. Each file holds one day of daily bars, minute bars, or trades for every US stock.

SDKs

Alpha Vantage has no official client library. Its docs give code samples and link to community wrappers. Massive has official clients for Python, JavaScript, Go, and Kotlin/JVM. The Python client follows next_url for you.

Sources

Alpha Vantage details were checked against the Alpha Vantage documentation and premium plans page on October 29, 2026. Alpha Vantage is a trademark of its owner. Massive is not affiliated with Alpha Vantage.