Collectors · Finance & crypto

Stock Data API in Python

Live quote + history for stocks, ETFs and indices — price, volume, day and 52-week range. One POST from Python with symbols, rows back as JSON with 20 fields, $0.001 per delivered quote. No proxies or parsers to maintain.

Get an API key See the collector

A Python requests snippet that posts { — A Python requests call to the yahoo_finance collector returns one dict per quote, at $0.001 each.

First call

Install, call, read the rows.

pip install requests

The only dependency.

import os, requests

r = requests.post(
    "https://api.quanticdata.io/v1/scraper/collectors/yahoo_finance/run",
    headers={"Authorization": f"Bearer {os.environ['QD_API_KEY']}"},
    json={
        "symbols": ["AAPL","MSFT","NVDA"],
        "max_results": 3,
    },
    timeout=120,
)
r.raise_for_status()
run = r.json()["payload"]
print(run["count"], "rows,", run["cost"]["usd"], "USD")
for row in run["results"]:
    print(row.get("symbol"), row.get("name"), row.get("price"), row.get("currency"))

Python: one Yahoo Finance market data run (Tre azioni), printing symbol, name, price, currency

The key comes from an environment variable, never from the code. The run answers in the same request when it finishes in time; payload.results holds the rows and payload.cost what they cost.

Request parameters

What the collector takes.

Input of the Yahoo Finance market data collector
Parameter	Type	Required	Meaning
`symbols`	array	yes	Ticker symbols, e.g. AAPL, MSFT, ^GSPC, EURUSD=X.
`range`	string: `1d`, `5d`, `1mo`, `3mo`, `6mo`, `1y`, `2y`, `5y`, `10y`, `ytd`, `max`	no (default 1mo)	History range when include_history is on.
`interval`	string: `1m`, `5m`, `15m`, `1h`, `1d`, `1wk`, `1mo`	no (default 1d)	History candle interval.
`include_history`	boolean	no (default false)	Attach the OHLCV series (last 120 points) to each row.
`max_results`	integer	no (default 10)	How many symbols to deliver at most (1–50). You pay only for delivered symbols.

Response fields

20 fields per quote.

Fields of each row (quote)
Field	Type	What it holds
`symbol`	string	Ticker symbol.
`name`	string, nullable	Instrument name.
`price`	number, nullable	Current price.
`currency`	string, nullable	Price currency.
`exchange`	string, nullable	Exchange.
`instrument_type`	string, nullable	EQUITY, ETF, INDEX, CURRENCY…
`previous_close`	number, nullable	Previous close.
`day_high`	number, nullable	Session high.
`day_low`	number, nullable	Session low.
`fifty_two_week_high`	number, nullable	52-week high.
`fifty_two_week_low`	number, nullable	52-week low.
`volume`	integer, nullable	Regular-market volume.
`market_time`	string, nullable	Quote timestamp (ISO 8601).
`timezone`	string, nullable	Exchange timezone.
`range`	string, nullable	History range returned.
`history`	object[]	OHLCV points ({ date, open, high, low, close, volume }); empty unless include_history.
`change`	number, nullable	Price minus previous_close.
`change_percent`	number, nullable	Change against previous_close, in percent.
`first_trade_date`	string, nullable	First trading day of the instrument (YYYY-MM-DD).
`url`	string	Yahoo Finance quote page.

Add ?format=csv to the runs endpoint to get the same rows as CSV.

Long runs

Run in the background, then poll.

A run that needs more time can go to the background: send "async": true, get 202 with the run id, and poll the runs endpoint until the status is done. Reading a run is free.

import os, time, requests

H = {"Authorization": f"Bearer {os.environ['QD_API_KEY']}"}
r = requests.post("https://api.quanticdata.io/v1/scraper/collectors/yahoo_finance/run", headers=H,
                  json={**{"symbols":["AAPL","MSFT","NVDA"],"max_results":3}, "async": True}, timeout=30)
run_id = r.json()["payload"]["run_id"]
while True:
    run = requests.get(f"https://api.quanticdata.io/v1/scraper/collectors/runs/{run_id}", headers=H, timeout=30).json()["payload"]
    if run["status"] in ("done", "failed"):
        break
    time.sleep(5)
print(run["status"], run["count"])

Python: background run and polling

Errors

What can come back, and what is billed.

Collector run errors
Status	Meaning	Billed
`400`	The input does not match the collector (`payload.errors`)	No
`401`	Missing or wrong API key	No
`402`	Balance and free credit do not cover the run: top up	No
`422`	The input can never resolve; retrying the same input cannot help	No
`424`	The run failed at the source (blocked, timed out, layout changed); safe to retry	No
`429`	Rate limit or a per-account brake; wait for `Retry-After`	No

Only delivered rows are billed: a run that delivers nothing costs nothing.

Price

$0.001 per delivered quote.

What Yahoo Finance market data rows cost at list price
Rows	Cost
1	$0.001
1,000	$1.00
10,000	$10.00

Up to 50 quotes per run; split larger jobs into several runs. The $2 free credit every month covers about 2,000 quotes. No subscription; paid tiers lower the unit price. All collector prices: collector pricing.

Before you run it

Questions developers ask

Is there a free Yahoo Finance market data API?

Every account gets $2 of free usage each month, about 2,000 quotes of this collector at $0.001 each, with no card.

Do I have to handle proxies, retries or blocks?

No. The collector runs on our network and handles them; a run blocked at the source returns 424 and is not billed.

How many rows can one run return?

Up to 50 quotes per run (the max_results input, where the collector has one).

Can an AI agent run it?

Yes: the MCP server exposes it as the run_collector tool, with the same input and price. See the MCP server.

Run it on the free credit.

Create an API key, export it as QD_API_KEY and run the example. $0.001 per delivered quote, no subscription.

Get an API key Stock Data API