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API · /sp500-api

S&P 500 Constituents API

healthy 3,458 Subscribers

The current members of the S&P 500 stock index as an API — the reference a stock screener, portfolio tool or research dashboard needs. For each of the ~500 constituents: its ticker symbol, the company name, its GICS sector and sub-industry, the headquarters location, the date it was added to the index, its SEC Central Index Key (CIK, ready for EDGAR look-ups) and the year it was founded. Look a constituent up by symbol or name, list every company in a GICS sector, search across symbols, names, sub-industries and headquarters, or list the whole index with a per-sector breakdown. This is the index-membership and sector-classification reference — not live prices (finance-api), SEC filings (edgar-api) or the global legal-entity register (companies-api). Served from memory — always fast.

#sp500 #stocks #gics #equities #finance #index
api.oanor.com/sp500-api
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Machine-readable spec so AI agents can integrate this API.

/api/sp500-api/openapi.json
/api/sp500-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
96 ms
Server probes · 24h
Subscribers
3,458
active
Total calls
40
last 7 days
status Full status page → · 15 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 15,000 calls / month
  • 3 requests / second
  • Hard cap (429 above quota, no overage)
  • 15k calls/month
  • 3 req/sec
  • All endpoints
  • No credit card
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Starter

€9.00 /month

  • 180,000 calls / month
  • 10 requests / second
  • Hard cap (429 above quota, no overage)
  • 180k calls/month
  • 10 req/sec
  • Email support
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Pro

€27.00 /month

  • 900,000 calls / month
  • 25 requests / second
  • Hard cap (429 above quota, no overage)
  • 900k calls/month
  • 25 req/sec
  • Priority support
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Mega

€65.00 /month

  • 4,500,000 calls / month
  • 60 requests / second
  • Hard cap (429 above quota, no overage)
  • 4.5M calls/month
  • 60 req/sec
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

Index & Treasury Futures API

Live financial futures as an API — front-month prices for the major US index and Treasury futures, served from Yahoo Finance. For any contract it returns the current price, the previous close, the absolute and percentage change on the day, the day's high and low, the 52-week high and low, the contract month and the currency. Index futures (E-mini S&P 500, Nasdaq-100, Dow, Russell 2000) trade nearly around the clock and are the market's go-to read on where the open is heading; Treasury futures (2-, 5-, 10- and 30-year notes and bonds) track interest-rate expectations. Look a contract up by name or ticker alias, pull a category board (index or rates) ranked by the day's move, or get the whole board in one call. The futures-quote layer for trading, pre-market and dashboard apps. Live, no key, no cache. Distinct from spot index APIs and from the physical-commodity futures API — this is financial (index and rate) futures.

api.oanor.com/futures-api

World Stock Indices API

Live world stock-index levels as an API — the current level of the major stock-market indices, served from Yahoo Finance. For any index it returns the current level, the previous close, the absolute and percentage change on the day, the day's high and low, and the 52-week high and low, in the index's own currency. Look an index up by name or ticker alias (S&P 500, Nasdaq, Dow, FTSE 100, DAX, CAC 40, Euro Stoxx 50, Nikkei 225, Hang Seng, Sensex, ASX 200 and more), pull a regional board ranked by the day's move (US, Europe, Asia, Americas), or get the headline world board in a single call. The live index-quote layer for trading, markets and dashboard apps. Distinct from S&P 500 and Nasdaq constituent-directory APIs — this returns the live index level, not the member list.

api.oanor.com/indices-api

IPO Calendar API

The live pipeline of US stock-market initial public offerings, served from Nasdaq's public IPO calendar — no key, nothing cached. This is the deal flow of companies going public, the data IPO investors and traders watch. The priced endpoint returns the IPOs that have just priced and begun trading, each with the ticker, company, exchange, offer price, shares offered, pricing date and total deal size. The upcoming endpoint returns the IPOs expected to price soon, with their price range and expected date — the near-term pipeline. The filed endpoint returns companies that have newly filed to go public, the earliest signal of a coming listing. The calendar endpoint returns the whole month in one call — priced, upcoming and filed — with counts. Any month back through the archive can be requested, and with no month it returns the current one. Everything is live from Nasdaq, nothing stored. This is the IPO-pipeline layer for any trading, investing, screener or finance app. Distinct from stock-quote and earnings APIs — this is the calendar of companies coming to market: priced, upcoming and freshly filed offerings. 4 endpoints, no key on our side.

api.oanor.com/ipo-api

Market Calendar API

Live corporate-events calendar for US-listed stocks — the dates that move markets — served straight from Nasdaq's public calendar feed. For any trading day it answers the three questions a trader's calendar needs. The earnings endpoint lists every company reporting on a date with the session (pre-market or after-hours), the consensus EPS forecast, the number of analyst estimates, market cap and the year-ago actual EPS — so you can see, for example, Oracle reporting after the close with a $1.58 consensus against $1.35 a year earlier. The dividends endpoint gives the dividend calendar: the ex-dividend, record and payment dates, the per-share rate and the indicated annual dividend. The splits endpoint gives the stock-split calendar with the split ratio and execution date. This is the forward event-calendar layer every trading, portfolio, screener, earnings-tracker and finance app needs — read live from Nasdaq, nothing cached or stored. Pass any date as YYYY-MM-DD, or omit it for today. Distinct from price, quote and fundamentals APIs — this is the forward calendar of corporate events: who reports, who pays, who splits, and when. 4 endpoints.

api.oanor.com/marketcalendar-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for S&P 500 Constituents API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call S&P 500 Constituents API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for S&P 500 Constituents API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does S&P 500 Constituents API cost?
S&P 500 Constituents API has a free tier with 100 calls / month. Paid plans start at €9.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is S&P 500 Constituents API GDPR-compliant?
All requests to S&P 500 Constituents API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/sp500-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/sp500-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/sp500-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/sp500-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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