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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.

S&P 500 Constituents API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
85 ms
Server probes · 24h
Subscribers
3,458
active
Total calls
95
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.

Sector Rotation RRG (Relative Rotation Graph) API — oanor API marketplace

Sector Rotation RRG (Relative Rotation Graph) API

Where each S&P 500 sector sits on the rotation map versus the market, computed live from Yahoo Finance (no key, nothing stored). The Relative Rotation Graph is how professional allocators visualise sector rotation: it plots each sector on two axes — relative strength (is it out- or under-performing the S&P 500) and relative momentum (is that relative strength improving or fading) — and the combination lands each sector in one of four quadrants that rotate clockwise over time: Leading (strong and getting stronger), Weakening (strong but losing steam), Lagging (weak and getting weaker) and Improving (weak but turning up). Money rotates Improving to Leading to Weakening to Lagging, so the quadrant tells you not just who is winning but who is next. This computes each of the eleven SPDR sectors' RS-Ratio and RS-Momentum against the S&P 500 and places it in its quadrant. The rrg endpoint returns the whole rotation map; the sector endpoint returns one sector's coordinates and quadrant; the sectors endpoint lists what is covered. The sector-rotation RRG / quadrant cut — distinct from the relative-strength ranking (a one-dimensional list), the sector price/performance feed and the correlation APIs. It shows the rotation, not just the ranking.

api.oanor.com/rrg-api

 Relative Strength vs S&P 500 API — oanor API marketplace

Relative Strength vs S&P 500 API

Which markets are beating the benchmark and which are lagging, ranked, computed live from Yahoo Finance (no key, nothing stored). Relative strength is the engine of rotation: money flows toward what is outperforming, and the leaders of one quarter often lead the next. For a cross-asset, cross-sector universe — the eleven S&P 500 sectors plus small caps, international and emerging equities, gold, oil, commodities, bonds and crypto — this measures each asset's return MINUS the S&P 500's over one, three and six months, blends them into a relative-strength score, and ranks the whole board into leaders and laggards. A positive score means the asset is beating the market; a negative one means it is lagging. The ranking endpoint returns that ranked board with the benchmark's own return and the standout leaders and laggards. The asset endpoint returns one market's relative strength across each window, its beta to the S&P 500 and whether its relative strength is improving or fading. The universe endpoint lists what is covered. The relative-strength / market-leadership rotation cut — distinct from the absolute-momentum, the sector-correlation and the altcoin-season APIs. It answers what is leading the market, measured against it.

api.oanor.com/relativestrength-api

 Stock Sector Correlation Matrix API — oanor API marketplace

Stock Sector Correlation Matrix API

How the eleven S&P 500 sectors move together, computed live from Yahoo Finance via the SPDR sector ETFs (no key, nothing stored). Sector correlation is the heart of equity diversification and rotation: defensives (utilities, staples, health care) and cyclicals (tech, discretionary, financials, energy) cluster differently, and when correlations rise the whole market is moving as one (risk-on/risk-off), while a spread of correlations means stock-picking and rotation are rewarded. The matrix endpoint returns the full pairwise return-correlation matrix across all eleven sectors with the most- and least-correlated sector pairs. The sector endpoint returns one sector's correlation to every other, ranked, plus its beta to the S&P 500 (how much it amplifies the market). The sectors endpoint lists what is covered. The equity sector correlation / rotation cut — distinct from the cross-asset correlation matrix (asset classes, not sectors), the crypto and currency correlation APIs (other markets) and the sector price/performance feed. It answers which sectors are the same bet and which diversify, within the stock market.

api.oanor.com/sectorcorrelation-api

 Stock Index Seasonality API — oanor API marketplace

Stock Index Seasonality API

The calendar patterns equity traders position around — "Sell in May", the Santa Claus rally, the September swoon — computed live from ~10 years of Yahoo Finance monthly data across the world's major stock indices (no key, nothing stored). Equities have well-documented seasonal tendencies, and this measures them directly: for each index it takes a decade of monthly returns, groups them by calendar month, and returns the average return in each of the twelve months, the share of years that month was positive (the win rate), and the historically strongest and weakest months. The seasonality endpoint returns one index's full 12-month seasonal profile plus the current month's historical bias. The month endpoint flips it around: for a calendar month it ranks every index by its historical average return, so you can see which markets are seasonally strong or weak right now. The indices endpoint lists what is covered, from the S&P 500, Nasdaq, Dow and Russell to the DAX, FTSE, CAC, Euro Stoxx, Nikkei and Hang Seng. The equity-index seasonality / calendar-pattern cut — distinct from the FX, commodity and crypto seasonality APIs, the index price feed and the constituent APIs.

api.oanor.com/indexseasonality-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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