9 Free Endpoints I Built Into a Financial Data API — With Curl/Python Examples
I've been building XFINLAB, a financial intelligence API — market events, sentiment, technical analysis, macro data — with an MCP server for AI agents on top. Along the way I also built a handful of free, no-key tools directly into the site.
Sharing the actual working requests here, labeled honestly by which ones you should actually build on vs which are just free site plumbing:
🔑 Official Intelligence API — versioned, X-API-Key auth, documented, part of the paid product. Safe to build a production integration on.
🌐 Free website tool, no key — powers a public page on xfinlab.com directly. No auth, no versioning guarantee, no SLA. Fine for personal scripts, quick lookups, or prototyping — not recommended for anything you depend on staying stable, since it can change without notice the same way any other part of a website's frontend can.
- AI Chart Analysis 🔑 (also has a free web version)
Free web tool:
bash
curl "https://api.xfinlab.com/api/chart-search/AAPL?period=6mo&interval=1d"
Official API (X-API-Key, recommended for real use):
bash
curl "https://api.xfinlab.com/api/intelligence/v1/technical/AAPL" \
-H "X-API-Key: YOUR_KEY"
python
import requests
r = requests.get(
"https://api.xfinlab.com/api/intelligence/v1/technical/AAPL",
headers={"X-API-Key": "YOUR_KEY"},
)
data = r.json()["data"]
print(data["confluence"]["direction"], data["confluence"]["confidence_pct"])
print(data["support"], data["resistance"])
Response includes confluence (direction/confidence/bullish & bearish signal list), trend, support/resistance, decision_levels, and market_structure — all computed from real OHLC history, never AI-guessed. The official API version omits raw OHLC bars (licensing); the free web version includes them.
- Stress Lab 🔑 (also has a free web version)
Free web tool:
bash
curl -X POST "https://api.xfinlab.com/api/stress-lab" \
-H "Content-Type: application/json" \
-d '{"symbol": "Stocks/Bonds 60/40", "amount": 100000, "horizon_days": 252}'
Official API:
python
import requests
r = requests.post(
"https://api.xfinlab.com/api/intelligence/v1/stress-test",
headers={"X-API-Key": "YOUR_KEY"},
json={"symbol": "AAPL", "amount": 100000, "horizon_days": 252},
)
d = r.json()["data"]
print(f"Median outcome: ${d['ending_value_p50']:,.0f}")
print(f"5th percentile (bad case): ${d['ending_value_p5']:,.0f}")
print(f"Median max drawdown: {d['max_drawdown_p50_pct']}%")
This runs a real bootstrap Monte Carlo over actual historical returns (n_real_observations tells you exactly how much real history backed the simulation) — not a fabricated volatility assumption.
- Free Signals 🌐 (no key, no official API equivalent) bash curl "https://api.xfinlab.com/api/free-signals"
Returns today's top confluence-ranked signals across stocks/futures/crypto: {date, signals:[{ticker, label, price, confluence_direction, confluence_confidence_pct, ...}], locked_count, plan}. locked_count tells you how many additional rows exist behind a login — this endpoint intentionally rations rows for non-logged-in callers, so don't build anything that assumes a fixed row count.
- Opportunity Radar 🔑 (also has a free web version)
Free web tool:
bash
curl "https://api.xfinlab.com/api/free-tools-demo/opportunity-radar"
Official API:
bash
curl "https://api.xfinlab.com/api/intelligence/v1/opportunity-radar" \
-H "X-API-Key: YOUR_KEY"
Both return the same shape: real % change per indicator across real_estate, supply_chain, consumer_demand, energy, agriculture — each indicator reports its own trailing change against itself, never a fabricated cross-industry composite score (see methodology_note in the response for the exact math).
- Stock Screener 🌐 (no key, no official API equivalent) bash curl -X POST "https://api.xfinlab.com/api/ai-analysis" \ -H "Content-Type: application/json" \ -d '{"filters": {"sector": "Technology", "growth": "high"}}'
Returns AI-written commentary (conclusion, analysis) grounded in the filter criteria you pass — this is a free-text research aid, not a structured list-of-tickers-with-scores endpoint. If you need a structured, code-friendly screen, this isn't it yet (flagging as a real gap, not glossing over it).
- Pairs Statistical Arbitrage Scanner 🌐 (no key, no official API equivalent) bash curl -X POST "https://api.xfinlab.com/api/pairs-scan" \ -H "Content-Type: application/json" \ -d '{"symbol_a": "KO", "symbol_b": "PEP", "period": "6mo"}'
Returns z_score, correlation, divergence, and which side of the pair is richer_symbol/cheaper_symbol — a correlation + z-score divergence read on the real historical spread, explicitly not a formal cointegration test (the page says so, and so does the API).
- Probability Scan 🌐 (no key, no official API equivalent) bash curl "https://api.xfinlab.com/api/pipeline/AAPL"
Combines real market data, technicals, and news sentiment into bullish_probability/bearish_probability. The page itself carries a disclaimer that the underlying scoring formulas aren't yet backtested — treat this as a reference number, not a calibrated probability, same as the site does.
- News Denoise Analysis 🌐 (no key, no official API equivalent) bash curl -X POST "https://api.xfinlab.com/api/news-denoise" \ -H "Content-Type: application/json" \ -d '{"topic": "AAPL"}'
Returns an AI-generated summary (analysis, conclusion) that filters sensationalized language out of recent headlines for a ticker or topic — this is generated live per-request, not pulled from a structured news database, so wording will vary call to call even for the same topic.
- Portfolio Allocation Analysis 🌐 (no key, no official API equivalent) bash curl "https://api.xfinlab.com/api/portfolio"
Without a login token this returns a default basket; with a site-login token query param it personalizes to that user's actual watchlist. Returns suggested allocation weights per ticker based on each ticker's real market score — not equal-weighted, not user-set.
Which one should you actually build on?
If you're evaluating XFINLAB as a data provider for something you'll maintain long-term, start with the 3 🔑 endpoints — those are the ones with a documented contract and a reason to expect they won't move under you. The 6 🌐 endpoints are genuinely useful for quick scripts and one-off research, and I'm not hiding them, but they're free-tier site plumbing, not a product commitment.
Free API key (no card, instant): https://www.xfinlab.com/intelligence-api.html Repo (SDKs + MCP server source): https://github.com/lnanology/Xfinlab
Curious what other free-tier financial APIs people here have built — what's your split between "documented product" vs "free site tooling"?
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