Frequently Asked Questions
Find answers to common questions about QuantHQ subscriptions, API access, and more.
What is market regime detection?
Market regime detection is the process of identifying distinct market states such as bullish, bearish, or neutral conditions. Hidden Markov Models analyze price patterns to estimate the probability that markets are in each regime state, helping traders adapt their strategies to current market conditions.
How do Hidden Markov Models work for trading?
Hidden Markov Models (HMMs) are statistical models that identify hidden states from observable data. In trading, HMMs analyze price movements to infer underlying market regimes that aren't directly observable. The model calculates probabilities for each regime state based on historical patterns.
What is the rhoT signal?
The rhoT signal is QuantHQ's daily regime probability output. It represents the consensus view from our ensemble of Hidden Markov Models about the current market regime state. The signal is delivered as a JSON response through our REST API.
Which market indices does QuantHQ analyze?
QuantHQ analyzes five major US equity indices: SPY (S&P 500), QQQ (Nasdaq-100), DIA (Dow Jones), IWM (Russell 2000), and VTI (Total Stock Market). Each index has its own ensemble of HMMs generating independent regime signals.
How far back does historical data go?
QuantHQ's historical regime signals start from January 15, 2015. All historical signals use walk-forward methodology to avoid lookahead bias, meaning each signal was generated using only information available at that point in time.
What is regime-aware asset allocation?
Regime-aware asset allocation adjusts portfolio positioning based on detected market regimes. For example, traders might reduce equity exposure during bearish regimes or increase it during bullish regimes. QuantHQ's probability signals can inform these allocation decisions.
How fast is the QuantHQ API?
QuantHQ's REST API delivers regime signals in under 500 milliseconds. The API is built on horizontally scalable infrastructure designed for production trading systems that need reliable, low-latency access to market intelligence.
What format does the API return?
The QuantHQ API returns standardized JSON responses containing regime probabilities, dates, and the rhoT signal for the requested index and time period. Authentication uses Bearer tokens passed in the request header.
Can I backtest strategies using QuantHQ signals?
Yes, QuantHQ provides historical regime signals back to January 2015 that can be used for backtesting. All historical data uses walk-forward methodology to ensure realistic backtests without lookahead bias.
What are the limitations of regime detection?
Regime detection provides probabilistic signals, not certainties. Market regimes can change rapidly, and no model can predict all market movements. Regime signals are one input among many for trading decisions and should be combined with proper risk management.
Learn more about market regime detection and how to use it in your trading strategies.
How do I manage my subscription?
You can manage your subscription, update your plan, change payment methods, view invoices, and cancel your subscription through the Team Settings page.
Manage SubscriptionWhere can I view my current plan?
Your current plan, subscription status, and billing information are displayed on the Team Settings page.
How do I cancel my subscription?
To cancel your subscription, go to the Team Settings page and click "Manage Subscription". This will take you to the Stripe Customer Portal where you can cancel your subscription. Your access will continue until the end of your current billing period.
Can I change my plan?
Yes! You can upgrade or downgrade your plan at any time through the Team Settings page. Click "Manage Subscription" to access the Stripe Customer Portal where you can change your plan. Changes take effect immediately, and you'll be charged or credited on a prorated basis.
How do I get my API key?
After signing up, you'll automatically receive a default API key. You can view, regenerate, and manage your API keys from the API Keys page in your dashboard.
Manage API KeysWhere can I find API documentation?
Complete API documentation, including endpoints, request/response formats, authentication, and code examples, is available in the API Docs section of your dashboard.
View API DocumentationWhat are the API rate limits?
API rate limits depend on your subscription plan. Free plans have limited daily quotas, while paid plans offer higher limits. You can view your current usage and quota on the API Keys page. Rate limits reset daily at midnight UTC.
How do I invite team members?
Team owners can invite members from the Team Settings page. Simply enter the email address and select a role (member or owner). The invited user will receive an email with instructions to join your team.
Manage TeamHow do I update my account information?
You can update your name and email address from the General Settings page in your dashboard.
Update AccountHow do I contact support?
For technical support, billing questions, or general inquiries, please email us at:
We typically respond within 24-48 hours during business days.
Where can I learn more about QuantHQ?
Check out our blog for research articles, tutorials, and insights about market regime detection, algorithmic trading, and quantitative finance.
View BlogWhere can I view product information?
Learn more about our HMM Regime Detection API, stock ranking models, and other products on the Products page.
View Products