Institutional-grade tools, for independent traders
SellCallPut is an independent research platform built to give working traders the same quality of evidence, data, and tooling the big desks already have — as education, never advice.
Why SellCallPut exists
Most retail traders are playing a game where the other side of the table already knows the rules, owns the data, and runs the infrastructure. The big desks have tools, feeds, and analytical firepower a retail trader historically couldn't touch — and a culture that treats retail flow as something to be harvested rather than respected. That's the default. It doesn't have to stay that way.
Modern cloud infrastructure and AI tooling now make it possible to build and run, at a reasonable cost, what would have cost a proprietary trading firm millions of dollars ten years ago. Curate real market data. Run backtests on five years of intraday bars. Compute dealer positioning, order flow, and gamma exposure in near real-time. Publish the methodology openly so every number can be audited.
SellCallPut is that build. It is a research platform for people with day jobs — software engineers, professionals, students — who want to understand options the way the people trading against them already understand them. Not tips. Not signals. A real, data-driven education, with the actual mechanics visible.
You will never see "buy this" or "sell this" on SellCallPut. Every trade you place is your own decision with your own money. Our job is to make sure that when you make that decision, you are not the only person at the table who doesn't know how the game works.
What's under the hood
Every partner listed below is a production dependency. We picked them because they are boring, battle-tested, and let us spend time on research instead of plumbing.
Stripe
Billing & subscriptionsPowers every paid tier, trial, proration, invoice, and refund on SellCallPut. Webhooks sync subscription state to our database so tier access updates the second a customer upgrades, cancels, or a payment fails. We never touch card numbers — Stripe handles PCI compliance end-to-end.
Cloudflare
CDN, DNS, WAFServes every static asset, terminates TLS, and fronts sellcallput.com + api.sellcallput.com. The WAF blocks bot traffic and known attack signatures before it ever reaches our origin. DDoS protection and global anycast mean the site stays fast whether you're in Toronto, Mumbai, or Sydney.
MongoDB Atlas
Primary data storeEverything the platform remembers lives here behind indexed queries — user accounts, subscription state, saved settings, published content, signal outputs, backtest history, and booking records. Purpose-built clusters keep the platform fast as content and history grow.
Twilio
SMS & phone verificationSends phone verification codes during signup and transactional SMS alerts for time-sensitive platform events. Global carrier coverage keeps delivery reliable across regions.
SendGrid
Transactional emailDelivers email verification, password resets, booking confirmations, subscription receipts, and the morning brief. Reputation-managed IP pools keep us out of spam folders so you actually see the messages that matter.
Anthropic Claude
AI analysis layerPowers the natural-language summaries on the morning brief, the blog drafting assist, and the research copilots that translate raw data into plain-English explanations. Used as a reasoning layer on top of our deterministic signals — never as a predictor.
Algorithms running on the platform
Every signal below is deterministic, reproducible from public market data, and documented. No black boxes, no curve-fit magic — just classical market microstructure applied consistently.
Pulse Morning Bias
An 8-signal SPY bias computed before the open: overnight gap, prior-day internals, VIX regime, breadth, sector leadership, futures positioning, key level proximity, and options skew. Emits a Long / Neutral / Short lean plus the evidence behind it.
Live trade classification
Every option print is classified buyer-initiated or seller-initiated in real time. The result: you see actual buying versus selling pressure as it happens, not just trade volume after the fact.
Greed & Fear engine
Seven indicators combined into a single 0–100 sentiment reading, refreshed on each market snapshot: price momentum, stock-price strength, put/call ratio, market volatility, safe-haven demand, junk-bond demand, and market breadth.
Gamma flip & dealer positioning
Aggregates open interest across the SPY option chain, weights by gamma, and locates the spot price where dealer gamma flips from positive to negative. Above flip = dealers dampen moves; below flip = dealers amplify them.
Order-flow oscillator
Net buy-minus-sell volume on option flow, separated by trade size (retail, mid, whale). Exposes where the real money is actually moving instead of what the headlines say.
Encoded intraday strategy
A canonical rule-based intraday SPY setup encoded directly on the platform — fully backtested across five years of intraday data, with every fill and P&L number auditable end to end.
Volume & OI delta charts
Tracks strike-by-strike changes in volume and open interest through the session so you can see where positioning is being built, closed, or rolled — not just where it already sits.
Strategy Sandbox
A deterministic backtester that replays historical intraday bars tick-by-tick against user-defined entry, exit, and risk rules. Every result is reproducible, with full fills, P&L, drawdown, and win-rate tables.
What We Stand For
Evidence over opinion
Every claim is backed by a backtest or a cited source. If it can't be measured, it shouldn't be sold.
Education, not advice
We teach mechanics, probability, and risk. What you do with that understanding is your decision — and ideally, your financial advisor's.
Transparent methodology
Every backtest publishes its assumptions, its data window, and what it deliberately ignores. No black boxes.
Independent, no conflicts
No affiliate links to brokers, no paid promotions, no managed accounts. Just research, published honestly.