Tapeline
A live quantitative market scanner for retail traders.
Tapeline surfaces high-conviction technical and fundamental signals across US stocks and ETFs. It scores ~2,500 tickers every minute during market hours, detects Bollinger Band squeezes and volume expansions, surfaces recent insider buys (SEC Form 4), and classifies the overall market regime. (A Congressional-trades surface is built and Premium-gated, but no disclosure feed is wired yet.)
Built on the same engine that powers a production personal trading bot.
Status
Live. tapeline.io is served by the Fly.io app tapeline-web; the API runs at api.tapeline.io (Fly app tapeline-backend). Real market data comes from Massive, with Finnhub for fundamentals, calendars and SEC Form 4 insider transactions, and FRED for macro. Three live tiers, Stripe billing, and a public scorecard. This repo stays separate from the personal C:\signal-system\ engine — no shared files.
Architecture (see docs/ARCHITECTURE.md)
┌──────────────────────┐ ┌──────────────────┐ ┌─────────────────┐
│ Massive SIP feed │─────▶│ Scoring worker │─────▶│ Postgres │
│ (Polygon, rebranded │ │ (adapted from │ │ (scores, │
│ 2025-10-30) │ │ signal-system) │ │ snapshots) │
└──────────────────────┘ └──────────────────┘ └────────┬────────┘
│
▼
┌──────────────────────┐ ┌──────────────────┐ ┌─────────────────┐
│ Next.js dashboard │◀─SSE─│ FastAPI │◀─────│ Read API │
│ (scanner, squeeze, │ │ (auth, billing, │ │ │
│ regime, congress) │ │ live stream) │ │ │
└──────────────────────┘ └──────────────────┘ └─────────────────┘
│ │
▼ ▼
┌──────────────────────┐ ┌──────────────────┐
│ Cookie-JWT auth │ │ Stripe (billing)│
└──────────────────────┘ └──────────────────┘
Stack
- Backend: Python 3.12 + FastAPI + SQLAlchemy + Alembic
- Database: Postgres (Supabase or Neon)
- Frontend: Next.js 16 + TypeScript + Tailwind + shadcn/ui
- Auth: native cookie-JWT sessions (
services/session.py), with emailed sign-in codes as a new-device second factor; Clerk and Google/Microsoft OAuth are env-gated add-ons
- Billing: Stripe
- Data feed: Massive Stocks Starter ($29/mo) — formerly Polygon.io, rebranded 2025-10-30. Licence scope is under review; see
docs/LICENSE_AUDIT.md
- Macro / fundamentals / smart money: FRED · Finnhub (fundamentals, SEC Form 4 insider transactions, earnings + IPO calendars)
- Deployment: Fly.io —
tapeline-backend (API + scoring worker) and tapeline-web (Next.js frontend, serves tapeline.io). Vercel builds PR previews only
- Email: Resend
Product tabs (v1)
- 📡 Scanner — ~2,500 tickers, composite score, filters, sort
- 🔥 Squeeze Watch — BB squeeze days, volume expansion, OBV trend, suggested window
- 🌊 Market Regime — current regime, VIX, DXY, 10Y, rate direction, sector leaders
- 🏛️ Congress Trades — recent politician buys/sells aggregated by ticker. Surface and Premium gate are built, but no disclosure feed is wired: the table does not accrue rows in production (see
docs/DATA_SOURCES.md).
Pricing
- Free $0 — top-10 scanner rows, live (no delay), 12 ticker look-ups per UTC day, watchlist of 5, 2 browser-push alert rules. (Open-access promo, ends 2026-09-08: scanner rows only are lifted 10 → 1,000 for signed-in Free accounts —
tier.py:PROMO_OPEN_ACCESS_UNTIL. Look-ups, watchlist and push caps are unchanged, no Pro feature unlocks, and anonymous visitors still see the top 10.)
- Pro $9.99/mo or $8.25/mo billed annually ($99/yr) — full universe live, squeeze + regime + heatmap, watchlist 50, email alerts (10/day), CSV export, browser push.
- Premium $19.99/mo or $16.58/mo billed annually ($199/yr) — everything in Pro plus Congressional trades, Recent insider buys (SEC Form 4), unlimited email alerts, watchlist 200, saved scans 100, public API (1,000 req/day).
Accounts created from 2026-08-22 add a card at first sign-in, which starts a 14-day Premium trial: $0 that day, first charge on day 14, one click to cancel. Accounts created before that date are grandfathered and are never asked for a card. The public record — scorecard, daily picks, per-ticker pages, the CSV/JSON exports and the public API — needs no account and no card.
Repo layout
backend/ FastAPI + scoring worker
frontend/ Next.js dashboard (initialize with `npx create-next-app@latest`)
infra/ Docker, deployment config
docs/ Architecture, legal checklist, data sources, pricing
scripts/ One-off ops scripts
Getting started
See docs/ARCHITECTURE.md for the full technical plan and docs/LEGAL_CHECKLIST.md for pre-launch must-dos.
What this is NOT
Tapeline is a quantitative scanning and research tool. It does not:
- Provide individualized investment advice
- Execute trades
- Make price predictions
- Manage customer funds
All output is factual data synthesis. Users make their own decisions. See docs/LEGAL_CHECKLIST.md.