Market Report App C4 Diagrams

Cloudflare-based automated weekly market report pipeline. Architecture by Loup, Aug 13, 2026. Pure inline SVG.
What this is: An automated pipeline producing Kevin's Weekly Opportunity Report. Fetches market data from APIs, synthesizes via two-pass LLM (Claude + GPT-4o-mini validation), publishes to Cloudflare Pages. The two-pass approach prevents data fabrication.

Level 1 - System Context

Context Diagram
Market Report App between Kevin and external data sources, LLM providers, and delivery channels.
Kevin[Person]Receives reports,executes trades Market Report App[Software System]Cloudflare Workers pipeline.Fetches data, synthesizesreport via LLM, validatesevery number, publishesto Pages + emails Kevin.Risk-first: Rule #1dont lose money.Cron: weekly Fri/SatTwo-pass LLM validation Market Data APIs[External]Polygon, FRED, BLS Economic Data[External]FRED, BLS free APIs LLM Provider[External]Claude + GPT-4o-mini Email / Slack[External]Delivery to Kevin CF Pages[External]Report hosting receives reports feedback fetches prices fetches data synthesis+validation delivers publishes
Architecture by Loup based on WR#16 experience

Level 2 - Container Diagram

Container Diagram
Worker orchestrates pipeline. Two-pass LLM: Claude synthesis then GPT-4o-mini validation. KV stores positions/history. Pages hosts output.
Market Report App - Cloudflare Kevin[Person]receives reports Cron Trigger[CF Cron]Weekly Fri/Sat 20:00 Data Fetcher[Worker module]Calls Polygon, FRED, BLSReturns JSON: prices,yields, CPI/PPI Position Tracker[Worker module]Loads positions from KVcomputes P&L, checksexit triggers Report Synthesizer[Worker to Claude]System prompt: risk-firstthesis labels, Kevins rulesData-first context (JSON) Validation Gate[Worker to GPT-4o]Checks every number vssource JSON. Flagsdiscrepancies. Report Publisher[Worker module]Deploy to Pages, email KV Store[Cloudflare KV]Positions, history CF Pages[CF Pages]Report hosting Market APIs[External]Polygon, FRED, BLS Claude API[External]Anthropic GPT-4o-mini[External]OpenAI Email/Slack[External]Delivery triggers data JSON positions draft validated read/write publish API calls synthesis validation sends
Two-pass LLM prevents fabrication. Pass 1: Claude synthesizes. Pass 2: GPT-4o-mini validates every number against source JSON.

Pipeline Flow

7-Step Weekly Pipeline
Steps 4-5 are the two-pass LLM approach. If validation finds discrepancies, report is flagged for review.
Cron trigger Fri/Sat 20:00 1. Fetch market dataPolygon: prices, VIX 2. Fetch economic dataFRED yields, BLS CPI/PPI 3. Load positions, compute P&LKV: tickers, exit triggers 4. Claude synthesis (Pass 1)Risk-first from verified JSON 5. GPT-4o-mini validation (Pass 2)Check numbers vs source Discrepancy? Flag 6. Publish to CF Pages 7. Email/Slack to Kevin checkclean
Pass 1 generates report. Pass 2 validates every number. If mismatch: flag for review, dont publish.
C4 by Loup Aug 13 2026 - Pure SVG - No dependencies