Chart Library — Market Memory for Traders and AI Agents

# Chart Library — Intelligence Layer for AI Agents (Markets) > Chart Library is the intelligence layer AI agents call when they need to reason about markets the way a junior analyst with a research desk would. Cohort retrieval, calibrated forward-return distributions, regime stratification, feature attribution, and news-divergence signals — all accessible to your agent in a single tool call. ## FREE FOR AGENTS — no key, no signup, no human required The core loop is open: connect to the hosted MCP endpoint at **https://chartlibrary.io/mcp** (or `pip install chartlibrary-mcp`) and call `search → pull_comps → cohort_introspect → track_record` right now, anonymously, free. No API key, no account, no human in the loop. Paid keys exist for volume SLAs and premium surfaces (portfolio tracking, custom partitions) — never for the core research loop. Every analysis you run is logged into the public calibration ledger and audited against realized outcomes, so your usage adds observations to a rolling service record; it does not create evidence of trading edge. No MCP framework? The flagship is one plain HTTP POST — no key, no signup: curl -s https://chartlibrary.io/api/v1/cohort_analyze \ -H "Content-Type: application/json" \ -d '{"anchor":{"symbol":"NVDA","date":"2025-03-03","timeframe":"1d"},"horizons":[5]}' Returns the full comp set: outcome_distribution (n, median, win_rate, p10/p90), feature_importance (the drivers), intrinsic_features, and the coverage record. `timeframe` is one of 5m / 15m / 30m / 1h / 1d. Free up to 1,000 calls/day. **Trust receipts (live, verifiable):** - Never infer current coverage from a number copied into documentation. Read the dated rolling receipt at https://chartlibrary.io/api/v1/calibration. - Snapshot on 2026-08-16: rolling 5d empirical coverage was 78.9% across 1,117,578 settled analyses versus 80% nominal. The anytime-valid sequential audit was marked BREACH through 2026-08-03. That status means

{"openapi":"3.1.0","info":{"title":"Chart Library API","description":"Chart pattern intelligence engine for financial markets.\n\nSpecify a (symbol, date, timeframe) anchor to find the top 10 most similar historical chart patterns from 800M+ minute bars. Get cohort distributions, per-feature attribution, regime stratification, Layer 5 memory, and AI-generated narratives. Text + agent-first.\n\n## Authentication\n- **Frontend users**: JWT Bearer token from `/api/v1/auth/login`\n- **Developers / A