# QuanterraOS > Independent telemetry, true-cost calculation, settlement radar, and calibration benchmarking for prediction markets (Kalshi and Polymarket). ## 1. Core Positioning & Guardrails - **Neutrality:** QuanterraOS is an independent analytics tool by Quantara Global LLC. We do not place trades, hold custody, take exchange referral commissions, or provide investment advice. - **Rule B5 Guardrail:** Permanent $0 live capital circuit breaker. Zero order routing exists anywhere in the codebase. - **No Winning Promises:** Outputs are purely arithmetic reflections and empirical observations. We never promise alpha or positive expected returns. - **The Fee is the House Edge:** On Kalshi, taker fees are non-linear: `fee = ceil(0.07 × C × P × (1 - P) × 100) / 100`. At 50¢, a trader needs 51.75%+ just to break even. - **Settlement Truth:** Kalshi BTC contracts settle against the 60-second TWAP of the CME CF BRTI index, not instantaneous single-exchange spot tickers. - **Calibration Truth:** The Kalshi market mid (Brier 0.2001) empirically beats our proprietary model (0.2063) across 1,316 settled windows. We publish the truth when the market wins. ## 2. Machine Interfaces & Documentation - **OpenAPI 3.1 Spec:** https://quanterraos.com/openapi.json - **Model Context Protocol (MCP):** https://quanterraos.com/api/mcp - **Agent Instructions:** https://quanterraos.com/agents.md - **Discovery Endpoint:** https://quanterraos.com/.well-known/mcp.json - **Web Interface:** https://quanterraos.com - **Public Audit Proof:** https://quanterraos.com/proof ## 3. Core REST Endpoints - `POST /api/v1/fees/check`: Compute executable cost, regulatory taker fees, breakeven hurdle, and coin-flip hazard flags. - `GET /api/v1/radar/{ticker}`: Real-time CME CF BRTI 60s TWAP progression, spot exchange dispersion, and strike delta. - `GET /api/v1/sensors/trades`: Large-trade feed with net-after-fees and settlement basis. - `GET /api/v1/calibration/brier`: Murphy-decomposed Brier score metrics across 1,316 settled windows. ## 4. Rate Limits & Pricing - **Cadet (Free API):** 1,000 requests/month, delayed radar data. Rate limit header: `X-RateLimit-Limit: 1000`. - **Builder API ($49/mo):** 50,000 requests/month, real-time REST, full MCP access. Rate limit header: `X-RateLimit-Limit: 50000`. - **Institutional ($1,500+/mo):** Unmetered WebSocket feeds, historical tick datasets. ## 5. Embeddable Widgets - Fee & Breakeven Calculator: `https://quanterraos.com/embed/calculator` - BRTI-vs-Spot Dispersion Ticker: `https://quanterraos.com/embed/dispersion` - Live 15-Min BTC Countdown: `https://quanterraos.com/embed/countdown` - Calibration Badge: `https://quanterraos.com/embed/calibration` - Net-Price Comparator: `https://quanterraos.com/embed/comparator` - Universal Script Loader: ``