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VXX (Volatility ETF)
iPath Series B S&P 500 VIX - volatility proxy (updates every 15 min)
Why: VIX volatility proxy. VXX spikes during fear events. Elevated volatility suppresses risk-taking across all asset classes.
Category: macro. Macro economic indicators track monetary policy, liquidity conditions, and traditional market positioning. Changes in these metrics often lead Bitcoin price moves by days or weeks.
Source: Finnhub. Updated: Every 15 min (market hours).
API: GET /api/metrics/etf-vxx
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PreReason - Market Context API
Financial context your AI actually understands. PreReason delivers pre-reasoned financial intelligence for AI agents and developers. Bitcoin on-chain metrics, macro indicators, cross-asset correlations, trend direction, and confidence scores in one structured API response.
Key Features
One Call, Full Picture — Bitcoin, macro, mining, liquidity from 6+ sources with trends, confidence scores, and percentile ranks.LLM-Native Markdown — Responses formatted for how language models reason. ~60% fewer tokens than JSON.Agent-Ready — REST API, MCP server, llms.txt. Works with Claude Desktop, Claude Code, Cursor, Windsurf. Install: npx @prereason/mcp
17 Market Briefings
Free (6): btc.quick-check, btc.context, btc.pulse, btc.grid-stress, macro.snapshot, cross.correlations
Basic (5, $19.99/mo): btc.momentum, macro.liquidity, btc.on-chain, cross.breadth, btc.miner-survival
Pro (6, $49.99/mo): btc.full, btc.factors, cross.regime, fx.liquidity, btc.energy, btc.treasury
Pricing
Free — 60 req/hr, 500/day, 6 briefings, 30-day rolling data. No credit card.Basic $19.99/mo — 120 req/hr, 2K/day, 11 briefings, data from Jan 2025.Pro $49.99/mo — 300 req/hr, 5K/day, all 17 briefings, full historical data.Enterprise — Custom limits and SLA.
Quick Start
API: curl -H "X-API-Key: YOUR_KEY" https://api.prereason.com/api/btc
MCP: npx -y @prereason/mcp
Remote MCP: https://api.prereason.com/api/mcp
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