rebar-finance
Market hours, trading-day math, option-symbol parsing, and Black-Scholes greeks — the deterministic finance math LLMs get wrong, offline, no market-data API key.
mcp
finance
market-hours
+7
|How to pay
Subscribe
Monthly billing
$3/month
Predictable monthly cost with included usage. Best for steady, high-volume traffic.
- Unlimited tools within plan limits
- One API key, billed once a month
- Cancel any time
rebar-finance
The offline, no-API-key finance utility for AI agents. Is the market open right now, is this a trading day, parse this option symbol, what's the theoretical delta — without a market-data subscription.
Tools
- finance_market_status / finance_is_trading_day / finance_trading_days_between / finance_next_market_session — NYSE/Nasdaq sessions with the half-day (1:00pm ET early close) and observed-holiday rules that naive 9:30–16:00 logic gets wrong. Covers 2024–2035, DST-correct.
- finance_parse_option_symbol / finance_build_option_symbol — exact OCC option-symbol round-trip.
- finance_option_greeks / finance_implied_volatility — Black-Scholes-Merton price, delta/gamma/theta/vega/rho, and an IV solver. Pure compute, no market data.
Why
Every other finance MCP is a paid real-time-data feed. These eight tools are pure offline calculation — no API key, no per-call upstream cost, structured outputs typed for LLM consumption, spend-capped by default.