# Services from invest-math.x402tookit.com on Zero

> invest-math.x402tookit.com serves 12 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/invest-math.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/invest-math.x402tookit.com/health.json

## Services

- [Investing Math – Expected Move Calculator](https://www.zero.xyz/c/investing-math-expected-move-calculator-2820ce5e/llms.txt): $0.02/call via x402. Calculates the price range implied by volatility over a specified number of days, returning one and two standard deviation move bounds.
- [Investing Math – Risk/Reward Calculator](https://www.zero.xyz/c/investing-math-risk-reward-calculator-c46232c2/llms.txt): $0.02/call via x402. Calculates reward-to-risk ratio, break-even win rate, and expectancy for a trade given entry, stop-loss, and profit target prices.
- [Investing Math: Two-Asset Portfolio Risk & Return](https://www.zero.xyz/c/investing-math-two-asset-portfolio-risk-return-c68b8292/llms.txt): $0.02/call via x402. Computes the expected return, volatility, and minimum-variance weight for a two-asset portfolio given each asset's return, volatility, and their correlation.
- [Investing Math – FIRE Number Calculator](https://www.zero.xyz/c/investing-math-fire-number-calculator-b131f7b1/llms.txt): $0.02/call via x402. Calculates the financial-independence target (FIRE number) from annual spending and withdrawal rate, plus the estimated years to reach it given current savings and yearly contributions.
- [Investing Math – Position Size Calculator](https://www.zero.xyz/c/investing-math-position-size-calculator-d01c1382/llms.txt): $0.02/call via x402. Calculates the number of units to buy, dollars at risk, position cost, and R-multiple profit targets from account size, risk percentage, entry price, and stop-loss price.
- [Investing Math – Period Return Statistics](https://www.zero.xyz/c/investing-math-period-return-statistics-28d337f1/llms.txt): $0.02/call via x402. Computes performance statistics from a series of period returns: mean, volatility, Sharpe ratio, Sortino ratio, CAGR, max drawdown, win rate, and more.
- [Investing Math – Inflation Adjustment Calculator](https://www.zero.xyz/c/investing-math-inflation-adjustment-calculator-c87a6666/llms.txt): $0.02/call via x402. Calculates the inflation-adjusted future cost of an amount and the real return after inflation for a given nominal return rate.
- [Investing Math – Margin Call Price Calculator](https://www.zero.xyz/c/investing-math-margin-call-price-calculator-eb56df44/llms.txt): $0.02/call via x402. Calculates the margin call trigger price for shares bought on margin, given the number of shares, purchase price, cash invested, and maintenance margin requirement.
- [Investing Math – Dividend Yield & Income Calculator](https://www.zero.xyz/c/investing-math-dividend-yield-income-calculator-0e64760a/llms.txt): $0.02/call via x402. Calculates dividend yield, annual/monthly income, yield on cost, and projected cumulative dividends over time with optional dividend growth.
- [Investing Math – Option Payoff Calculator](https://www.zero.xyz/c/investing-math-option-payoff-calculator-08b6c92e/llms.txt): $0.02/call via x402. Calculates expiry profit/loss for a long or short call or put option, including break-even price, maximum gain, maximum loss, and a payoff table across price scenarios.
- [Investing Math: DCA vs Lump Sum Comparator](https://www.zero.xyz/c/investing-math-dca-vs-lump-sum-comparator-65ac958b/llms.txt): $0.02/call via x402. Compares dollar-cost averaging (equal periodic buys) against a single lump-sum investment on the first date, given a series of prices, returning returns, units acquired, and a verdict on which strategy won.
- [Investing Math: Drawdown & Recovery Calculator](https://www.zero.xyz/c/investing-math-drawdown-recovery-calculator-14bd602e/llms.txt): $0.02/call via x402. Calculates the gain needed to recover from a percentage loss, or computes maximum drawdown and required recovery gain from a series of period returns.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)