# Services from grades-calc.x402tookit.com on Zero

> grades-calc.x402tookit.com serves 8 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/grades-calc.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/grades-calc.x402tookit.com/health.json

## Services

- [Grades & Study Calc – Weighted Grade Calculator](https://www.zero.xyz/c/grades-study-calc-weighted-grade-calculator-73f70d45/llms.txt): $0.02/call via x402. Calculates an overall class grade from a list of categories or assignments, each with a score, maximum, and weight, normalizing weights that don't sum to 100.
- [Grades & Study Calc — GPA Calculator (4.0 Scale)](https://www.zero.xyz/c/grades-study-calc-gpa-calculator-4-0-scale-6665bc44/llms.txt): $0.02/call via x402. Calculates weighted or unweighted GPA on the 4.0 scale from a list of letter grades, credit hours, and optional course levels (regular, honors, AP/IB).
- [Grades & Study Calc – Grade Curve](https://www.zero.xyz/c/grades-study-calc-grade-curve-d1ccf49a/llms.txt): $0.02/call via x402. Curves a set of test scores using add-points, scale-to-top, or square-root method, returning original and adjusted scores with before/after averages.
- [Grades & Study Calc – Percent to Letter Grade](https://www.zero.xyz/c/grades-study-calc-percent-to-letter-grade-75cb138d/llms.txt): $0.02/call via x402. Converts a percentage score to a US letter grade (with optional plus/minus), 4.0 GPA points, and the points needed to reach the next grade up.
- [Grades & Study Calc – Percentile Rank](https://www.zero.xyz/c/grades-study-calc-percentile-rank-c8bdba19/llms.txt): $0.02/call via x402. Calculates the percentile rank of a score within a class list using the mean-rank method, returning rank from top, mean, median, z-score, and surrounding score counts.
- [Grades & Study Calc – Reading Planner](https://www.zero.xyz/c/grades-study-calc-reading-planner-9b63038d/llms.txt): $0.02/call via x402. Calculates pages per day, daily minutes, and a day-by-day page schedule to finish a reading assignment by its due date.
- [Grades & Study Calc – Weekly Study Hours Planner](https://www.zero.xyz/c/grades-study-calc-weekly-study-hours-planner-54e9ec86/llms.txt): $0.02/call via x402. Calculates weekly study hours from credit hours using the 2–3 hours per credit rule, returning total weekly workload and a daily study plan
- [Grades & Study Calc – Final Exam Score Needed](https://www.zero.xyz/c/grades-study-calc-final-exam-score-needed-775622ef/llms.txt): $0.02/call via x402. Calculates the score you need on a final exam (or remaining work) to achieve a target class grade, given your current grade and the final's weight.

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

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