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

> data-calc.x402tookit.com serves 10 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/data-calc.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/data-calc.x402tookit.com/health.json

## Services

- [RAID Capacity Calculator](https://www.zero.xyz/c/raid-capacity-calculator-e3cdc28f/llms.txt): $0.02/call via x402. Calculates usable capacity, storage efficiency, fault tolerance, write penalty, and rebuild read-error risk for RAID 0/1/5/6/10 and ZFS RAID-Z arrays.
- [Systems Capacity Calculators – Peak Load Unit Sizing & Redundancy Planner](https://www.zero.xyz/c/systems-capacity-calculators-peak-load-unit-sizing-redundancy-planner-f7845120/llms.txt): $0.02/call via x402. Calculates how many units (servers, nodes, pods) are needed for a peak load at a target utilization, with N+k redundancy, plus utilization after failures and growth projection.
- [M/M/1 and M/M/c Queue Theory Calculator](https://www.zero.xyz/c/m-m-1-and-m-m-c-queue-theory-calculator-9e983dfc/llms.txt): $0.02/call via x402. Computes queueing model metrics (utilisation, Erlang C probability, queue length, wait times, tail probabilities) for M/M/1 and M/M/c systems given arrival and service rates.
- [Storage Growth & Capacity Calculator](https://www.zero.xyz/c/storage-growth-capacity-calculator-f7c0ae57/llms.txt): $0.02/call via x402. Calculates compound storage growth over time: projected size after N months, raw capacity requirements with replication and overhead, time to double, and months until storage is full.
- [SLA Downtime Calculator](https://www.zero.xyz/c/sla-downtime-calculator-79296cb2/llms.txt): $0.02/call via x402. Converts an SLA availability percentage into allowed downtime per day, month, and year, with optional series and parallel composition of components.
- [Little's Law Systems Capacity Calculator](https://www.zero.xyz/c/little-s-law-systems-capacity-calculator-761a2660/llms.txt): $0.02/call via x402. Applies Little's Law (L = λW) to solve for concurrency, throughput, or latency given any two of the three, and computes recommended pool sizes.
- [Erlang B & C Staffing Calculator](https://www.zero.xyz/c/erlang-b-c-staffing-calculator-25aeccc0/llms.txt): $0.02/call via x402. Calculates the number of trunks (Erlang B) or agents (Erlang C) needed to meet a blocking probability target or service level objective given offered traffic load in erlangs.
- [Big-O Complexity Class Comparison Calculator](https://www.zero.xyz/c/big-o-complexity-class-comparison-calculator-1caf3bc6/llms.txt): $0.02/call via x402. Compares common algorithmic growth classes (n, n log n, n², 2ⁿ, n!) at a given input size n, returning operation counts, estimated run times, and the largest n feasible within a time budget.
- [Latency Budget Analyzer](https://www.zero.xyz/c/latency-budget-analyzer-691d0ef6/llms.txt): $0.02/call via x402. Breaks down serial stage latencies against a total target, computes per-stage share and slack, identifies the bottleneck, and quantifies tail amplification from fan-out parallelism.
- [Throughput Budget Calculator](https://www.zero.xyz/c/throughput-budget-calculator-cedccd24/llms.txt): $0.02/call via x402. Converts requests-per-second and payload size into Mbps bandwidth requirements, applying peak factor, protocol overhead, and link headroom checks.

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)