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

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

## Services

- [Plumbing & Pipe Flow Calc – Thermal Expansion](https://www.zero.xyz/c/plumbing-pipe-flow-calc-thermal-expansion-010cb1a0/llms.txt): $0.02/call via x402. Calculates how much a pipe run lengthens or shortens due to a temperature change for copper, steel, PVC, CPVC, PEX, or ABS materials, returning results in both inches and millimeters.
- [Plumbing & Pipe Flow Calc – Pipe Size Selector](https://www.zero.xyz/c/plumbing-pipe-flow-calc-pipe-size-selector-0dcc4ca4/llms.txt): $0.02/call via x402. Returns the smallest standard copper Type L or PVC Schedule 40 pipe nominal size that keeps water velocity under a specified maximum for a given flow rate.
- [Plumbing & Pipe Flow Calc – Flow Velocity](https://www.zero.xyz/c/plumbing-pipe-flow-calc-flow-velocity-e5abcbfd/llms.txt): $0.02/call via x402. Calculates water velocity in feet per second from flow rate and pipe size, or calculates the flow a pipe carries at a given velocity, for copper Type L or PVC Schedule 40 pipe.
- [Plumbing & Pipe Flow Calc – Pipe Volume](https://www.zero.xyz/c/plumbing-pipe-flow-calc-pipe-volume-a7ec8079/llms.txt): $0.02/call via x402. Calculates the volume of water held in a pipe run in gallons and litres (per foot and total), given nominal pipe size or inside diameter and pipe length.
- [Plumbing & Pipe Flow Calc – Drain Slope Calculator](https://www.zero.xyz/c/plumbing-pipe-flow-calc-drain-slope-calculator-f3f15f8c/llms.txt): $0.02/call via x402. Calculates the fall needed for a drain run at a given slope in inches per foot, or derives the slope from a measured fall, and compares against typical plumbing code minimums.
- [Plumbing & Pipe Flow Calc – Hazen-Williams Pressure Loss](https://www.zero.xyz/c/plumbing-pipe-flow-calc-hazen-williams-pressure-loss-09a84cac/llms.txt): $0.02/call via x402. Calculates friction pressure loss in PSI (and feet of head) over a pipe run using the Hazen-Williams formula, given flow rate, pipe size, length, and C factor.
- [Plumbing & Pipe Flow Calc – Tank Fill/Drain Time](https://www.zero.xyz/c/plumbing-pipe-flow-calc-tank-fill-drain-time-a7306402/llms.txt): $0.02/call via x402. Calculates the time in hours and minutes to fill or drain a tank given inflow rate in GPM, tank volume or round tank dimensions, and an optional simultaneous outflow rate.
- [Plumbing & Pipe Flow Calc – Bucket Test Flow Rate](https://www.zero.xyz/c/plumbing-pipe-flow-calc-bucket-test-flow-rate-cb3a6960/llms.txt): $0.02/call via x402. Calculates water flow rate in GPM and litres per minute from a simple bucket test (volume and fill time), plus hourly and daily usage estimates.

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