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

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

## Services

- [Automotive Calculators – Tire Size Comparison & Speedometer Error](https://www.zero.xyz/c/automotive-calculators-tire-size-comparison-speedometer-error-1b9f2e02/llms.txt): $0.02/call via x402. Calculates physical dimensions for a tire size code and computes speedometer/odometer error when switching to a different tire size
- [Automotive Depreciation Calculator](https://www.zero.xyz/c/automotive-depreciation-calculator-c500a128/llms.txt): $0.02/call via x402. Projects vehicle value year-by-year using straight-line, declining-balance, or custom schedule depreciation methods, with total loss summary.
- [Automotive Lease vs. Buy Calculator](https://www.zero.xyz/c/automotive-lease-vs-buy-calculator-2f1d30ce/llms.txt): $0.02/call via x402. Compares leasing vs. buying a vehicle over the lease term by computing lease payment, loan payment, resale equity, and net cost for each option.
- [Automotive Gear RPM Calculator](https://www.zero.xyz/c/automotive-gear-rpm-calculator-e0d1c608/llms.txt): $0.02/call via x402. Calculates engine RPM at a given road speed (or speed at a given RPM) based on tire size, axle ratio, and transmission gear ratios, returning a per-gear table.
- [Automotive Acceleration & Performance Estimator](https://www.zero.xyz/c/automotive-acceleration-performance-estimator-3511e43b/llms.txt): $0.02/call via x402. Estimates quarter-mile time and trap speed from vehicle weight and horsepower using the Hale formula, plus a power-limited lower bound for 0-60 mph.
- [Automotive Towing Payload Calculator](https://www.zero.xyz/c/automotive-towing-payload-calculator-e2ed07cd/llms.txt): $0.02/call via x402. Checks whether a vehicle-trailer combination is safe by calculating payload remaining after occupants, cargo, and tongue weight against tow rating and combined weight limits.
- [Automotive Stopping Distance Calculator](https://www.zero.xyz/c/automotive-stopping-distance-calculator-f3a1fbff/llms.txt): $0.02/call via x402. Calculates total stopping distance (reaction distance + braking distance) for a given speed, road surface condition, and grade.
- [Automotive Engine Calculator](https://www.zero.xyz/c/automotive-engine-calculator-faaa069f/llms.txt): $0.02/call via x402. Calculates engine displacement (cc, litres, cubic inches), compression ratio, bore-stroke ratio, and mean piston speed from bore, stroke, cylinders, and optional parameters.
- [EV Efficiency Calculator](https://www.zero.xyz/c/ev-efficiency-calculator-c6da2c8a/llms.txt): $0.02/call via x402. Converts an EV efficiency figure between units and computes range, annual energy cost, and savings versus a gas car.
- [Automotive Fuel Trip Cost Calculator](https://www.zero.xyz/c/automotive-fuel-trip-cost-calculator-0c7ab587/llms.txt): $0.02/call via x402. Calculates fuel consumption, total cost, cost per person, tank range, refuel stops, and optionally compares a second vehicle across multi-leg road trips with different driving modes (city/highway).

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

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