# Services from exoplanets-nasa.x402tookit.com on Zero

> exoplanets-nasa.x402tookit.com serves 9 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/exoplanets-nasa.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/exoplanets-nasa.x402tookit.com/health.json

## Services

- [NASA Exoplanets – Planet Habitability Screen](https://www.zero.xyz/c/nasa-exoplanets-planet-habitability-screen-7978b0f9/llms.txt): $0.02/call via x402. Checks whether a named exoplanet falls within its star's habitable zone and assesses its size class and rocky-planet plausibility.
- [NASA Exoplanets Equilibrium Temperature Calculator](https://www.zero.xyz/c/nasa-exoplanets-equilibrium-temperature-calculator-253baaf2/llms.txt): $0.02/call via x402. Calculates a planet's equilibrium temperature in Kelvin, Celsius, and Fahrenheit from orbital parameters and stellar properties
- [NASA Exoplanets Discovery Statistics](https://www.zero.xyz/c/nasa-exoplanets-discovery-statistics-fde022cc/llms.txt): $0.03/call via x402. Returns confirmed exoplanet discovery counts by year and detection method, including totals, peak year, and a cumulative time series.
- [NASA Exoplanets: Habitable Zone Calculator](https://www.zero.xyz/c/nasa-exoplanets-habitable-zone-calculator-479c64ae/llms.txt): $0.02/call via x402. Computes inner and outer habitable-zone edges in AU for a star using the Kopparapu 2013 model, and classifies where a given orbit falls relative to those zones.
- [NASA Exoplanets Transit Depth Calculator](https://www.zero.xyz/c/nasa-exoplanets-transit-depth-calculator-74dc8255/llms.txt): $0.02/call via x402. Calculates exoplanet transit depth (Rp/Rs)² in percent, ppm, and fraction from planet and star radii, with optional transit duration if orbital period and star mass are provided.
- [NASA Exoplanets - Nearest Planets Lookup](https://www.zero.xyz/c/nasa-exoplanets-nearest-planets-lookup-f67ebc53/llms.txt): $0.02/call via x402. Returns the closest known exoplanets to the Sun sorted by distance in light-years, with optional size filtering, star type, orbital parameters, and habitable-zone position.
- [NASA Exoplanets - Host Star Planet Catalog](https://www.zero.xyz/c/nasa-exoplanets-host-star-planet-catalog-8b8b9da9/llms.txt): $0.02/call via x402. Returns all confirmed exoplanets orbiting a named host star, with stellar properties and each planet's orbital period, size class, and habitable-zone position.
- [NASA Exoplanets Hill Radius Calculator](https://www.zero.xyz/c/nasa-exoplanets-hill-radius-calculator-a66b4794/llms.txt): $0.02/call via x402. Calculates a planet's Hill radius in AU and km from its mass, orbital parameters, and star mass, including stable prograde and retrograde moon regions.
- [NASA Exoplanets: Earth Comparison Calculator](https://www.zero.xyz/c/nasa-exoplanets-earth-comparison-calculator-41277101/llms.txt): $0.02/call via x402. Computes planet size, mass, density, surface gravity, and escape velocity as ratios to Earth, plus insolation if luminosity and orbital distance are provided.

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)