# Services from airports-reference.x402tookit.com on Zero

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

## Services

- [Airports Reference – Airport-to-Airport Distance Calculator](https://www.zero.xyz/c/airports-reference-airport-to-airport-distance-calculator-ee4a9477/llms.txt): $0.02/call via x402. Calculates the great-circle distance in km, miles, and nautical miles between two airports, plus a rough flight time estimate based on cruise speed.
- [Airports Reference – Airport Lookup by Code or Name](https://www.zero.xyz/c/airports-reference-airport-lookup-by-code-or-name-dc18b662/llms.txt): $0.02/call via x402. Look up an airport by IATA code, ICAO code, or name (with fuzzy matching) and return its location, elevation, type, and longest runway.
- [Airports Reference – Busiest Airports by Passenger Volume](https://www.zero.xyz/c/airports-reference-busiest-airports-by-passenger-volume-ed36c0ea/llms.txt): $0.02/call via x402. Returns a ranked list of the world's busiest large airports by annual passenger count, optionally filtered by country or continent.
- [Airports Reference: Airport Code Converter (IATA ↔ ICAO)](https://www.zero.xyz/c/airports-reference-airport-code-converter-iata-icao-58311be8/llms.txt): $0.02/call via x402. Converts an airport code between IATA (3-letter) and ICAO (4-letter) formats, validates the format, and reports whether the code is known.
- [Airports Reference – Runway Facts](https://www.zero.xyz/c/airports-reference-runway-facts-d8d6f9b9/llms.txt): $0.02/call via x402. Returns detailed runway data for an airport (longest runway, surface type, lighting, headings, closed status) looked up by IATA code, ICAO code, or airport name.
- [Airports Reference – List Airports by Country or Region](https://www.zero.xyz/c/airports-reference-list-airports-by-country-or-region-16d670c8/llms.txt): $0.02/call via x402. Returns a filtered list of airports in a given country or ISO region, including IATA/ICAO codes, size, location, and scheduled service status.
- [Airports Reference – Nearest Airports by Coordinates](https://www.zero.xyz/c/airports-reference-nearest-airports-by-coordinates-c68da773/llms.txt): $0.02/call via x402. Returns a ranked list of airports nearest to a given latitude/longitude, with distance, bearing, IATA/ICAO codes, type, and optional filters for size and scheduled service.
- [Airports Reference – Airport Timezone Offset](https://www.zero.xyz/c/airports-reference-airport-timezone-offset-4d95c580/llms.txt): $0.02/call via x402. Returns a nominal solar UTC offset for an airport and reports that actual timezone data is not available in the dataset.

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)