# Services from physics.openverbs.com on Zero

> physics.openverbs.com serves 3 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/physics.openverbs.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/physics.openverbs.com/health.json

## Services

- [Physics Constants Lookup by Key, Symbol, or Name](https://www.zero.xyz/c/physics-constants-lookup-by-key-symbol-or-name-b412a2ff/llms.txt): $0.004/call via x402. Looks up a single CODATA 2018 physical constant by its key, symbol, or exact name, returning its value, unit, uncertainty, and category.
- [Physics Constants Search](https://www.zero.xyz/c/physics-constants-search-b386ca26/llms.txt): $0.004/call via x402. Search physical constants by key, symbol, or name substring with ranked results (exact > prefix > substring matches)
- [Physics Constants List API](https://www.zero.xyz/c/physics-constants-list-api-19290f8e/llms.txt): $0.004/call via x402. Lists all physical constants in the dataset, optionally filtered by category (universal, adopted, electromagnetic, atomic, physico-chemical), returning constants, total count, and available categories.

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)