# Services from chem.openverbs.com on Zero

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

## Services

- [Chem OpenVerbs Molar Mass Calculator](https://www.zero.xyz/c/chem-openverbs-molar-mass-calculator-bba2d8cf/llms.txt): $0.004/call via x402. Computes the molar mass (g/mol) of a chemical formula, returning total mass and per-element composition with mass fraction percentages.
- [Periodic Table Element Lookup](https://www.zero.xyz/c/periodic-table-element-lookup-7d214b0f/llms.txt): $0.004/call via x402. Look up a periodic-table element by symbol, name, or atomic number and return its atomic weight and metadata.
- [Periodic Table Element Search](https://www.zero.xyz/c/periodic-table-element-search-19390d11/llms.txt): $0.004/call via x402. Search the periodic table by name or symbol substring, returning ranked matches (exact, prefix, then substring) up to a specified limit.

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)