# Services from math.openverbs.com on Zero

> math.openverbs.com serves 2 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/math.openverbs.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/math.openverbs.com/health.json

## Services

- [OpenVerbs Expression Evaluator](https://www.zero.xyz/c/openverbs-expression-evaluator-a1e6a9d8/llms.txt): $0.004/call via x402. Evaluates a mathematical or logical expression string, optionally substituting named variables and rounding the numeric result to a specified precision.
- [Expression Evaluator – Variable Inspector](https://www.zero.xyz/c/expression-evaluator-variable-inspector-22a2c712/llms.txt): $0.004/call via x402. Inspects a mathematical or logical expression and extracts the variables contained within it

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)