# Services from readability.openverbs.com on Zero

> readability.openverbs.com serves 4 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/readability.openverbs.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/readability.openverbs.com/health.json

## Services

- [Readability Grade Level API](https://www.zero.xyz/c/readability-grade-level-api-002f8e9c/llms.txt): $0.002/call via x402. Returns a consensus US grade level (averaging five readability formulas), Flesch Reading Ease score, plain-language difficulty band, and approximate reader age range for a given text.
- [Readability Reading & Speaking Time Estimator](https://www.zero.xyz/c/readability-reading-speaking-time-estimator-b9931811/llms.txt): $0.002/call via x402. Estimates how long it takes to read or speak a given text, based on configurable words-per-minute rates.
- [Readability Score API](https://www.zero.xyz/c/readability-score-api-5842e784/llms.txt): $0.002/call via x402. Computes six standard English readability formulas (Flesch Reading Ease, Flesch–Kincaid grade, Gunning Fog, SMOG, Coleman–Liau, ARI) plus underlying text statistics for a given text.
- [Readability Syllable Counter](https://www.zero.xyz/c/readability-syllable-counter-e5c2f7f2/llms.txt): $0.002/call via x402. Counts syllables per word and in total across any given text string.

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)