readability.openverbs.com publishes 3 machine-payable endpoints over the x402 protocol, priced from $0.002 to $0.002 per call. Each was probed directly; the response code below is what it returned.
| Endpoint | Method | Price | Probe |
|---|---|---|---|
| /v1/grade | GET | $0.002 | 402 |
| /v1/reading-time | GET | $0.002 | 402 |
| /v1/score | GET | $0.002 | 402 |
Summarise a text's difficulty as a single consensus US grade level (averaging the five grade formulas), plus the Flesch Reading Ease, a plain-language difficulty band and an approximate age range.
Estimate reading and speaking time for a text at configurable words-per-minute rates (defaults: 200 wpm reading, 130 wpm speaking).
Compute the standard English readability formulas — Flesch Reading Ease, Flesch–Kincaid grade, Gunning fog, SMOG, Coleman–Liau and ARI — along with the underlying sentence/word/syllable statistics. Em…