GRE and SAT vocabulary practice API: draws from 150 curated high-difficulty words — perspicacious, recalcitrant, ephemeral tier — each with definition, usage example, synonyms, and an advanced/expert rating so study agents can ramp difficulty as learners progress.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.002000 USDC | 0x8503...9432 |