Locate a free open-access PDF for a DOI. Returns whether an open-access copy exists and the best PDF link with its license, version and host type, from Unpaywall and OpenAlex. A cheap, focused open-access locator.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.008000 USDC | 0xF22e...f493 |