validate-isbn x402 REST usage
ISBN-10 or ISBN-13 checksum validation (auto-detected by length).
0.001 USDC per call
per call
Book
3 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
book-by-isbn x402 REST
Book lookup by ISBN: title, authors, publish date, publisher, page count, subjects, cover image and Open Library link, from the free Open Library API. Cataloguing and citation data. $0.01 per lookup.
0.01 USDC per call
per call
has-book-schema x402 REST
Does the page declare schema.org Book structured data? Parses every JSON-LD block (and microdata itemtype attributes) on the page and returns whether a Book object is present, how many, and the Book object(s) themselves...
no price published