Isbn

Saylor Innovations Books x402 REST usage

Book search across 40M+ editions (Open Library) by keyword, author or subject, with ISBNs and covers

saylorinnovations.com Search & Research 3 calls / 30d checked 2026-10-26

0.01 USDC per call per call

ISBN check, validate an ISBN x402 REST usage

Check an ISBN-10 or ISBN-13 check digit and convert valid ISBN-10s to ISBN-13. Hyphens and spaces are ignored. Use before cataloguing or ordering books.

agent-data-tools.revmesh2074.workers.dev Infrastructure 3 calls / 30d checked 2026-10-26

0.01 USDC per call per call

eu-verify x402 REST usage

Latest-release metadata from the official PyPI JSON API (live): version, license, requires_python compatibility, requires_dist dependency specs (max 100), yanked flag, last upload time and project URLs. Query: ?pkg=reque...

data.greeneris.io Databases & Storage 10 calls / 30d checked 2026-10-26

0.002 USDC per call per call

Barcode & ISBN validator x402 REST usage

Validate EAN-8, EAN-13, UPC-A, GTIN-14, ISBN-10 and ISBN-13: check digit (and the expected one if wrong), code type, GS1 prefix and registering country, plus ISBN-10/13 conversion.

api.vextorium.com Dev & Code 5 calls / 30d checked 2026-10-26

0.003 USDC per call per call

ISBN validate x402 REST usage

Validate an ISBN-10 or ISBN-13 checksum (hyphens/spaces ignored) and report which format it is.

agent402.tools Other services 8 calls / 30d checked 2026-10-26

0.001 USDC per call per call

Isbn x402 REST usage

ISBN lookup: title, publisher, date, pages — Genesis402 / UnyKorn Operator Network

twin.unykorn.org Infrastructure 2 calls / 30d checked 2026-10-26

0.003 USDC per call per call

book-record x402 REST usage

Validate one ISBN checksum and return its Open Library edition, work and author records projected into one sourced CSL-JSON book item; invalid or absent ISBNs return an explicit refusal. The FOUR truth reading is true wh...

market.561.group Other services 3 calls / 30d checked 2026-10-26

0.002 USDC per call per call

Book Search x402 REST usage

Find books by title, author or ISBN (Open Library): authors, first publication year, editions, pages, ISBNs, subjects, publishers, languages, rating and cover image. Use for book lookups, reading lists or metadata.

bess-x402.onrender.com Search & Research 2 calls / 30d checked 2026-10-26

0.002 USDC per call per call

validate-isbn x402 REST usage

ISBN-10 or ISBN-13 checksum validation (auto-detected by length).

x402.agentindex.world Other services 3 calls / 30d checked 2026-10-26

0.001 USDC per call per call

Delx ISBN Check x402 REST checked

ISBN-10/ISBN-13 checksum validation for $0.001 USDC. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limitation: results cover only the...

api.delx.ai Crypto & Payments 2 calls / 30d checked 2026-10-24

0.001 USDC per call per call checked

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.

intel.rallylive.ca Media & Creative checked 2026-10-26

0.01 USDC per call per call

Barcode x402 REST

Barcode check digit validator in one GET: EAN-13, UPC-A, EAN-8, ISBN-10 and ISBN-13 — returns the symbology, the check digit it carries, the expected check digit and whether the number is valid. curl: GET /barcode?code=9...

x402-catalog-history.ai-business-surface.workers.dev Crypto & Payments checked 2026-10-26

0.001 USDC per call per call