Tools · Call
Validate an ISBN-10 (mod-11) or ISBN-13 (1,3-weight mod-10) checksum.
POST https://hcrb.in/v1/tools/isbn-check/call
0.005 USDC on Base · payTo 0xc59c85e661d34084a7769f955d17fd38254a6235
Status: unverified (probe-pending)
Settlement: direct to the seller's payTo — 0% HIVE402 take
Payment routes
Base · 0.005 USDC · payTo 0xc59c85e661d34084a7769f955d17fd38254a6235 · via guests · settles direct