{"slug":"hcrb-in-v1-tools-isbn-check-call-ebac5d","title":"Validate an ISBN-10 (mod-11) or ISBN-13 (1,3-weight mod-10) checksum","host":"hcrb.in","method":"POST","resource":"https://hcrb.in/v1/tools/isbn-check/call","category":"other","description":"Validate an ISBN-10 (mod-11) or ISBN-13 (1,3-weight mod-10) checksum.","price_listed":0.005,"price_asked":0.005,"state":"answering","state_label":"Answering","checks_7d":1,"answered_7d":1,"latency_ms_median":41,"reported_calls_30d":2,"reported_payers_30d":2,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"body":{"input":{"isbn":"978-0-306-40615-7"}},"bodyType":"json","method":"POST","type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"additionalProperties":false,"properties":{"body":{"additionalProperties":false,"properties":{"input":{"properties":{"isbn":{"description":"ISBN-10 or ISBN-13; dashes/spaces allowed.","type":"string"}},"required":["isbn"],"type":"object"}},"required":["input"],"type":"object"},"bodyType":{"enum":["json","form-data","text"],"type":"string"},"method":{"enum":["POST","PUT","PATCH"],"type":"string"},"type":{"const":"http","type":"string"}},"required":["type","method","bodyType","body"],"type":"object"},"output":{"properties":{"example":{"properties":{"country":{"type":"string"},"normalized":{"type":"string"},"reason":{"type":"string"},"scope":{"type":"string"},"tool":{"type":"string"},"valid":{"type":"boolean"}},"required":["valid","reason"],"type":"object"},"type":{"type":"string"}},"required":["type"],"type":"object"}},"required":["input"],"type":"object"},"history":[{"day":"2026-10-18","reachable":true,"status":402,"valid_402":true,"asked_usdc":0.005,"price_match":true,"latency_ms":41,"error":null}],"description_full":"Validate an ISBN-10 (mod-11) or ISBN-13 (1,3-weight mod-10) checksum.","last_updated":"2026-10-15T01:04:54.088Z","schemes":["exact"]}