{"uid":"cap_dA8Q56sn7SXLIj5XvW44O","slug":"issn-validator-and-formatter-2ad985fa","name":"ISSN Validator and Formatter","description":"Validate an ISSN (journal or serial number) check digit and format it with the hyphen.","url":"https://id-validators.x402tookit.com/issn-check?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["id"],"properties":{"id":{"type":"string","description":"The ISSN"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"source":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"formatted":{"type":["null","string"]},"disclaimer":{"type":["null","string"]},"normalised":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_eiZQDWAVofd1aAWX-O9ux","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates the check digit of an ISSN (International Standard Serial Number) and returns it formatted with the standard hyphen separator.","exampleAgentPrompt":"Can you check whether the ISSN 1234-5670 is valid and give me the correctly hyphenated format?","exampleUseCases":[{"title":"Journal metadata validation pipeline","prompt":"I'm ingesting a batch of academic journal records and need to verify that the ISSN 0028-0836 has a valid check digit and is properly formatted — can you check it?"},{"title":"Publishing submission form check","prompt":"A user just submitted ISSN 03784266 on our submission form — can you validate its check digit and tell me what the correctly hyphenated version should be?"},{"title":"Library catalog data cleanup","prompt":"We have the serial number 17518630 in our catalog without a hyphen — is it a valid ISSN and what's the standard formatted version?"}],"resultDescription":"Returns a verdict (valid/invalid), a formatted ISSN string with hyphen, a normalised form, human-readable reasons explaining the validation outcome, a summary, and optional disclaimer and source metadata.","failureModes":["Invalid or missing 'id' query parameter returns an error response","ISSN with wrong number of digits fails validation with reasons explaining the format issue","Incorrect check digit causes verdict to be invalid with explanation","Non-numeric characters in unexpected positions cause format validation failure","Network or service unavailability may result in HTTP errors"],"whenToPreferThis":"Choose this endpoint when you specifically need to validate and format an ISSN (8-digit serial publication identifier). It is purpose-built for ISSN check-digit verification using the standard mod-11 algorithm, distinct from ISBN (books), ISIN (securities), LEI, or other identifier types handled by sibling endpoints on the same service.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T13:11:14.052Z","isFirstParty":false,"canonicalSlug":"issn-validator-and-formatter-2ad985fa"}