{"uid":"cap_04XPyiAlVzBUsge2OpqWu","slug":"isin-check-digit-validator-b8c69190","name":"ISIN Check Digit Validator","description":"Validate a securities ISIN check digit and split it into country code and national security number.","url":"https://id-validators.x402tookit.com/isin-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 ISIN"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"nsin":{"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"]},"cusipIfUS":{"type":["null","string"]},"disclaimer":{"type":["null","string"]},"normalised":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"countryCode":{"type":["null","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_rS8ubFet03PI6-BzNWbJq","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 a securities ISIN and splits it into its country code and national security identifier number (NSIN).","exampleAgentPrompt":"Can you validate the ISIN US0378331005 — check its check digit, tell me if it's valid, and split out the country code and national security number?","exampleUseCases":[{"title":"Validate ISIN before trade submission","prompt":"Before I submit this order, check that the ISIN GB0002634946 is valid — verify the check digit and confirm the country code."},{"title":"Extract CUSIP from US ISIN","prompt":"I have the ISIN US5949181045 — can you validate it and pull out the underlying CUSIP from it?"},{"title":"Bulk data quality check on securities list","prompt":"I've got this ISIN DE0005140008 from our database — run a check digit validation on it and tell me if there are any problems with the format."}],"resultDescription":"Returns a verdict (valid/invalid), normalised ISIN string, country code, NSIN, CUSIP if the issuer is US-based, a summary of the validation outcome, an array of reasons if invalid, an asOf timestamp, and a disclaimer. The 'degraded' flag indicates if the check ran with reduced confidence.","failureModes":["Missing or empty 'id' query parameter returns an error","Malformed ISIN (wrong length or non-alphanumeric characters) returns invalid verdict with reasons","Network timeout or upstream service unavailability","Payment failure via x402 protocol results in 402 response before processing"],"whenToPreferThis":"Use this endpoint when you need to validate a specific ISIN's check digit and decompose it into its constituent parts (country code, NSIN, CUSIP for US securities). Prefer this over a generic format regex check when you need authoritative check-digit validation per the ISO 6166 algorithm.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T00:30:14.526Z","isFirstParty":false,"canonicalSlug":"isin-check-digit-validator-b8c69190"}