{"uid":"cap_-xCfYoVvZuxRdl-p7pjif","slug":"gstin-format-validator-70150863","name":"GSTIN Format Validator","description":"GSTIN format validation: state code, embedded PAN, entity type, Luhn-mod-36 checksum.","url":"https://verifyapi.hillguava.xyz/verify/gstin-format/:gstin","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","HEAD","DELETE"],"type":"string"},"pathParams":{"type":"object","required":["gstin"],"properties":{"gstin":{"type":"string","description":"15-character GSTIN, e.g. 27AAPFU0939F1ZV"}}},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_PvUOPgzjZMNgaii64F6T_","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Validates the format of a 15-character Indian GSTIN by checking state code, embedded PAN, entity type, and Luhn-mod-36 checksum","exampleAgentPrompt":"Can you check if this GSTIN is valid: 27AAPFU0939F1ZV? I want to know if the state code, PAN, entity type, and checksum all check out before I use it on an invoice.","exampleUseCases":null,"resultDescription":"Returns a structured validation result indicating whether the 15-character GSTIN passes format checks, including whether the embedded state code is valid, the PAN segment is correctly formed, the entity type character is recognized, and the Luhn-mod-36 checksum is correct.","failureModes":["GSTIN not exactly 15 characters — returns format error","invalid state code prefix — flagged in response","malformed PAN segment in characters 3–12 — validation fails","unrecognized entity type character at position 13 — flagged","checksum mismatch (Luhn-mod-36 failure) — returns invalid","payment not provided or insufficient — HTTP 402 returned"],"whenToPreferThis":"Use this endpoint when you need lightweight, offline-style format validation of a GSTIN before submitting it to a government API or using it on a tax invoice. It checks structural correctness (state code, PAN, entity type, checksum) without making a live lookup against the GST portal — ideal for fast pre-validation in form submissions or data pipelines.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:38:14.167Z","isFirstParty":false}