{"uid":"cap_bOJR8lVmfhSpe5i9m5GvS","slug":"api-cryptoetfsentinel-com-ef70aaac","name":"Crypto ETF Sentinel — SEC Comment-Letter History by Issuer CIK","description":"Crypto ETF Sentinel — Full SEC ↔ issuer comment-letter history for one US spot crypto ETF issuer: UPLOAD/CORRESP pairs in order with a review-intensity profile. Comment-letter cadence is a leading indicator of approval proximity. Use when assessing how far along one filing's SEC review is. Pass the issuer's SEC CIK as cik.","url":"https://api.cryptoetfsentinel.com/v1/issuers/comment-letters","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":[],"properties":{"cik":{"type":"string","pattern":"^[0-9]{1,10}$","description":"Zero-padded SEC CIK identifier (e.g. ``0001980994``). Optional — pass one to target a specific issuer (discover CIKs via /v1/issuers); omit to get the largest issuer by AUM."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","required":["data"],"properties":{"data":{"description":"The endpoint payload — type varies per route"},"meta":{"type":"object","properties":{"limit":{"type":["integer","null"]},"total":{"type":["integer","null"]},"offset":{"type":["integer","null"]}}},"error":{"type":["string","null"]}}}}}}},"responseSchema":null,"example":{"request":{"input":{"type":"http","method":"GET","queryParams":{"cik":"0001980994"}}},"response":{"data":{"letters":[{"cik":"0001980994","company":"iShares Bitcoin Trust ETF","accession":"0001437749-25-023942","form_type":"CORRESP","file_number":null,"filing_date":"2025-07-30","crypto_relevant":1},{"cik":"0001980994","company":"iShares Bitcoin Trust ETF","accession":"0001437749-25-015854","form_type":"CORRESP","file_number":null,"filing_date":"2025-05-09","crypto_relevant":1},{"cik":"0001980994","company":"iShares Bitcoin Trust ETF","accession":"0000000000-25-001570","form_type":"UPLOAD","file_number":"333-272680","filing_date":"2025-02-12","crypto_relevant":1},{"cik":"0001980994","company":"iShares Bitcoin Trust ETF","accession":"0001437749-24-001046","form_type":"CORRESP","file_number":null,"filing_date":"2024-01-09","crypto_relevant":1},{"cik":"0001980994","company":"iShares Bitcoin Trust ETF","accession":"0001437749-24-000954","form_type":"CORRESP","file_number":null,"filing_date":"2024-01-09","crypto_relevant":1},{"cik":"0001980994","company":"iShares Bitcoin Trust ETF","accession":"0001437749-24-000919","form_type":"CORRESP","file_number":null,"filing_date":"2024-01-09","crypto_relevant":1},{"cik":"0001980994","company":"iShares Bitcoin Trust ETF","accession":"0000000000-24-000277","form_type":"UPLOAD","file_number":"333-272680","filing_date":"2024-01-08","crypto_relevant":1},{"cik":"0001980994","company":"iShares Bitcoin Trust ETF","accession":"0001437749-24-000788","form_type":"CORRESP","file_number":null,"filing_date":"2024-01-08","crypto_relevant":1},{"cik":"0001980994","company":"iShares Bitcoin Trust ETF","accession":"0000000000-24-000181","form_type":"UPLOAD","file_number":"333-272680","filing_date":"2024-01-05","crypto_relevant":1},{"cik":"0001980994","company":"iShares Bitcoin Trust ETF","accession":"0001437749-23-035560","form_type":"CORRESP","file_number":null,"filing_date":"2023-12-29","crypto_relevant":1},{"cik":"0001980994","company":"iShares Bitcoin Trust ETF","accession":"0001437749-23-035272","form_type":"CORRESP","file_number":null,"filing_date":"2023-12-22","crypto_relevant":1},{"cik":"0001980994","company":"iShares Bitcoin Trust 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ETF","accession":"0000000000-23-010822","form_type":"UPLOAD","file_number":"333-272680","filing_date":"2023-09-29","crypto_relevant":1}],"review_profile":{"uploads":5,"last_letter":"2024-01-09","first_letter":"2023-09-29","approval_date":"2024-01-10T00:00:00","review_rounds":5,"review_status":"approved","correspondences":9,"withdrawal_date":null,"registration_date":"2023-06-15T00:00:00","review_duration_days":102,"days_since_last_letter":872}},"meta":{"note":null,"page":null,"limit":null,"total":null,"offset":null,"full_count":null},"error":null}},"exampleRequest":{"cik":"0001980994"},"tags":["x402"],"displayCostAmount":"0.05","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_bTm0_EemsKMcwztHWXch3","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the full chronological SEC ↔ issuer comment-letter history (UPLOAD/CORRESP pairs with review-intensity classification) for a single US spot crypto ETF issuer identified by SEC CIK.","exampleAgentPrompt":"Pull the full SEC comment-letter history for the crypto ETF issuer with CIK 0001980994 — I want to see all the UPLOAD and CORRESP pairs in order and their review-intensity classifications to gauge how close they are to approval.","exampleUseCases":null,"resultDescription":"A chronological list of UPLOAD/CORRESP comment-letter pairs exchanged between the SEC and the issuer, each annotated with a review-intensity classification, giving a leading indicator of the issuer's proximity to ETF approval.","failureModes":["Invalid or non-numeric CIK returns a 400 validation error","CIK not found in SEC EDGAR returns empty results or 404","CIK exists but has no comment letters on record — returns empty array","Payment not included or insufficient — returns 402 Payment Required","Rate limiting or server overload — returns 429 or 503"],"whenToPreferThis":"Use this endpoint when you need the full regulatory correspondence timeline for a specific US spot crypto ETF issuer and want to assess approval likelihood based on comment-letter cadence and review intensity. Prefer this over the activity feed endpoint when you need exhaustive per-issuer historical depth rather than a broad recent-activity snapshot.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:39:15.545Z","isFirstParty":false}