{"uid":"cap_ovbf8Jw4kVc12_hu4hRvr","slug":"answerpool-busiest-filers-fbb2ae43","name":"AnswerPool Busiest Filers","description":"AnswerPool turns SEC EDGAR, the Federal Register, USAspending, NIH, BLS and OpenAlex into structured JSON answers that AI agents and developers fetch in one call. 69 endpoints free, no account; derived analyses $0.02–$0.05 per call by card credits or USDC (x402). MCP server, full provenance.","url":"https://answerpool.io/v1/sec/filings/top","method":"GET","headers":{},"bodySchema":{"type":"object","$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","title":"TopFilersIn","properties":{"days":{"type":"integer","title":"Days","default":90,"maximum":1830,"minimum":1,"description":"Length in days of the lookback window ending today, 1 to 1830, clamped at the start of index coverage. Default 90."},"form":{"anyOf":[{"type":"string","maxLength":12},{"type":"null"}],"title":"Form","default":null,"description":"Single EDGAR form type, matched exactly and case-insensitively (e.g. 8-K). Omit to count every form."},"limit":{"type":"integer","title":"Limit","default":25,"maximum":100,"minimum":1,"description":"Maximum filers to return, ranked by filing count in the window, highest first. Default 25."}},"additionalProperties":false}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"form":"D","as_of":"2026-08-31T16:30:00Z","filers":[{"cik":"0002150620","company":"Upfront Secondary II-C, L.P.","filings":3}],"index_to":"2026-08-28","index_from":"2021-07-01","window_days":90}},"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_pr2cvbXqR0psIjUTti8zj","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":"Ranks SEC EDGAR filers by filing volume over a configurable time window (up to 5 years), optionally filtered to a specific form type.","exampleAgentPrompt":"Show me the top 25 companies that filed the most Form D notices on SEC EDGAR over the last 365 days.","exampleUseCases":[{"title":"Spotting serial private placement issuers","prompt":"Who are the top 50 most frequent Form D filers on SEC EDGAR over the past two years? I want to find companies that are serial private placement raisers."},{"title":"Tracking heavy 8-K disclosure activity","prompt":"Give me the 25 companies that filed the most 8-Ks in the last 180 days — I'm looking for unusually active disclosers as a signal of corporate activity."},{"title":"Identifying prolific EDGAR registrants overall","prompt":"Rank the top 100 most active SEC EDGAR filers across all form types over the last 5 years — I want to see which companies or funds dominate filing volume historically."}],"resultDescription":"Returns a ranked list of filers with their CIK, company name, and filing count, plus metadata including the query window dates, as-of timestamp, form filter applied, and a disclaimer that the data is derived from public EDGAR filings and is not investment advice.","failureModes":["days parameter exceeds 1830 (5-year max) — validation error","limit exceeds 100 — validation error","Rare form type string yields zero results — empty filers array returned","Payment not processed (HTTP 402) — call blocked until $0.02 USDC payment is fulfilled","Stale index if EDGAR data ingestion lags — as_of timestamp will reflect last refresh"],"whenToPreferThis":"Choose this endpoint when you need a volume-ranked leaderboard of EDGAR filers for competitive intelligence, market surveillance, or identifying serial filers of a specific form type. It is more efficient than fetching and aggregating individual filing lists yourself. Prefer it over sibling endpoints like AnswerPool Form Trend (which gives market-wide monthly volume, not per-company rankings) or the 8-K item list endpoints (which filter by event type rather than ranking by filer).","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:55:43.392Z","isFirstParty":false}