{"name":"sec-13f-api","description":"Track how institutional investors changed their stock positions between two SEC 13F-HR filings, no manual XML diffing required. Same 13f-deltas backend: given a CIK, it pulls the two most recent 13F-HR filings and diffs them into positions added, exited, increased, and reduced, each with dollar and share deltas. Send a CIK and an optional holdings limit; get back the delta lists ready for a fund-tracking dashboard or due-diligence workflow. Use it as a SEC 13F API, hedge fund position tracker, or institutional holdings delta feed.","price":"$0.05","method":"POST","input_schema":{"properties":{"cik":{"type":"string","description":"Institutional manager's SEC CIK (e.g. '0001067983' for Berkshire Hathaway). Required — 13F filings are by CIK only, no ticker."},"limit_holdings":{"type":"number","description":"Max positions to include in each bucket (added/exited/increased/reduced). 1-50. Default 20."},"min_change_usd":{"type":"number","description":"Filter out moves smaller than this dollar magnitude. Default 0 (no filter)."}},"required":["cik"]},"input_example":{"cik":"0001067983","limit_holdings":20},"output_example":{"cik":"0001067983","added":[],"increased":[],"reduced":[]},"x402_payment_required":true,"x402_facilitator":"https://api.cdp.coinbase.com/platform/v2/x402"}