# SiteCheck SEC 13F Holdings Lookup

> SiteCheck SEC 13F Holdings Lookup is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-16).

Fetches the latest SEC 13F-HR institutional equity holdings filing for a given fund or manager from EDGAR, returning a ranked list of stock positions with values, shares, and voting details.

## Facts

- Endpoint: GET https://api.sitecheck-api.workers.dev/api/sec/13f?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-sec-13f-holdings-lookup-02552271
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ko7do9NMnWCvli_s-DCZf

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sitecheck-sec-13f-holdings-lookup-02552271
```

Example prompt: Pull up Berkshire Hathaway's latest SEC 13F holdings from EDGAR — show me the top 20 positions ranked by market value, using their CIK 0001067983.

## When to prefer this

Use this endpoint when you need structured, machine-readable 13F institutional holdings data directly from SEC EDGAR without scraping. Prefer it over raw EDGAR HTML parsing when you need ranked, value-sorted positions with CUSIP identifiers and voting details for a specific fund. It is especially useful for hedge fund research, portfolio overlap analysis, or regulatory compliance checks where official SEC disclosure data is required.

## Known failure modes

- CIK not found: EDGAR returns no results for the given CIK, endpoint returns an error or empty holdings
- Ambiguous name match: when searching by name, the top EDGAR match may not be the intended filer
- Truncated results: filings with more holdings than the limit parameter will be flagged as truncated
- EDGAR downtime: if SEC EDGAR is unavailable, the lookup will fail
- Invalid limit value: limit outside 1–500 range may return an error or be clamped

## How this service works

Pay-per-call tools for AI agents: image generation, speech-to-text, text-to-speech, embeddings, LLM chat, website audits and contact enrichment, web page to Markdown reader, PDF to text, sitemap URLs, tech stack detection, translation, exchange rates, e-mail pre-check, domain RDAP/DNS lookup, Solana token checks, trending tokens and wallet holdings, plus business and compliance data (EU VAT/VIES, IBAN, LEI/GLEIF, US recalls, OSHA/EPA violations, UK insolvency notices). Also: SEO metadata, link checking, redirect chains, security headers, mail DNS (SPF, DMARC, DKIM), QR codes, language detection, photo EXIF, identifier validation, image OCR, SEC filings, SEC financials, Congress bills, macro rates, UK company data, GitHub repo stats, Hacker News, Wikipedia, gas prices, Solana swap quotes, ERC-20 token checks, ENS names, EVM wallet balances, EVM balances, transactions and contract calls, Solana transactions and accounts, crypto prices, candles and order books, DeFi TVL, yields and stablecoins, SEC insider trades, weather, geocoding and holidays, IP owners and postcodes, npm, PyPI and crates package data and vulnerabilities, GitHub profiles, arXiv papers and DOIs, structured extraction, summaries, sentiment and reranking, HTML tables and RSS feeds, Bitcoin fees, addresses and transactions, Bitcoin address balances, Bitcoin transaction status, EVM calldata decoding, verified EVM contracts, Hyperliquid perpetual markets, Hyperliquid account positions, Polymarket odds, crypto fear and greed, DeFi fees, DEX volume, company registries of four countries, ISIN, CUSIP and ticker lookup, SEC full-text search, SEC 8-K events, FDA drug labels, FDA adverse event counts, clinical trials, PubMed articles, US federal grants, EU public tenders, NPI provider lookup, US address geocoding, USGS earthquakes, NWS weather alerts, sunrise and moon times, time zone conversion, distance and bearing, GDACS disaster alerts, llms.txt checks, AI crawler access, tracker and cookie audits, certificate transparency, site logos and icons, GitHub releases, GitHub issues, Stack Overflow answers, read-only Wikidata queries, text moderation, image descriptions, text classification, named entity extraction, PII redaction, phone number checks, cron explanations, JSON Schema validation, whale transfers, SSL certificate expiry, Markdown to HTML, PageSpeed scores, Product Hunt launches, sanctions screening (OFAC, EU, UN, UK), flight fare search, YouTube transcripts, speech to text from media links, perpetual funding rates, crypto technical indicators, crypto news headlines, crypto spot conversion, World Bank macro indicators, loan and investment calculator, grammar checks, readability scores, keyword extraction, text diffs, transliteration and slugs, text chunking, subtitle translation, tone rewrites, working days, date calculations, unit conversion, book lookup, food nutrition, airport lookup, tide predictions, nearby places, robots.txt checks, hashes, encode and decode, JWT inspection, UUIDs and passwords, User-Agent parsing, subdomain discovery, uptime checks, VIN decoding, UK EORI checks, SWIFT and BIC checks, stock ticker lookup, invoice extraction, resume parsing, address parsing, prediction-market data, multi-chain RPC and chain data, compliance and government data, web data, search and research, AI text jobs. Plus prediction-market search, briefs, quotes and unsigned buy transactions, powered by Panta. Payment: x402, USDC on Base, Solana or Arc. No signup, no API key.

## Output

Returns structured JSON with the filer's name, CIK, EDGAR filing URL, filing date, reporting period end date, total portfolio value, and an array of holdings sorted by market value descending. Each holding includes the issuer name, CUSIP, share class, number of shares, reported USD value, share type, investment discretion, and voting authority breakdown. Also includes counts for total holdings and entries in the filing, plus a truncation flag and disclaimer.

## Request schema (JSON Schema)

```json
{
 "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": [],
     "properties": {
      "cik": {
       "type": "string",
       "description": "Filer CIK number (10-digit, with or without leading zeros)"
      },
      "name": {
       "type": "string",
       "description": "Filer name to search EDGAR (used when cik is not given; picks the top match)"
      },
      "limit": {
       "type": "string",
       "description": "Max holdings rows to return (1–500, default 100)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "cik": "0001067983",
  "note": "Rows are the filing's own entries, largest value first; one security can appear on several rows (different managers or voting authority).",
  "source": "SEC EDGAR (public domain) — https://www.sec.gov/cgi-bin/browse-edgar",
  "edgarUrl": "https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001067983&type=13F-HR&dateb=&owner=include&count=10",
  "holdings": [
   {
    "class": "COM",
    "cusip": "025816109",
    "issuer": "AMERICAN EXPRESS CO",
    "shares": 149061045,
    "putCall": null,
    "valueUsd": 50419898471,
    "shareType": "SH",
    "discretion": "DFND",
    "soleVoting": 149061045
   },
   {
    "class": "CAP STK CL A",
    "cusip": "02079K305",
    "issuer": "ALPHABET INC",
    "shares": 65824467,
    "putCall": null,
    "valueUsd": 23523689772,
    "shareType": "SH",
    "discretion": "DFND",
    "soleVoting": 65824467
   },
   {
    "class": "COM",
    "cusip": "037833100",
    "issuer": "APPLE INC",
    "shares": 80664820,
    "putCall": null,
    "valueUsd": 23341172315,
    "shareType": "SH",
    "discretion": "DFND",
    "soleVoting": 80664820
   }
  ],
  "checkedAt": "2026-10-15T18:21:06.473Z",
  "filerName": "BERKSHIRE HATHAWAY INC",
  "truncated": true,
  "disclaimer": "Information only, not legal advice. Verify with official sources.",
  "filingDate": "2026-08-14",
  "holdingsCount": 20,
  "totalValueUsd": 299253556246,
  "entriesInFiling": 89,
  "reportingPeriod": "2026-06-30",
  "totalValueSource": "cover page (tableValueTotal)"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-sec-13f-holdings-lookup-02552271/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.sitecheck-api.workers.dev](https://www.zero.xyz/host/api.sitecheck-api.workers.dev/llms.txt)