# x402-factory EDGAR 13F Holdings Diff

> x402-factory EDGAR 13F Holdings Diff is a paid API for AI agents from x402-factory.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).

Returns a quarter-over-quarter diff of a hedge fund or institutional investor's 13F holdings by CIK, showing what positions were added, removed, or changed

## Facts

- Endpoint: GET https://x402-factory.com/v1/edgar/13f/%7Bcik%7D/diff
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-factory-edgar-13f-holdings-diff-d3722238
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W7dsE12p23xlZj4Kq-VZ9

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 x402-factory-edgar-13f-holdings-diff-d3722238
```

Example prompt: Pull the latest 13F holdings diff for Berkshire Hathaway — CIK 0001067983 — and tell me what positions they added, removed, or meaningfully changed compared to last quarter.

## When to prefer this

Choose this endpoint when you need machine-readable, pre-computed quarter-over-quarter diffs of SEC 13F filings for a specific institutional filer identified by CIK. It is ideal for AI agents that need to detect hedge fund portfolio changes, track activist investors, or monitor institutional sentiment without parsing raw EDGAR XML. Prefer this over raw EDGAR access when you need normalized, diff-ready data with a simple per-call pricing model via x402/USDC.

## Known failure modes

- Invalid or unknown CIK returns a 404 or empty result
- CIK exists but filer has not submitted a 13F (e.g. non-institutional filer) returns empty or error
- Payment not included returns HTTP 402 with USDC/Base payment requirements
- Rate limiting or network timeout if retried too quickly
- No prior quarter filing available for diff — only one filing on record — returns incomplete diff or error
- EDGAR data lag: most recent quarter may not yet be processed

## How this service works

Paid data APIs for AI agents: prediction-market analytics, weather intelligence, weather×market edge signals, and SEC/gov data. Paid endpoints use the x402 protocol (HTTP 402 + USDC on Base): call without payment to receive requirements, retry with an X-PAYMENT header. Machine-readable catalog: /llms.txt. Per-endpoint docs: /docs/{id}.

## Output

A structured diff of the fund's 13F SEC filing compared to the prior quarter, listing securities added (new positions), removed (exited positions), and changed (increased or decreased size), keyed by CIK. Each entry typically includes the security name, CUSIP or ticker, prior holding size, current holding size, and the delta.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-factory-edgar-13f-holdings-diff-d3722238/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-factory.com](https://www.zero.xyz/host/x402-factory.com/llms.txt)