# 13F Institutional Holdings - Top Managers Leaderboard

> 13F Institutional Holdings - Top Managers Leaderboard is a paid API for AI agents from x402.professorsausages.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Returns the largest 13F institutional asset managers ranked by total reported portfolio value for a given quarter

## Facts

- Endpoint: GET https://x402.professorsausages.com/13f-holdings/top
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/13f-institutional-holdings-top-managers-leaderboard-a0008eb3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_21XTJfSiOPvM8VAypGpka

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 13f-institutional-holdings-top-managers-leaderboard-a0008eb3
```

Example prompt: Who were the top institutional asset managers by total 13F reported portfolio value last quarter — show me the leaderboard ranked by size?

## When to prefer this

Use this endpoint when you need a ranked leaderboard of the largest institutional investors by 13F-reported AUM for a specific quarter, particularly for competitive benchmarking, investor discovery, or identifying which major institutions to research further. Prefer this over individual holding lookups when you want a broad market-wide view of who the biggest players are rather than what a specific fund holds.

## Known failure modes

- Quarter not yet available or filings not yet processed — returns empty or stale data
- Invalid or missing quarter parameter — may return a default quarter or an error
- Rate limit or payment failure (x402) — HTTP 402 response requiring USDC payment
- No data for an obscure or future quarter — empty result set

## How this service works

Largest 13F managers for a quarter by total reported value — institutional leaderboard and discovery surface

## Output

A ranked list of the largest 13F institutional managers for the specified quarter, each with their name and total reported portfolio value, ordered from largest to smallest — functioning as an institutional investor discovery and benchmarking surface.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object"
  },
  "output": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/13f-institutional-holdings-top-managers-leaderboard-a0008eb3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.professorsausages.com](https://www.zero.xyz/host/x402.professorsausages.com/llms.txt)