# 13F Portfolio Holdings Changes (Quarter-over-Quarter)

> 13F Portfolio Holdings Changes (Quarter-over-Quarter) is a paid API for AI agents from api.agentstools.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns quarter-over-quarter changes in an institutional manager's 13F portfolio, bucketing each position as new, added, reduced, sold out, or unchanged, with share/dollar deltas and a net flow summary.

## Facts

- Endpoint: GET https://api.agentstools.dev/holdings/changes
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/13f-portfolio-holdings-changes-quarter-over-quarter-229cbb8a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ypyDVR4xZBXCpzM7CvDO1

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-portfolio-holdings-changes-quarter-over-quarter-229cbb8a
```

Example prompt: Show me all the quarter-over-quarter 13F portfolio changes for Appaloosa Management — I want to see which positions they added, reduced, sold out of, or initiated new, with the share and dollar deltas, for their latest filing.

## When to prefer this

Use this endpoint when you need a structured diff of an institutional manager's 13F portfolio between two consecutive quarters — specifically when you want per-position change classification (new/added/reduced/sold/unchanged) with numeric deltas, rather than a raw snapshot of current holdings. Prefer over raw 13F snapshot endpoints when the user's intent is change detection, trend analysis, or identifying entry/exit decisions by a fund.

## Known failure modes

- CIK not found in SEC EDGAR — returns error if CIK is invalid or not a 13F filer
- Manager name not resolvable — best-effort name resolution may fail; recommend supplying CIK directly
- No consecutive 13F filings available for the requested quarter — returns error if only one or zero filings exist
- Invalid quarter date format — must be ISO YYYY-MM-DD matching a valid quarter-end date
- Payment failure — x402 micropayment not completed, request rejected

## How this service works

Quarter-over-quarter change of an institutional manager's Form 13F portfolio. Give a CIK or name and get every position bucketed as new, added, reduced, sold out or unchanged, with per-position share and dollar deltas and a net flow summary, from two consecutive 13F filings, cited to both.

## Output

A structured JSON object listing every 13F position bucketed as new, added, reduced, sold out, or unchanged, with per-position share count and dollar value deltas, a net flow summary, and citations to both consecutive 13F filings used for the comparison.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "cik": {
       "type": "string",
       "description": "SEC EDGAR filer CIK, any zero-padding accepted"
      },
      "name": {
       "type": "string",
       "description": "Manager name (best-effort resolve; supply cik if not found)"
      },
      "quarter": {
       "type": "string",
       "description": "Quarter period-end date, ISO YYYY-MM-DD (default latest)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/13f-portfolio-holdings-changes-quarter-over-quarter-229cbb8a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.agentstools.dev](https://www.zero.xyz/host/api.agentstools.dev/llms.txt)