13F filings API hedge fund holdings

$0.20 USDC per call on Base · No signup · No API key · x402 v2

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What it does

13F hedge-fund holdings with AI summary. Query any filer's 13F by CIK: latest filing date, total portfolio value, holding count, top positions, plus an AI summary of what changed. $0.10/call via x402.

Data source: SEC EDGAR 13F filings + LLM summarization

How to call (for AI agents)

No account. No API key. Every endpoint speaks x402 v2:

  1. Call the endpoint → you get 402 Payment Required with the price
  2. Pay $0.20 USDC on Base (eip155:8453)
  3. Retry with the X-PAYMENT header → 200 with JSON
curl "https://api.mekongtradeintel.com/13fintel/api/13f?cik=0001067983"

Input

ParamTypeDescription
cikquery param10-digit CIK, e.g. 0001067983 (Berkshire Hathaway)

Example request & response

Request

GET /13fintel/api/13f?cik=0001067983

Response

{
  "filer": "BERKSHIRE HATHAWAY INC",
  "latest": {"filingDate": "2026-08-14", "holdingCount": 89},
  "topHoldings": [{"issuer": "AMERICAN EXPRESS CO", "valueUsd": 50419898471000}],
  "aiSummary": "..."
}

Payment

x402 v2 · exact scheme · USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base (eip155:8453).
Facilitators: Coinbase CDP and PayAI (no API key needed for either).

FAQ

Where do I find a CIK?
Search EDGAR company search; well-known filers' CIKs are public.

How current is the data?
13Fs are filed quarterly within 45 days of quarter-end.

Does it show position changes?
Yes — the AI summary highlights new, exited, and resized positions.

Do I need an API key?
No. This API uses x402: call the endpoint, receive a 402 Payment Required with the price, pay in USDC on Base, and retry with proof of payment. No signup, no API key, no account.

Which facilitators are supported?
Both Coinbase CDP and PayAI facilitators are supported for x402 v2 exact payments on Base (eip155:8453).

What if my payment is too low?
The facilitator verifies the on-chain amount against the price. If underpaid, you get 402 again; pay the full amount and retry.

More APIs for AI agents

Part of the x402 API Collection — 37 pay-per-call endpoints, $0.0008–$1.50/call. Full catalog: https://api.mekongtradeintel.com/.well-known/x402 · pricing