finance.thirteen-f

Parsed institutional holdings from a 13F-HR filing. By investment-manager CIK (e.g. 1067983 = Berkshire Hathaway). Returns each holding's nameOfIssuer, cusip, market value (whole USD per the modern Form 13F convention), shares/principal amount + type, putCall flag for options, and voting authority (sole/shared/none). Sorted by value descending. Pass formType for amendments (13F-HR/A) or non-filings (13F-NT). Backed by SEC.gov; underlying 13F filings are public records.

price

$0.0072 USDC per call

method

GET/api/finance/thirteen-f

payment

x402 v2 · USDC on Base (EIP-3009) or Solana (SPL transfer)

auth

None. Sign the payment, retry with PAYMENT-SIGNATURE.

tier

Tier 0 — no paid upstream

Parameters

Name	Type	Description
`managerCik`required	string	Investment manager's CIK (numeric). Berkshire Hathaway=1067983, Renaissance=1037389, Bridgewater=1350694, Vanguard=102909, BlackRock=1364742. min 1 chars · max 10 chars · match ^\d+$
`formType`	string	13F filing variant. Default 13F-HR (original report). Use 13F-HR/A for amendments, 13F-NT for notice of non-filings. min 3 chars · max 20 chars · match ^13F-[A-Z/]{2,10}$
`limit`	integer	Max holdings to return, sorted by value descending. (1-200). Default 25. min 1 · max 200

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/finance/thirteen-f?managerCik=12345&formType=13F-HR&limit=25'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/finance/thirteen-f?managerCik=12345&formType=13F-HR&limit=25' \
  -H 'PAYMENT-SIGNATURE: <base64-json-payload>'

# Or use the canonical runner (handles probe → sign → retry):
#   EVM_PRIVATE_KEY=0x... node --env-file=.env.local \
#     --experimental-strip-types scripts/x402-pay.ts \
#     'https://2s.io/api/finance/thirteen-f?managerCik=12345&formType=13F-HR&limit=25'

TypeScript / Node — @2sio/sdktypescript

import { TwoS } from '@2sio/sdk'

const client = new TwoS({
  privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})

const result = await client.finance.thirteenF({
  "managerCik": "12345",
  "formType": "13F-HR",
  "limit": 25
})

console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)

Python — 2siopython

import os
from twosio import TwoS

client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])

result = client.finance.thirteen_f(managerCik="12345", formType="13F-HR", limit=25)

print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)

MCP — Claude Desktop / AgentKit / any MCP hostjson

// 1. Add @2sio/mcp to your MCP host config (Claude Desktop example below).
//    EVM_PRIVATE_KEY funds x402 payments per call.

// claude_desktop_config.json
{
  "mcpServers": {
    "2sio": {
      "command": "npx",
      "args": ["-y", "@2sio/mcp"],
      "env": { "EVM_PRIVATE_KEY": "0x..." }
    }
  }
}

// 2. Once the server is running, agents call this tool via standard MCP:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "finance.thirteen-f",
    "arguments": {
      "managerCik": "12345",
      "formType": "13F-HR",
      "limit": 25
    }
  }
}

Response

Field	Type	Description
`query`	object
`cik`	string
`managerName`	string
`filing`	object
`totalValueUsd`	number
`totalPositions`	integer
`returned`	integer
`holdings`	array
`source`	object

Example response datajson

{
  "query": {
    "managerCik": "example",
    "formType": "example",
    "limit": 1
  },
  "cik": "example",
  "managerName": "example",
  "filing": {
    "accessionNumber": "example",
    "form": "example",
    "filingDate": "example",
    "periodOfReport": "example",
    "infoTableUrl": "https://example.com",
    "documentUrl": "https://example.com"
  },
  "totalValueUsd": 1,
  "totalPositions": 1,
  "returned": 1,
  "holdings": [
    {
      "nameOfIssuer": "example",
      "titleOfClass": "example",
      "cusip": "example",
      "valueUsd": 1,
      "sharesOrPrinAmt": 1,
      "sharesOrPrinAmtType": "SH",
      "investmentDiscretion": "example",
      "putCall": "PUT",
      "votingAuthority": {
        "sole": 1,
        "shared": 1,
        "none": 1
      }
    }
  ],
  "source": {
    "provider": "example",
    "url": "https://example.com",
    "license": "example"
  }
}

Discovery

/api/directory — full catalog of every endpoint
/openapi.json — OpenAPI 3.1 spec (per-op x-payment-info, x402Payment security)
/.well-known/x402 — machine-readable service descriptor for x402-aware crawlers
/.well-known/mcp/server-card.json — MCP SEP-1649 server card
/llms.txt — plain-text manifest for LLM ingestion

2s.io is x402-native. Every call is paid per-request from a USDC-funded EVM wallet on Base — no signup, no API keys, no monthly fees. Source code: github.com/2s-io/sdk.