# SiteCheck Polymarket Market Holders

> SiteCheck Polymarket Market Holders is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).

Returns the top share holders for each outcome of a given Polymarket prediction market condition

## Facts

- Endpoint: GET https://api.sitecheck-api.workers.dev/api/pm/holders?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-polymarket-market-holders-709ea1c1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2CLLMvWWEOeazJdh5zSyx

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 sitecheck-polymarket-market-holders-709ea1c1
```

Example prompt: Who are the top 10 holders for each outcome of the Polymarket market with condition ID 0xadebf2aec917971a733f74c66387529b3347ebf0f3019410427921d28e921beb?

## When to prefer this

Use this endpoint when you need to identify the largest position holders in a specific Polymarket prediction market outcome, assess holder concentration risk, track whale wallets, or analyze who controls the most shares. Prefer this over general DeFi holder lookups when the context is specifically Polymarket conditional markets identified by a 0x condition ID.

## Known failure modes

- Invalid or missing market condition ID returns an error
- Condition ID not found on Polymarket returns empty or error response
- Limit parameter out of range (>50 or <1) may return default or error
- Market with no holders or very new market may return empty holder arrays
- Polymarket Data API upstream outage causes failure

## How this service works

Pay-per-call tools for AI agents: image generation, speech-to-text, text-to-speech, embeddings, LLM chat, website audits and contact enrichment, web page to Markdown reader, PDF to text, sitemap URLs, tech stack detection, translation, exchange rates, e-mail pre-check, domain RDAP/DNS lookup, Solana token checks, trending tokens and wallet holdings, plus business and compliance data (EU VAT/VIES, IBAN, LEI/GLEIF, US recalls, OSHA/EPA violations, UK insolvency notices). Also: SEO metadata, link checking, redirect chains, security headers, mail DNS (SPF, DMARC, DKIM), QR codes, language detection, photo EXIF, identifier validation, image OCR, SEC filings, SEC financials, Congress bills, macro rates, UK company data, GitHub repo stats, Hacker News, Wikipedia, gas prices, Solana swap quotes, ERC-20 token checks, ENS names, EVM wallet balances, EVM balances, transactions and contract calls, Solana transactions and accounts, crypto prices, candles and order books, DeFi TVL, yields and stablecoins, SEC insider trades, weather, geocoding and holidays, IP owners and postcodes, npm, PyPI and crates package data and vulnerabilities, GitHub profiles, arXiv papers and DOIs, structured extraction, summaries, sentiment and reranking, HTML tables and RSS feeds, Bitcoin fees, addresses and transactions, Bitcoin address balances, Bitcoin transaction status, EVM calldata decoding, verified EVM contracts, Hyperliquid perpetual markets, Hyperliquid account positions, Polymarket odds, crypto fear and greed, DeFi fees, DEX volume, company registries of four countries, ISIN, CUSIP and ticker lookup, SEC full-text search, SEC 8-K events, FDA drug labels, FDA adverse event counts, clinical trials, PubMed articles, US federal grants, EU public tenders, NPI provider lookup, US address geocoding, USGS earthquakes, NWS weather alerts, sunrise and moon times, time zone conversion, distance and bearing, GDACS disaster alerts, llms.txt checks, AI crawler access, tracker and cookie audits, certificate transparency, site logos and icons, GitHub releases, GitHub issues, Stack Overflow answers, read-only Wikidata queries, text moderation, image descriptions, text classification, named entity extraction, PII redaction, phone number checks, cron explanations, JSON Schema validation, whale transfers, SSL certificate expiry, Markdown to HTML, PageSpeed scores, Product Hunt launches, sanctions screening (OFAC, EU, UN, UK), flight fare search, YouTube transcripts, speech to text from media links, perpetual funding rates, crypto technical indicators, crypto news headlines, crypto spot conversion, World Bank macro indicators, loan and investment calculator, grammar checks, readability scores, keyword extraction, text diffs, transliteration and slugs, text chunking, subtitle translation, tone rewrites, working days, date calculations, unit conversion, book lookup, food nutrition, airport lookup, tide predictions, nearby places, robots.txt checks, hashes, encode and decode, JWT inspection, UUIDs and passwords, User-Agent parsing, subdomain discovery, uptime checks, VIN decoding, UK EORI checks, SWIFT and BIC checks, stock ticker lookup, invoice extraction, resume parsing, address parsing, prediction-market data, multi-chain RPC and chain data, compliance and government data, web data, search and research, AI text jobs. Plus prediction-market search, briefs, quotes and unsigned buy transactions, powered by Panta. Payment: x402, USDC on Base, Solana, Arc, Polygon, Arbitrum, Monad, World Chain, Optimism, Avalanche, Celo or Stellar. No signup, no API key. Also RLUSD or XRP on the XRP Ledger.

## Output

A JSON object containing the market question, the condition ID, and an array of outcomes (e.g. Yes/No), each with a ranked list of top holders including their wallet address, display name (if set), number of shares held, and their share-of-listed fraction. Also includes total listed shares per outcome, source attribution, and a timestamp.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "market"
     ],
     "properties": {
      "limit": {
       "type": "string",
       "description": "Holders per outcome, 1 to 50, default 20"
      },
      "market": {
       "type": "string",
       "description": "Market condition id (0x + 64 hex), as returned by /api/pm/event"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "Top holders only (Polymarket Data API); shareOfListed is each wallet's share of the listed wallets' total, not of the whole supply.",
  "market": "0xadebf2aec917971a733f74c66387529b3347ebf0f3019410427921d28e921beb",
  "source": "Polymarket Data API (data-api.polymarket.com/holders), Gamma API for outcome names",
  "outcomes": [
   {
    "holders": [
     {
      "name": "DirkDiggler67",
      "shares": 4043.62,
      "wallet": "0xaab9f5e600a5dd88fe3a6f93313b180f6220a08d",
      "shareOfListed": 0.5402
     },
     {
      "name": "Gladius7",
      "shares": 1753.92,
      "wallet": "0xc9328e28eeb44978dbac9debb61ebc92931be6a5",
      "shareOfListed": 0.2343
     },
     {
      "name": "boomboomfan",
      "shares": 999.98,
      "wallet": "0x19f6874320fdcff817b576101698f086385668a9",
      "shareOfListed": 0.1336
     }
    ],
    "outcome": "Yes",
    "tokenId": "98961942092312242488092499568359433586418736677157512843097593070222397872380",
    "listedShares": 7485.05
   },
   {
    "holders": [
     {
      "name": null,
      "shares": 6021.5,
      "wallet": "0xa5ef39c3d3e10d0b270233af41cac69796b12966",
      "shareOfListed": 0.8475
     },
     {
      "name": "donthackme",
      "shares": 682.22,
      "wallet": "0x03805a13a0b3e058f55f6c6af95389d4f431073d",
      "shareOfListed": 0.096
     },
     {
      "name": "0x9495d622aB74a6O1AD1668D3DD4F7A2E68C3468F",
      "shares": 150.87,
      "wallet": "0x9495d622ab74a601ad1668d3dd4f7a2e68c3468f",
      "shareOfListed": 0.0212
     }
    ],
    "outcome": "No",
    "tokenId": "25577426275690684616716071555342531409633887290855150098579283222918527885031",
    "listedShares": 7104.6
   }
  ],
  "question": "Will Alexandria Ocasio-Cortez run for President in 2028?",
  "checkedAt": "2026-10-15T18:21:04.633Z",
  "disclaimer": "Information only, not financial advice."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-polymarket-market-holders-709ea1c1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.sitecheck-api.workers.dev](https://www.zero.xyz/host/api.sitecheck-api.workers.dev/llms.txt)