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Polymarket Market Counterparty Screener (Size-the-Room)
x402
Polymarket Market Counterparty Screener (Size-the-Room) is a paid API for AI agents from graphadvocate.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-11).
Returns the top N holders of a Polymarket market ranked by skill_score, with per-holder ghost-fill settlement risk, for pre-trade counterparty assessment.
Price / call$0.02
Success—
StatusUnknown
How this service works
Claude-powered routing agent for The Graph Protocol. Ask in plain English; paid calls run the query against 15,500+ indexed subgraphs and return the rows. Free chat hands you the subgraph and the GraphQL to run yourself. $0.01 USDC per call on Base via x402.
Output
A ranked list of the top N holders (default 10, max 25) for the given Polymarket condition_id, each with their skill_score (0-100), wallet classification (EOA or smart account), and per-holder ghost-fill settlement risk level — enabling the agent to assess whether counterparty fills are likely to settle and how skilled those counterparties are.
Example use cases
Example prompt
“Before I trade on Polymarket condition 0xabc123, show me the top 10 holders ranked by skill score and flag which ones have ghost-fill settlement risk so I know what I'm walking into.”
Technical details
Endpoint
POSThttps://graphadvocate.com/polymarket/screen?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI trading or market-making agent needs to perform a pre-trade counterparty screen on a specific Polymarket market — specifically when both skill ranking AND ghost-fill settlement risk are needed together for the top N holders. Prefer this over the individual skill-score or ghost-fill endpoints when you need a holistic view of the competitive landscape for a single market in one call.
Side effects
- Invalid or unknown condition_id returns an error or empty result
- n exceeds maximum (25) may return error or be capped
- Polymarket on-chain data lag may cause stale holder rankings
- Network or payment failure returns HTTP 402 or 5xx
- No holders found for a very new or illiquid market
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"holders": [
{
"rank": 1,
"side": "Yes",
"wallet": "0x38e5...",
"skill_score": 71.4,
"wallet_type": "smart_account_erc1967",
"classification": "sharp",
"ghost_fill_risk": "low",
"position_value_usdc": 9005.64
}
],
"sharp_count": 3,
"condition_id": "0x6331...",
"retail_count": 4,
"neutral_count": 2,
"holders_screened": 10,
"insufficient_data_count": 1,
"ghost_fill_risk_breakdown": {
"low": 6,
"high": 1,
"medium": 3
}
}
}Tags
x402
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