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Polymarket Accuracy Score
x402
Polymarket Accuracy Score is a paid API for AI agents from the-stall.intuitek.ai, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).
Returns an accuracy or calibration score for Polymarket prediction market forecasts or participants
Price / call$0.004
Success—
StatusUnknown
How this service works
Historical Polymarket crowd accuracy score: % of markets where the final crowd majority correctly predicted the outcome, plus Brier score (calibration quality). Breakdowns by category — crypto, politics, sports, macro, equities, ai. Filter by category and lookback days. $0.004/call — 20% below closest x402 competitor. Source: Polymarket public API (no key required).
Output
A numeric accuracy or calibration score reflecting how well Polymarket predictions aligned with actual outcomes, potentially including breakdown metrics for the specified market or forecaster.
Example use cases
Example prompt
“Can you pull the accuracy score for Polymarket on the 2024 US election markets — I want to know how well-calibrated their crowd predictions turned out to be?”
Technical details
Endpoint
GEThttps://the-stall.intuitek.ai/cap/polymarket-accuracy-scoreWhen to prefer
Use this endpoint when you need a quantitative measure of Polymarket's forecasting accuracy or calibration for a specific market or participant, especially without wanting to manage API keys or accounts — paying $0.004 USDC per call via x402 on Base mainnet.
Side effects
- Unknown or invalid Polymarket market ID returns an error or empty result
- Market still open with no resolved outcome cannot be scored
- Insufficient data for scoring if market had very low volume
- Payment failure or insufficient USDC balance blocks the request
- Malformed input schema returns 400-level error
Input
{
"properties": "polymarket_accuracy_score"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
{
"brier_score": 0.0288,
"data_source": "Polymarket public API (gamma-api.polymarket.com)",
"period_days": 30,
"generated_at": "2026-06-21T05:19:58.955Z",
"interpretation": "Crowd was correct 96.6% of the time. Excellent calibration (Brier < 0.10).",
"sample_markets": [
{
"correct": true,
"outcome": "Down",
"category": "crypto",
"question": "XRP Up or Down - June 21, 1:00AM-1:15AM ET",
"crowd_prob": 0.07,
"volume_usd": 1242
},
{
"correct": true,
"outcome": "Down",
"category": "crypto",
"question": "XRP Up or Down - June 21, 1:10AM-1:15AM ET",
"crowd_prob": 0.1,
"volume_usd": 991
},
{
"correct": true,
"outcome": "Up",
"category": "crypto",
"question": "Dogecoin Up or Down - June 21, 1:10AM-1:15AM ET",
"crowd_prob": 0.99,
"volume_usd": 253
},
{
"correct": true,
"outcome": "Down",
"category": "equities",
"question": "Hyperliquid Up or Down - June 21, 1:00AM-1:15AM ET",
"crowd_prob": 0.16,
"volume_usd": 299
},
{
"correct": true,
"outcome": "Up",
"category": "crypto",
"question": "Dogecoin Up or Down - June 21, 1:00AM-1:15AM ET",
"crowd_prob": 0.999,
"volume_usd": 360
},
{
"correct": true,
"outcome": "Over",
"category": "other",
"question": "Trevor Rogers: Strikeouts O/U 1.5",
"crowd_prob": 0.999,
"volume_usd": 14
}
],
"markets_analyzed": 295,
"category_breakdown": [
{
"markets": 141,
"category": "crypto",
"brier_score": 0.0099,
"accuracy_pct": 99.3
},
{
"markets": 107,
"category": "other",
"brier_score": 0.0221,
"accuracy_pct": 98.1
},
{
"markets": 39,
"category": "equities",
"brier_score": 0.1084,
"accuracy_pct": 84.6
},
{
"markets": 7,
"category": "sports",
"brier_score": 0.0707,
"accuracy_pct": 85.7
},
{
"markets": 1,
"category": "politics",
"brier_score": 0,
"accuracy_pct": 100
}
],
"overall_accuracy_pct": 96.6
}Tags
x402
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