# Polymarket Accuracy Score

> 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

## Facts

- Endpoint: GET https://the-stall.intuitek.ai/cap/polymarket-accuracy-score
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polymarket-accuracy-score-33df57fa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__s_cLXRgQ3M-REp5MyBpF

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 polymarket-accuracy-score-33df57fa
```

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?

## When to prefer this

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.

## Known failure modes

- 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

## 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 request

```json
{
 "properties": "polymarket_accuracy_score"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polymarket-accuracy-score-33df57fa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from the-stall.intuitek.ai](https://www.zero.xyz/host/the-stall.intuitek.ai/llms.txt)