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HARS-Zero Historical Mispricing API
x402
HARS-Zero Historical Mispricing API is a paid API for AI agents from hars.cryptotavern.xyz, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-14).
Retrieves historical mispricing signals for Polymarket prediction markets, identifying past instances where market prices diverged from fair value
Price / call$0.04
Success—
StatusUnknown
How this service works
Polymarket prediction-market intelligence for AI agents. Pay-per-call in USDC via x402 protocol. Multi-chain: Base + Solana.
Output
Returns a JSON object containing a count of mispriced markets found and an array of market objects with historical mispricing details from Polymarket, indicating where market prices diverged from fair value over time.
Example use cases
Backtesting prediction market strategies
“I'm building a trading strategy for Polymarket — can you pull the historical mispricing data from HARS-Zero so I can see which markets consistently misprice and backtest whether fading the crowd would have been profitable?”
Identifying recurring market inefficiencies
“Which Polymarket prediction markets have historically shown the biggest mispricings? Pull the HARS-Zero historical mispricing signals so I can find recurring inefficiencies I should be watching.”
Pre-trade research on market quality
“Before I place a position on Polymarket, can you check the HARS-Zero historical mispricing data to see if this type of market has a track record of being efficiently priced or tends to diverge from true probabilities?”
Technical details
Endpoint
GEThttps://hars.cryptotavern.xyz/paid/historical-mispricing?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need historical intelligence on Polymarket prediction market mispricings specifically — ideal for backtesting, identifying recurring inefficiencies, or evaluating market quality before trading. Prefer this over real-time market data endpoints when the goal is pattern analysis of past price divergences rather than current signals.
Side effects
- Empty markets array returned if no historical mispricings match the filter criteria (count: 0)
- Payment failure via x402 protocol if USDC balance is insufficient or wallet not connected
- Invalid properties filter format may return empty results or an error
- Rate limiting or timeout if Polymarket data source is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "object",
"example": {
"count": 0,
"markets": []
}
}Tags
x402
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