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HARS-Zero Signal API – Event Mispricing
x402
HARS-Zero Signal API – Event Mispricing is a paid API for AI agents from hars.cryptotavern.xyz, paid per call via x402, $0.026/call, status unknown (last checked 2026-09-13).
Detects mispriced prediction markets on Polymarket by identifying events where implied probabilities appear misaligned with expected value
Price / call$0.026
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 with a count of flagged events and an array of markets identified as mispriced, including relevant market identifiers and associated metadata. An empty markets array with count 0 means no mispricing detected under the current filter.
Example use cases
Spotting prediction market arbitrage opportunities
“Are there any mispriced Polymarket events I should know about today — specifically ones where the market odds seem way off from what's likely to happen?”
Pre-trade prediction market research
“Before I put money into any Polymarket contracts today, check for event mispricing signals and tell me which markets are flagged as inefficient.”
Daily prediction market intelligence briefing
“Give me a daily rundown of mispriced Polymarket events using the HARS-Zero signal — I want to see a count and the list of affected markets.”
Technical details
Endpoint
GEThttps://hars.cryptotavern.xyz/paid/event-mispricingWhen to prefer
Use this endpoint when you need to identify event-level pricing inefficiencies on Polymarket specifically, rather than fetching raw market data or general market summaries. Prefer this over generic Polymarket APIs when the goal is surfacing actionable mispricing signals for trading or research. Best suited for agents that pay per call in USDC via x402 and need lightweight, targeted intelligence rather than bulk data.
Side effects
- Empty result (count: 0, markets: []) when no mispricing is currently detected — not an error, just no signal
- Payment failure via x402 protocol if USDC balance is insufficient or wallet not configured
- Invalid or malformed properties filter parameter returning a 400-level error
- Stale data if Polymarket feed has not refreshed recently
- Timeout or 5xx if the upstream Polymarket data source is 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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