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HARS-Zero Signal API – Historical Momentum
x402
HARS-Zero Signal API – Historical Momentum is a paid API for AI agents from hars.cryptotavern.xyz, paid per call via x402, $0.051/call, status unknown (last checked 2026-09-14).
Returns historical momentum signals for Polymarket prediction markets, helping AI agents identify trending or momentum-driven markets
Price / call$0.051
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 matched markets and an array of market objects with historical momentum signal data from Polymarket, indicating which markets have notable momentum characteristics.
Example use cases
Momentum-based trading signal research
“I want to see which Polymarket prediction markets have been building the most momentum historically — can you pull the HARS-Zero historical momentum data and list the top markets?”
Pre-trade market selection for prediction markets
“Before I place a bet on Polymarket, show me the markets with strong historical momentum signals so I can focus on the ones with the clearest directional trend.”
Automated prediction market monitoring
“Check the HARS-Zero historical momentum endpoint and alert me if any Polymarket markets are showing unusual momentum buildup compared to their historical baseline.”
Technical details
Endpoint
GEThttps://hars.cryptotavern.xyz/paid/historical-momentumWhen to prefer
Choose this endpoint when you need historical momentum signals specifically from Polymarket prediction markets and want a pay-per-call model with no subscription commitment. Prefer this over direct Polymarket API access when you need pre-processed momentum analytics rather than raw market data.
Side effects
- Empty markets array with count 0 if no markets match the provided filter criteria
- Payment failure via x402 protocol if USDC balance is insufficient
- HTTP 402 if payment is not included or invalid
- Rate limiting or timeout if the upstream Polymarket data source is unavailable
- Malformed input properties may result in no results rather than an explicit error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "object",
"example": {
"count": 0,
"markets": []
}
}Tags
x402
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