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HARS-Zero Signal API – Alpha Feed
x402
HARS-Zero Signal API – Alpha Feed is a paid API for AI agents from hars.cryptotavern.xyz, paid per call via x402, $0.8/call, status unknown (last checked 2026-09-15).
Returns Polymarket prediction-market intelligence data (active markets, signals) for AI agents, gated by pay-per-call USDC payment via x402 protocol.
Price / call$0.8
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 matching markets and an array of market objects from the Polymarket prediction platform. Each market entry includes signal and intelligence data relevant to AI agent decision-making. Empty arrays indicate no matching markets for the given filter.
Example use cases
AI trading agent market scan
“Check the HARS-Zero alpha feed and list all the currently open Polymarket markets so my trading agent can decide which ones to take a position on.”
Election outcome probability lookup
“Use HARS-Zero to pull the latest Polymarket signals — I want to know what the current markets are saying about the upcoming election outcomes.”
Crypto price prediction market monitor
“Fetch the HARS-Zero alpha feed and show me any Polymarket markets related to crypto prices so I can see what traders are predicting.”
Technical details
Endpoint
GEThttps://hars.cryptotavern.xyz/paid/premium/alpha-feedWhen to prefer
Choose this endpoint when an AI agent needs real-time Polymarket prediction-market intelligence and is capable of paying per-call in USDC via the x402 protocol. Prefer it over free alternatives when premium alpha signals are needed for automated trading or decision-making agents operating on Base or Solana chains.
Side effects
- 402 Payment Required – x402 payment not included or insufficient USDC balance
- Empty markets array – no markets match the provided filter properties
- Invalid property filter schema – malformed input properties object
- Network timeout – upstream Polymarket data unavailable
- Rate limiting – too many calls in a short window
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "object",
"example": {
"count": 0,
"markets": []
}
}Tags
x402
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