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Polymarket Prediction Market Search
x402
Polymarket Prediction Market Search is a paid API for AI agents from finanz.halowerk.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Searches Polymarket for prediction markets matching a query and returns per-market implied probabilities, liquidity, 24-hour volume, bid-ask spread, and closing date with thin-market warnings.
Price / call$0.005
Success—
StatusUnknown
How this service works
Searches Polymarket for markets matching your terms and returns, per market, the implied probability of each outcome with the liquidity, 24-hour volume, bid-ask spread and closing date. The probability is the mid price and nothing more: on a market with little liquidity or a wide spread it says little, so both are returned next to it and a thin market is flagged rather than presented as a confident forecast.
Output
Returns a list of matching Polymarket markets, each containing: outcome names with implied mid-price probabilities, liquidity depth, 24-hour trading volume, bid-ask spread, market closing date, and a flag indicating whether the market is thin (low liquidity or wide spread) — with an explicit caveat that mid-price on thin markets is unreliable.
Example use cases
Election odds research
“Search Polymarket for markets about the 2026 US midterm elections and show me the implied probabilities for each outcome, plus liquidity and spread — I want to know which markets are thin.”
Macro event probability check
“What does Polymarket currently think the probability is of a US recession in 2025? Pull up the matching markets with their 24-hour volume and closing dates.”
Crypto regulatory outcome tracking
“Find prediction markets on Polymarket about a spot Ethereum ETF approval and give me the mid-price probability for each outcome alongside the bid-ask spread and liquidity.”
Technical details
Endpoint
POSThttps://finanz.halowerk.com/v1/prediction-marketsWhen to prefer
Use this endpoint when you need real-time crowd-sourced probability estimates from Polymarket for any event, especially when you also need liquidity and spread data to assess forecast reliability. Prefer this over news sentiment or model-based forecasts when you want market-implied probabilities with transparency about data quality. Especially useful for macro, geopolitical, crypto, and regulatory event research where Polymarket has active markets.
Side effects
- No markets found matching the search terms — returns empty result set
- Polymarket API unavailable or rate-limited — upstream error propagated
- Very broad query returns too many loosely related markets
- Thin-market flag raised but probability still returned — agent must interpret with caution
- Payment failure via x402 protocol — request rejected before execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| slug | string | Exact market slug, if known. |
| limit | integer | How many markets to return. |
| query | string | Search terms, e.g. "election" or "fed rate". Omit to list the most active markets. |
| active_only | boolean | Only markets still open for trading. |
| min_liquidity | number | Skip markets below this liquidity in USD. |
Tags
x402
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