# Polymarket Prediction Market Search

> 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.

## Facts

- Endpoint: POST https://finanz.halowerk.com/v1/prediction-markets
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polymarket-prediction-market-search-677920f4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eZW_jZfg50G_5BQgDwib3

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability polymarket-prediction-market-search-677920f4 -d '<json body>'
```

Example prompt: Search Polymarket for markets about a Federal Reserve interest rate cut in 2025 and tell me the implied probability of each outcome, along with the liquidity, 24-hour volume, and bid-ask spread — and flag any that look thin.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "slug": {
   "type": "string",
   "maxLength": 200,
   "description": "Exact market slug, if known."
  },
  "limit": {
   "type": "integer",
   "default": 8,
   "maximum": 25,
   "minimum": 1,
   "description": "How many markets to return."
  },
  "query": {
   "type": "string",
   "maxLength": 200,
   "description": "Search terms, e.g. \"election\" or \"fed rate\". Omit to list the most active markets."
  },
  "active_only": {
   "type": "boolean",
   "default": true,
   "description": "Only markets still open for trading."
  },
  "min_liquidity": {
   "type": "number",
   "minimum": 0,
   "description": "Skip markets below this liquidity in USD."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polymarket-prediction-market-search-677920f4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from finanz.halowerk.com](https://www.zero.xyz/host/finanz.halowerk.com/llms.txt)