# Polymarket Odds & Probability

> Polymarket Odds & Probability is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-17).

Queries Polymarket's prediction markets to return event outcome probabilities (Yes/No %), 24h volume, liquidity, and resolution date for a given topic or market slug.

## Facts

- Endpoint: GET https://402.com.tr/api/x402/polymarket-odds?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polymarket-odds-probability-53852f7c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ic8t4DARiS6g-New7DuUE

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-odds-probability-53852f7c
```

Example prompt: What are the current Polymarket odds on the Fed cutting rates this year — give me the Yes/No probabilities, 24h volume, and when the market resolves?

## When to prefer this

Use this endpoint when you need a real-time crowd-sourced probability signal from Polymarket's prediction markets before making a trading, hedging, or rebalancing decision. Prefer this over general news or sentiment APIs when you want a market-priced probability with liquidity data and a defined resolution date. Best suited for macro events, crypto milestones, regulatory decisions, and corporate events where Polymarket has active markets.

## Known failure modes

- No active markets found for the query — returns empty results or a not-found response
- Query too broad or ambiguous — may return unrelated markets
- Market recently resolved — endpoint may return stale or no data
- Gamma CLOB API unavailable — upstream timeout or error
- Rate limiting or payment failure — 402 payment required error

## How this service works

🆕 Queries Polymarket's Gamma CLOB for active prediction markets. Resolves event outcome probabilities (Yes/No %), 24h volume, liquidity, and resolution date in one call. Designed for AI agents that need a real-world reality check before trading, hedging, or rebalancing treasury. Pass query= (e.g. 'fed', 'btc', 'kraken-ipo-in-2025'). A probabilistic signal, not financial advice.

## Output

Returns active Polymarket prediction market data for the queried topic, including: Yes/No outcome probabilities (as percentages), 24-hour trading volume, available liquidity, resolution date, and the market question text. Multiple matching markets may be returned if several are active for the query.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "query"
     ],
     "properties": {
      "query": {
       "type": "string",
       "description": "Market topic, question or slug"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polymarket-odds-probability-53852f7c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 402.com.tr](https://www.zero.xyz/host/402.com.tr/llms.txt)