# Octodamus Polymarket Odds

> Octodamus Polymarket Odds is a paid API for AI agents from api.octodamus.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Returns live Polymarket prediction-market data per market including normalized YES/NO implied probabilities, 24h volume, liquidity, CLOB order-book spread, and resolution status.

## Facts

- Endpoint: GET https://api.octodamus.com/v2/polymarket/odds
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/octodamus-polymarket-odds-3813ff04
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vfyCjhwwhXwVIFpcsxHEh

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 octodamus-polymarket-odds-3813ff04
```

Example prompt: What are the current Polymarket YES/NO odds and 24-hour volume for crypto prediction markets right now, including the order-book spread and liquidity?

## When to prefer this

Use this endpoint when you need live, normalized Polymarket prediction-market odds (implied probability) along with volume, liquidity, and CLOB spread data — especially when building crypto trading signals, sentiment analysis, or agent decision pipelines that incorporate crowd-sourced market probabilities as a data input.

## Known failure modes

- Missing or invalid PAYMENT-SIGNATURE header returns 402 Payment Required
- Expired or already-used payment signature returns authentication error
- Polymarket data temporarily unavailable returns 503 or timeout
- Malformed request returns 400 Bad Request
- Network or Base mainnet RPC issues may delay payment verification

## How this service works

Live crypto prediction-market facts from Polymarket: normalized YES/NO odds (implied probability), 24h volume, liquidity, CLOB order-book spread, and resolution status per market. Not a prediction.

## Output

A JSON object containing normalized YES/NO implied probabilities, 24h trading volume, liquidity depth, CLOB order-book spread, and resolution status for the queried Polymarket prediction market(s), plus a polymarket_edge object.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "method"
   ],
   "properties": {
    "method": {
     "type": "string",
     "const": "GET"
    },
    "headers": {
     "type": "object",
     "required": [
      "PAYMENT-SIGNATURE"
     ],
     "properties": {
      "PAYMENT-SIGNATURE": {
       "type": "string",
       "description": "x402 EIP-3009 USDC payment signature (Base mainnet)"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "action": {
     "enum": [
      "BUY",
      "SELL",
      "HOLD"
     ],
     "type": "string"
    },
    "signal": {
     "enum": [
      "BULLISH",
      "BEARISH",
      "NEUTRAL"
     ],
     "type": "string"
    },
    "btc_trend": {
     "enum": [
      "UP",
      "DOWN",
      "SIDEWAYS"
     ],
     "type": "string"
    },
    "reasoning": {
     "type": "string"
    },
    "confidence": {
     "type": "number",
     "maximum": 1,
     "minimum": 0
    },
    "fear_greed": {
     "type": "number",
     "maximum": 100,
     "minimum": 0
    },
    "polymarket_edge": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/octodamus-polymarket-odds-3813ff04/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.octodamus.com](https://www.zero.xyz/host/api.octodamus.com/llms.txt)