# Polymarket Live Prediction Market Odds & Implied Probability Feed

> Polymarket Live Prediction Market Odds & Implied Probability Feed is a paid API for AI agents from preflight.agentdiet.dev, paid per call via MPP, $0.015/call, status unknown (last checked 2026-10-21).

Fetches live Polymarket orderbook data, implied Yes/No probabilities, volume, and whale sentiment for any macro, crypto, or AI prediction market event.

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/polymarket-odds?utm_source=zero.xyz
- Price: $0.015/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: preflight.agentdiet.dev
- Website: https://preflight.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/preflight-agentdiet-dev-polymarket-live-prediction-market-odds-1f4a176d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hRGfyPleakAQ_gAIZHF4z

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 preflight-agentdiet-dev-polymarket-live-prediction-market-odds-1f4a176d
```

Example prompt: What are the live Polymarket odds and implied Yes/No probabilities for the Fed cutting interest rates at the next FOMC meeting?

## When to prefer this

Choose this endpoint when you need real-time crowd-sourced probability estimates from Polymarket's prediction market for macro, crypto, political, or AI events. It is ideal for agents that need market-implied odds rather than model-based forecasts, or that want to gauge speculative sentiment and whale positioning on a specific event outcome. Prefer this over generic news or sentiment APIs when you need a quantified probability with associated trading volume as a confidence signal.

## Known failure modes

- No matching market found for the given topic keyword — returns empty or null result
- Polymarket API or data source is temporarily unavailable — may return timeout or 5xx error
- Ambiguous topic query matches multiple markets — may return aggregate or first-match result
- Stale data if Polymarket orderbook has low activity for that market
- Payment required error (HTTP 402) if USDC micropayment via x402 is not completed

## How this service works

Fetches live Polymarket prediction market orderbooks, implied Yes/No probabilities, volume, and whale sentiment for macro/crypto/AI events. (Live x402 v2, IETF MPP & MCP endpoint at https://preflight.agentdiet.dev/v1/polymarket-odds)

## Output

Returns live Polymarket orderbook data for the queried topic, including implied Yes and No probabilities (as percentages), 24h trading volume, whale sentiment signals, and other market metadata derived from active prediction market contracts on Polymarket.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "topic"
 ],
 "properties": {
  "topic": {
   "type": "string",
   "minLength": 1,
   "description": "Prediction market topic, event keyword, or question to query live Polymarket odds"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/preflight-agentdiet-dev-polymarket-live-prediction-market-odds-1f4a176d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from preflight.agentdiet.dev](https://www.zero.xyz/host/preflight.agentdiet.dev/llms.txt)