Free Polymarket API — Live Odds, Order Books & Trading Signals

Real-time prediction market data. No API key, no signup, no rate limits for free tier.

Updated August 2, 2026 · Mythos Agent Toolkit

Quick Start

The free Polymarket API is available at /poly/odds — returns extreme-odds markets in JSON format. No authentication required.

curl http://99.81.245.60/poly/odds

Returns a JSON array of markets where "Yes" or "No" price deviates significantly from midpoint, sorted by probability distance:

[
  {
    "question": "Will Bitcoin reach $100k in 2026?",
    "slug": "bitcoin-100k-2026",
    "yesPrice": 0.12,
    "noPrice": 0.88,
    "volume24h": 1250000,
    "liquidity": 450000,
    "closingAt": "2026-12-31T23:59:59Z",
    "url": "https://polymarket.com/event/bitcoin-100k-2026"
  }
]

Free API Endpoints

GET/poly/odds — Extreme odds markets (top 25, by probability distance)

GET/poly/odds?sort=volume — Top markets by 24h volume

GET/poly/odds?sort=closing — Markets closing soonest

GET/badge/<slug>.svg — Embeddable SVG odds badge for any market

Embeddable SVG Badges

Add live Polymarket odds to your website, README, or blog with zero JavaScript:

<img src="http://99.81.245.60/badge/bitcoin-100k-2026.svg"
     alt="Bitcoin $100k odds" />

Badges auto-update every 30 seconds. Perfect for forums, documentation, and dashboards.

Free Web Dashboards

Tool	What It Shows
Polymarket Smart Scanner	Live odds, volume, liquidity, expiry. Sort by extreme odds, volume, closing soon.	Open →
Polymarket Dashboard	Extreme odds, volume leaders, near-expiry markets. Auto-refreshing.	Open →
Badge Generator	Generate embeddable SVG badges for any Polymarket event.	Open →

Paid API — For AI Agents & Production Use

Agents & production apps use our paid x402 APIs:
/polymarket — Full market data, 500+ events ($0.005/call)
/poly-ob — CLOB V2 order book with bid/ask depth ($0.003/call)
/poly-signals — Trading signals from order book ($0.003/call)
/poly-depth — Order book depth by price level ($0.002/call)
/poly-walls — Buy/sell wall detection ($0.002/call)

Pay with USDC or ETH on Base. Get API credits →

Why Use This Instead of Polymarket's Own API?

No API key required for free endpoints — Polymarket's CLOB API needs authentication
Simplified JSON — Pre-processed, clean format. No token ID decoding needed
Embeddable badges — Drop live odds into any HTML page with <img> tag
Pre-computed signals — Trading signals from order book analysis, ready to use
x402 payments — AI agents pay per call with USDC. No subscription, no API key management

Rate Limits

Free endpoints: 15 calls/day per IP. Paid endpoints: unlimited with credits or per-call x402 payment.

Example: Build a Trading Bot

# 1. Find extreme-odds markets (free)
curl http://99.81.245.60/poly/odds?sort=volume > opportunities.json

# 2. Get order book depth for top opportunity (paid, $0.002)
curl -H "X-API-Key: mythos-YOUR_KEY" \
  "http://99.81.245.60/poly-depth?slug=bitcoin-100k-2026"

# 3. Check for buy/sell walls (paid, $0.002)
curl -H "X-API-Key: mythos-YOUR_KEY" \
  "http://99.81.245.60/poly-walls?slug=bitcoin-100k-2026"

All Mythos APIs

Beyond Polymarket: 30+ APIs for AI agents — crypto prices, gas tracking, wallet scanning, CAPTCHA solving, DNS lookup, web scraping, browser rendering, and more.

View full API catalog → · Try live in API Playground →