Output:

Market question (truncated to 65 chars)
Primary outcome probability (Yes/No split)
24h volume
Days until market closes
Market slug (for detailed lookups)

Categories: Gamma API supports any tag in Polymarket's taxonomy. Common: politics, crypto, sports, elections, entertainment, economics.

odds [slug]

Get detailed odds for a specific market by slug or search term.

odds [slug]
odds [search term]

Examples:

odds will-trump-win-2024 — exact slug match
odds bitcoin — search for markets containing "bitcoin"
odds fed rate cut march — multi-term search

Output:

Full market question
Outcome probabilities with visual bar chart (█ filled, ░ empty)
24h trading volume
Market liquidity
Close date (absolute + days remaining)
Market description (truncated to 200 chars)
Live CLOB midpoint (if available)
Direct link to Polymarket web interface

Search behavior: If exact slug fails, performs client-side text search across market questions, slugs, and descriptions.

search [query]

Search across 100 active markets by text. Client-side filtering for instant results.

search [query]
search [term1] [term2] [term3]

Examples:

search bitcoin — single term
search bitcoin 100k — all terms must match
search fed interest rate — multi-word search
search election 2024 — phrase search

Output:

Up to 8 matching markets
Question, yes probability, volume, slug for each

Search logic: All query terms must appear in the market question, slug, or description (case-insensitive). Searches are cached for 2 minutes.

watchlist

Check odds on your configured watchlist markets.

watchlist

Output:

Current odds for each market on your watchlist
Volume, close date for each

Configuration: Add market slugs to ~/.openclaw/state/polymarket_watchlist.json:

{
  "slugs": [
    "will-trump-win-2024",
    "bitcoin-above-100k",
    "fed-rate-cut-march-2026"
  ]
}

Or via ~/.openclaw/config.yaml:

polymarket:
  watchlist:
    - will-trump-win-2024
    - bitcoin-above-100k
    - fed-rate-cut-march-2026

Data Source & Architecture

No API Key Required

Polymarket Command Center uses only public APIs:

Gamma API (https://gamma-api.polymarket.com) — Market metadata, outcomes, pricing
CLOB API (https://clob.polymarket.com) — Live bid/ask midpoints

Zero authentication. Zero credentials. Pure HTTP.

Thread-Safe Caching

In-memory cache with automatic eviction:

TTL: 120 seconds default (180s for trending, 120s for search)
Max entries: 100 (LRU eviction when full)
Thread-safe: Reentrant locks for concurrent requests
Smart invalidation: Expired entries auto-deleted on next access

CLOB Midpoints

The "Live midpoint" shown in odds details comes from CLOB (Central Limit Order Book) — Polymarket's on-chain order book. This represents the true real-time bid/ask spread. Falls back gracefully if CLOB data is unavailable.

Output Formats

Trending Markets

🔮 Polymarket Trending (crypto)

1. Will Bitcoin reach $100K by end of 2026?
   Yes: 72% | Vol: $2.5M | Closes: 45d
   📎 bitcoin-above-100k

2. Ethereum price above $5K on March 31 2026?
   Yes: 48% | Vol: $1.2M | Closes: 22d
   📎 ethereum-5k-march

💡 Say 'odds [slug]' for detailed odds on any market

Detailed Odds

🔮 Will Trump win the 2024 US Presidential Election?

Yes: 68% ████████████░░░░░░░░
No:  32% ██████░░░░░░░░░░░░░░

📊 Volume: $18.5M | Liquidity: $4.2M
📅 Closes: 2026-11-05 (240 days)

📝 Prediction market for the outcome of the 2024 U.S. Presidential election...

💹 Live midpoint: 67.8%

🔗 polymarket.com/event/will-trump-win-2024

Search Results

🔍 Polymarket search: 'bitcoin 100k'

1. Will Bitcoin reach $100K before end of 2026?
   Yes: 72% | Vol: $2.5M
   📎 bitcoin-above-100k

2. Bitcoin price prediction: $100K to $110K range by March 2026?
   Yes: 58% | Vol: $850K
   📎 bitcoin-100k-110k-range

💡 Say 'odds [slug]' for details on any market

Watchlist

👀 Polymarket Watchlist

🔮 Will Trump win the 2024 US Presidential Election?
   Yes: 68% | Vol: $18.5M

🔮 Will Bitcoin reach $100K by end of 2026?
   Yes: 72% | Vol: $2.5M

🔮 Will Fed cut rates in March 2026?
   Yes: 64% | Vol: $3.1M

Response Codes

Status	Meaning	Action
❌	Network error	Retry in a minute; check internet connection
🔮	Success	Market data loaded and formatted
👀	Watchlist	Your configured markets
🔍	Search	Client-side filtered results
💡	Tip	Suggested next action

Cache Behavior

First call: Hits Polymarket API, caches result
Repeated calls (within TTL): Returns cached data instantly
Stale data (past TTL): Cache evicted, fresh API call triggered
Bounded memory: Max 100 entries; oldest evicted when full
Thread-safe: Safe for concurrent requests (e.g., morning brief + user query)

Example timeline:

14:30:00 - User: "trending"
           → API call → cache set (expires 14:32:00)
           → response with 10 markets

14:30:45 - User: "trending"
           → cache hit (28s old)
           → instant response (same data)

14:32:15 - User: "trending"
           → cache miss (expired 15s ago)
           → API call → cache set (expires 14:34:15)
           → response with fresh data

Configuration (Optional)

All commands work without any configuration. Optional settings in ~/.openclaw/config.yaml:

polymarket:
  enabled: true
  watchlist:
    - will-trump-win-2024
    - bitcoin-above-100k
    - fed-rate-cut-march-2026
  categories:
    - politics
    - crypto
    - sports

No config needed — defaults work for all commands.

Supported Market Categories

Gamma API returns markets tagged with these common categories:

politics — Elections, political outcomes
crypto — Bitcoin, Ethereum, altcoins, blockchain
sports — NFL, NBA, Premier League, Olympic Games
entertainment — Movies, award shows, celebrity news
economics — Fed rates, inflation, jobs data
weather — Extreme weather events
science — Space, breakthrough discoveries
business — Tech IPOs, M&A, earnings

Custom tags may appear; Gamma API returns whatever is configured.

Implementation Details

HTTP Client

User-Agent: OpenClaw-Polymarket/1.0
Timeout: 10 seconds per request
Accept: application/json
No cookies; stateless requests

Error Handling

Network timeouts → graceful "couldn't reach Polymarket"
Malformed JSON → ignored, fallback to empty results
Unicode decode errors → handled silently

Outcome Parsing

Polymarket API returns outcomes and prices as JSON-stringified arrays. Command Center auto-detects format (string vs. array) and parses both.

Binary markets: ["Yes", "No"] outcomes with [yes_price, no_price]

Categorical markets: ["Trump", "Harris", "RFK Jr"] with corresponding prices.

OpenClaw Ecosystem Integration

Read-only Polymarket data layer for the Prediction Market Trading Stack.

Connected Skill	How It Connects
Market Morning Brief	Polymarket trending data appears in your daily brief
Prediction Market Arbiter	Polymarket prices compared against Kalshi for divergences
Xpulse	Social signals correlated with Polymarket movements

Install the complete stack:

clawhub install kalshalyst kalshi-command-center polymarket-command-center prediction-market-arbiter xpulse portfolio-drift-monitor market-morning-brief personality-engine

Example Workflows

Monitor Crypto Market Sentiment

1. trending crypto        # See top crypto markets by volume
2. odds bitcoin-above-100k  # Detailed probability for BTC
3. search ethereum        # Find Ethereum-related markets
4. watchlist             # Check your configured positions

Track Election Predictions

1. trending politics     # Top political markets
2. odds will-trump-win-2024  # Detailed odds + CLOB midpoint
3. search harris         # Look for related markets
4. Add to watchlist      # Monitor probability shifts

Find Hidden Opportunities

1. trending               # All markets
2. search [niche term]   # Find underexplored markets
3. odds [slug]           # Check volumes and liquidity
4. Compare CLOB midpoint vs. displayed probability

Limitations & Notes

Read-only: No trading, no account creation
Public data only: No private market insights
Gamma API limits: ~100 markets per request (used in search)
CLOB midpoints: May be unavailable for some markets (graceful fallback)
Pricing: Outcomes always shown as decimal probabilities (0.68 = 68%)
Closed markets: Excluded from trending/search; archived on Polymarket

Troubleshooting

Issue	Solution
"Couldn't reach Polymarket"	Retry in 1 minute; check internet
"No markets found for..."	Try broader search term; check spelling
"No watchlist configured"	Add watchlist to config.yaml or create ~/.openclaw/state/polymarket_watchlist.json
Cached data looks stale	Cache TTL is 2 minutes; wait or restart service
CLOB midpoint missing	Market may not have CLOB tokens yet (new markets)

Version History

v1.0.0 (2026-03-09)

Initial release
Commands: trending, odds, search, watchlist
Thread-safe caching with 120s TTL
CLOB midpoint integration
Zero API key required
100% read-only (no trading)

Feedback & Issues

Found a bug? Have a feature request? Want to share results?

GitHub Issues: github.com/kingmadellc/openclaw-prediction-stack/issues
X/Twitter: @KingMadeLLC

Part of the OpenClaw Prediction Stack — the first prediction market skill suite on ClawHub.

Polymarket Command Center

Polymarket Command Center

Commands

trending