77 lines
3.0 KiB
Markdown
77 lines
3.0 KiB
Markdown
---
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name: polymarket
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description: Query Polymarket prediction market data — search markets, get prices, orderbooks, and price history. Read-only via public REST APIs, no API key needed.
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version: 1.0.0
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author: Hermes Agent + Teknium
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tags: [polymarket, prediction-markets, market-data, trading]
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---
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# Polymarket — Prediction Market Data
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Query prediction market data from Polymarket using their public REST APIs.
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All endpoints are read-only and require zero authentication.
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See `references/api-endpoints.md` for the full endpoint reference with curl examples.
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## When to Use
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- User asks about prediction markets, betting odds, or event probabilities
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- User wants to know "what are the odds of X happening?"
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- User asks about Polymarket specifically
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- User wants market prices, orderbook data, or price history
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- User asks to monitor or track prediction market movements
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## Key Concepts
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- **Events** contain one or more **Markets** (1:many relationship)
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- **Markets** are binary outcomes with Yes/No prices between 0.00 and 1.00
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- Prices ARE probabilities: price 0.65 means the market thinks 65% likely
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- `outcomePrices` field: JSON-encoded array like `["0.80", "0.20"]`
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- `clobTokenIds` field: JSON-encoded array of two token IDs [Yes, No] for price/book queries
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- `conditionId` field: hex string used for price history queries
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- Volume is in USDC (US dollars)
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## Three Public APIs
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1. **Gamma API** at `gamma-api.polymarket.com` — Discovery, search, browsing
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2. **CLOB API** at `clob.polymarket.com` — Real-time prices, orderbooks, history
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3. **Data API** at `data-api.polymarket.com` — Trades, open interest
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## Typical Workflow
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When a user asks about prediction market odds:
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1. **Search** using the Gamma API public-search endpoint with their query
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2. **Parse** the response — extract events and their nested markets
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3. **Present** market question, current prices as percentages, and volume
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4. **Deep dive** if asked — use clobTokenIds for orderbook, conditionId for history
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## Presenting Results
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Format prices as percentages for readability:
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- outcomePrices `["0.652", "0.348"]` becomes "Yes: 65.2%, No: 34.8%"
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- Always show the market question and probability
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- Include volume when available
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Example: `"Will X happen?" — 65.2% Yes ($1.2M volume)`
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## Parsing Double-Encoded Fields
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The Gamma API returns `outcomePrices`, `outcomes`, and `clobTokenIds` as JSON strings
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inside JSON responses (double-encoded). When processing with Python, parse them with
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`json.loads(market['outcomePrices'])` to get the actual array.
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## Rate Limits
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Generous — unlikely to hit for normal usage:
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- Gamma: 4,000 requests per 10 seconds (general)
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- CLOB: 9,000 requests per 10 seconds (general)
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- Data: 1,000 requests per 10 seconds (general)
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## Limitations
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- This skill is read-only — it does not support placing trades
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- Trading requires wallet-based crypto authentication (EIP-712 signatures)
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- Some new markets may have empty price history
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- Geographic restrictions apply to trading but read-only data is globally accessible
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