About

Imported from xu1713/openhorse (openhorse/openhorse/skills/research/polymarket/SKILL.md). Install upstream with npx skills add xu1713/openhorse --skill polymarket. Copyright stays with the author.

Polymarket — Prediction Market Data

Name: polymarket
Author: xu1713

Query prediction market data from Polymarket using their public REST APIs. All endpoints are read-only and require zero authentication.

See references/api-endpoints.md for the full endpoint reference with curl examples.

When to Use

User asks about prediction markets, betting odds, or event probabilities
User wants to know "what are the odds of X happening?"
User asks about Polymarket specifically
User wants market prices, orderbook data, or price history
User asks to monitor or track prediction market movements

Key Concepts

Events contain one or more Markets (1:many relationship)
Markets are binary outcomes with Yes/No prices between 0.00 and 1.00
Prices ARE probabilities: price 0.65 means the market thinks 65% likely
outcomePrices field: JSON-encoded array like ["0.80", "0.20"]
clobTokenIds field: JSON-encoded array of two token IDs [Yes, No] for price/book queries
conditionId field: hex string used for price history queries
Volume is in USDC (US dollars)

Three Public APIs

Gamma API at gamma-api.polymarket.com — Discovery, search, browsing
CLOB API at clob.polymarket.com — Real-time prices, orderbooks, history
Data API at data-api.polymarket.com — Trades, open interest

Typical Workflow

When a user asks about prediction market odds:

Search using the Gamma API public-search endpoint with their query
Parse the response — extract events and their nested markets
Present market question, current prices as percentages, and volume
Deep dive if asked — use clobTokenIds for orderbook, conditionId for history

Presenting Results

Format prices as percentages for readability:

outcomePrices ["0.652", "0.348"] becomes "Yes: 65.2%, No: 34.8%"
Always show the market question and probability
Include volume when available

Example: "Will X happen?" — 65.2% Yes ($1.2M volume)

Parsing Double-Encoded Fields

The Gamma API returns outcomePrices, outcomes, and clobTokenIds as JSON strings inside JSON responses (double-encoded). When processing with Python, parse them with json.loads(market['outcomePrices']) to get the actual array.

Rate Limits

Generous — unlikely to hit for normal usage:

Gamma: 4,000 requests per 10 seconds (general)
CLOB: 9,000 requests per 10 seconds (general)
Data: 1,000 requests per 10 seconds (general)

Limitations

This skill is read-only — it does not support placing trades
Trading requires wallet-based crypto authentication (EIP-712 signatures)
Some new markets may have empty price history
Geographic restrictions apply to trading but read-only data is globally accessible

Use it

Copy one of these into your project. Installing also returns the manifest and these snippets.

yaml

targets:
  - https://api.opensmartroute.ai/api/v1/registry/xu1713-openhorse-polymarket/manifest   # or paste the manifest below

Manifest

An Open Capability Manifest: the router reads it to know what this does, what it costs and when to pick it.

xu1713-openhorse-polymarket.ocm.jsonjson

{
  "ocm": "1",
  "id": "xu1713-openhorse-polymarket",
  "kind": "skill",
  "name": "polymarket",
  "description": "Query Polymarket: markets, prices, orderbooks, history.",
  "publisher": "xu1713",
  "version": "1.0.0",
  "capabilities": {
    "domains": [
      "data_analysis"
    ],
    "tags": [
      "skill-md",
      "polymarket",
      "prediction-markets",
      "market-data",
      "trading",
      "github"
    ],
    "languages": [
      "en"
    ]
  },
  "quality_prior": 0.6,
  "examples": [
    "Query Polymarket: markets, prices, orderbooks, history."
  ],
  "primary": false,
  "metadata": {
    "source": {
      "provider": "github",
      "repository": "https://github.com/xu1713/openhorse",
      "path": "openhorse/openhorse/skills/research/polymarket/SKILL.md",
      "ref": "7f33064660b18d6bc8295508bc704c94aa2350db",
      "url": "https://github.com/xu1713/openhorse/blob/7f33064660b18d6bc8295508bc704c94aa2350db/openhorse/openhorse/skills/research/polymarket/SKILL.md",
      "key": "xu1713/openhorse/openhorse/openhorse/skills/research/polymarket/SKILL.md"
    }
  },
  "instructions": "# Polymarket — Prediction Market Data\n\nQuery prediction market data from Polymarket using their public REST APIs.\nAll endpoints are read-only and require zero authentication.\n\nSee `references/api-endpoints.md` for the full endpoint reference with curl examples.\n\n## When to Use\n\n- User asks about prediction markets, betting odds, or event probabilities\n- User wants to know \"what are the odds of X happening?\"\n- User asks about Polymarket specifically\n- User wants market prices, orderbook data, or price history\n- User asks to monitor or track prediction market movements\n\n## Key Concepts\n\n- **Even",
  "cost": {
    "context_tokens": 681
  }
}

Fetch it by URL: GET /api/v1/registry/xu1713-openhorse-polymarket/manifest?version=1.0.0

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