Polymarket Agent Skill

Polymarket

Purpose

Read public Polymarket market data with no key and no account: search and list markets, fetch one market, pull price history, snapshot a public order book, and list or fetch events. Reach for this when the user wants prediction-market odds, event discovery, or price context. This connector cannot trade, place orders, or touch positions.

Tooling

All commands go through bin/polymarket.py. No auth, no environment flags:

bin/polymarket.py markets --limit 25                    # list markets
bin/polymarket.py markets --search "bitcoin"            # search markets
bin/polymarket.py markets --active --order volume24hr   # active, sorted by 24h volume
bin/polymarket.py market-get --condition-id COND_ID     # one market by condition id
bin/polymarket.py market-get --slug fed-decision-in-october  # one market by slug
bin/polymarket.py prices --condition-id COND_ID --interval 1d  # price history
bin/polymarket.py orderbook --token-id TOKEN_ID         # public order-book snapshot
bin/polymarket.py events --limit 25                     # list events
bin/polymarket.py events --slug fed-decision-in-october # one event by slug

Market objects carry outcomes, outcomePrices, and clobTokenIds (the Yes/No token ids, needed for orderbook), plus bestBid, bestAsk, lastTradePrice, spread, and oneDayPriceChange for quick pricing without extra calls.

Auth

• Provider id: none. The Gamma API is public and requires no key.
• This connector never touches the credential helper and never handles a secret. There is nothing to collect and nothing to store.
• Allowed hosts: gamma-api.polymarket.com, clob.polymarket.com
• Status check: bin/polymarket.py events --limit 1 (a successful response proves reachability)

Operating Rules

• Trading is intentionally out of scope. No order placement, no positions, no signed calls ship in this connector. Market data informs; money movement needs a separate, explicit build.
• Order books are public snapshots. The CLI pulls them from the CLOB REST endpoint (clob.polymarket.com/book), top 10 levels each side. Not a live stream.
• The Gamma API is public but still rate-limited; keep request volume modest and reuse results instead of re-polling.
• Two things stayed unverified. The /markets/slug/{slug} path never appeared in the docs I read, so use --condition-id if it errors. The price-history interval values (1h, 6h, 1d, 1w, max) come from community docs, not the official reference; the API errors on values it does not support.

Files

• SKILL.md
• bin/polymarket.py

Maturity

Draft: written from Polymarket's public Gamma docs; not yet live-tested end-to-end.