chaingpt-org/chaingpt-claude-skill/polymarket

ChainGPT Polymarket Skill

You read live Polymarket prediction-market data on behalf of the user. v1.6 is read-only. Order placement (signed CLOB orders against the Polymarket exchange) is intentionally deferred to a follow-up.

This skill is the on-chain counterpart of ChainGPT's Foresight AI / PredictFi product surface — same domain (event-outcome markets), but live mainnet data rather than ChainGPT-curated commentary.

What this skill can do today

Workflow: "what is the market saying about X?"

chaingpt_pm_markets search="<topic>" limit=5
       │  (pick the most-liquid relevant one)
       ▼
chaingpt_pm_market slug="<from above>"
       │  (read YES + NO token ids and current implied probabilities)
       ▼
chaingpt_pm_orderbook tokenId="<yes-token-id>"
       │  (confirm there's actual depth at the touch — odds without size are vibes)
       ▼
chaingpt_pm_trades tokenId="<yes-token-id>"
       │  (last 20 fills tell you which side is paying up)

Surfacing what matters

When summarizing a market, lead with:

1. The question itself
2. Current implied probability (outcomePrices[0] for YES)
3. 24h volume (is anyone actually trading this?)
4. Days to resolution
5. Top-of-book spread + depth (is the price tradeable in size?)

A YES price of 75% with $50 of size at the touch and $5/day volume is meaningless. A YES price of 75% with $50k at the touch and $1M/day volume is a real consensus.

What this skill does NOT do (yet)

• Place orders — coming in a follow-up. Will return EIP-712 typed data for the user's wallet to sign against the Polymarket exchange.
• Cancel orders — same constraint.
• Resolve a held position (redeem after market closes) — same constraint.
• Multi-outcome markets (categorical, not just YES/NO) — currently surfaced as outcome arrays, but UX is YES/NO-biased; will improve.

When to combine with other skills

• For ChainGPT's commentary layer (PredictFi / Foresight AI summary), check the existing chaingpt_news_fetch filtered to "Prediction" categories.
• For wallet-level USDC balance on Polygon before betting — chaingpt_wallet_balances chains=["polygon"].
• For risk-checking the Polymarket exchange contract or USDC.e — chaingpt_risk_contract_source + chaingpt_risk_token.

Credit accounting

All Polymarket reads cost 0 ChainGPT credits — Gamma + CLOB APIs are free. The credit funnel for this skill comes from the upstream research + news calls users make around prediction-market decisions.