Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add ChainGPT-org/chaingpt-claude-skill --skill polymarketgit clone --depth 1 https://github.com/ChainGPT-org/chaingpt-claude-skillWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/chaingpt-org/chaingpt-claude-skill/polymarket)<a href="https://agentmods.dev/skills/chaingpt-org/chaingpt-claude-skill/polymarket"><img src="https://agentmods.dev/badge/skills/chaingpt-org/chaingpt-claude-skill/polymarket/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/chaingpt-org/chaingpt-claude-skill/polymarket"><img src="https://agentmods.dev/badge/skills/chaingpt-org/chaingpt-claude-skill/polymarket.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00101 | $0.00823 |
| Opus 5 | $0.00051 | $0.00411 |
| Sonnet 5 | $0.00020 | $0.00165 |
| Haiku 4.5 | $0.00010 | $0.00082 |
Grade A, and why
polymarket scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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
| Tool | Purpose |
|---|---|
chaingpt_pm_markets |
Discover markets sorted by 24h volume, with full-text search |
chaingpt_pm_market |
Detail on one market by slug or condition id — outcomes, prices, token ids, volume |
chaingpt_pm_orderbook |
L2 orderbook for one outcome token |
chaingpt_pm_trades |
Recent fills on one outcome token |
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:
- The question itself
- Current implied probability (
outcomePrices[0]for YES) - 24h volume (is anyone actually trading this?)
- Days to resolution
- 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.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 64 lines · 101 tokens per session scan A 824a129a2181
polymarket is a skill published in the GitHub repository ChainGPT-org/chaingpt-claude-skill (16 stars, last pushed 10d ago), licensed MIT. It adds 101 tokens to every session and 823 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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