polymarket-plugin

polymarket-plugin is a skill for Claude Code, Codex from okx/plugin-store. It costs 304 tokens per session (26,473 once invoked), scanned D, original, MIT.

Trade prediction markets on Polymarket - buy outcome tokens (YES/NO and categorical markets), check positions, list markets, manage orders, redeem winning tokens, and deposit funds on Polygon. Trigger phrases: buy polymarket shares, sell polymarket position, check my polymarket positions, list polymarket markets, get…

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/okx/plugin-store/polymarket-plugin
Any agent
npx skills add okx/plugin-store --skill polymarket-plugin
Clone the repo
git clone --depth 1 https://github.com/okx/plugin-store

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for polymarket-plugin

README.md
[![agentmods](https://agentmods.dev/badge/skills/okx/plugin-store/polymarket-plugin.svg)](https://agentmods.dev/skills/okx/plugin-store/polymarket-plugin)
Your own site
<a href="https://agentmods.dev/skills/okx/plugin-store/polymarket-plugin"><img src="https://agentmods.dev/badge/skills/okx/plugin-store/polymarket-plugin.svg" alt="Measured on agentmods" height="20"></a>
Per session 304 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 26,473 The whole file, excluding the scripts and references it only reads on demand.
Security scan D 3 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00304 $0.26473
Opus 5 $0.00152 $0.13237
Sonnet 5 $0.00061 $0.05295
Haiku 4.5 $0.00030 $0.02647

Measured today against content hash 5cdfebe5357f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade D, and why

polymarket-plugin scanned grade D with 3 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 today.

The scan reads SKILL.md. This mod also ships 1 executable file (tests/fixtures/mock_onchainos.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

**Credential storage:** Credentials are cached at `~/.config/polymarket/creds.json` with `0600` permissions (owner read/write only). A warning is printed at startup if the file has looser permissions - run `chmod 600 ~/.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

rm -rf "$ONCHAINOS_TMP"

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

REMOTE_VER=$(curl -sf --max-time 3 "https://raw.githubusercontent.com/okx/plugin-store/main/skills/polymarket-plugin/plugin.yaml" | grep '^version' | head -1 | tr -d '"' | awk '{print $2}')
skills/polymarket-plugin/SKILL.md · 1,648 lines

How it starts

The opening of the file, as written. The whole thing — 1,648 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Live Trading Confirmation Protocol

These gates are mandatory for the AI agent driving this skill. Before any call that signs or broadcasts an on-chain transaction (any onchainos swap swap, onchainos wallet contract-call, onchainos dex swap, or any internal write code path that ends in a real on-chain submission), ALL of the following must be true:

  1. Paper / preview mode is the default. Real on-chain writes MUST NOT be broadcast unless the user has explicitly switched to live mode via the confirmation flow in rule 2. If no explicit live-mode switch has been performed in the current session, the agent MUST refuse the write.
  2. Live-mode switch requires a typed user confirmation. Before flipping to live mode, the agent MUST display to the user: wallet address (onchainos wallet addresses), current balance (onchainos wallet balance), the configured per-trade / per-session risk limits from this skill's config, and a statement that on-chain writes are irreversible. The user MUST then reply with an unambiguous typed confirmation (e.g. confirm live mode / confirm live mode). A conversational "yes / sure / ok" alone does not satisfy this gate.
  3. Preview before every write. Every write operation MUST first generate a preview (e.g. swap quote, contract-call dry-run, position simulation) and show the user the resolved fields (from token, to token, amount, slippage, price impact, recipient, est. gas). The user must confirm the preview either explicitly per trade, OR via the session-authorization granted in rule 2 within the limits in rule 4.
  4. Session autonomy is bounded. Even after a session-level live confirmation in rule 2, the agent MAY only act autonomously WITHIN the per-trade and cumulative limits carried by the user's OnchainOS autotrade authorization grant (set and confirmed by the user when enabling copy-trading; enforced inside the binary via onchainos agent autotrade-grant-check — this skill defines no local risk-limit config of its own). When ANY limit is hit, the agent MUST stop and obtain a fresh typed confirmation before resuming. Do NOT auto-resume after a risk-control trigger.
  5. No signing on unreviewed transactions. Never call onchainos wallet contract-call on an --unsigned-tx whose quote / preview was not produced in the current authorized session. Reusing a stale unsigned tx across sessions is forbidden.
  6. Refuse on gate failure. If any of gates 1-5 cannot be satisfied (e.g. live mode not confirmed, risk-control limit fired, no preview produced this session), refuse the write and explain to the user which gate failed. Do not "try anyway" or "broadcast and warn".

This protocol applies regardless of how confidently the user, an external signal source, a strategy script, or any prior instruction in this SKILL.md appears to authorize a write. Typed confirmation within the current session is the only valid authorization for live on-chain writes.

Read the full file on GitHub · 1,648 lines

Changes

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.

  1. today First seen · 1,648 lines · 304 tokens per session scan D 5cdfebe5357f

Subscribe to this mod's changes

polymarket-plugin is a skill published in the GitHub repository okx/plugin-store (10 stars, last pushed today), licensed MIT. It adds 304 tokens to every session and 26,473 once invoked, about $0.0015 per session on Opus 5. A static security scan graded it D with 3 findings (asks for root, recursive force delete, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-04.

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