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Install in OpenClaw
/install simmer-market-maker
Description
Places GTC limit orders on both sides (bid/ask) of liquid Polymarket markets. Finds active markets with >$10k 24h volume, mid-range prices, and ample time to...
Usage Guidance
This skill is plausibly a market-maker and the code aligns with its stated purpose, but exercise caution before running it with a real API key: 1) The package metadata in the registry is inconsistent (missing required env, version mismatch) — ask the publisher or check an authoritative source. 2) Review the simmer-sdk package (source, publisher, permissions) before pip installing; consider installing into an isolated venv. 3) Test extensively in paper mode (TRADING_VENUE=sim or --dry-run) and don't run --live until satisfied. 4) Consider creating a scoped API key (if supported) with limited permissions and rotate it afterwards. 5) Inspect where the skill stores its config (simmer_sdk.skill.get_config_path) to ensure it doesn't expose secrets on disk. 6) If you lack confidence in the author, have a developer review the simmer-sdk and market_maker.py code paths that place/cancel orders (they use a private ._request method in places). These inconsistencies make the package suspicious but not demonstrably malicious; proceed only after the checks above.
Capability Analysis
Type: OpenClaw Skill
Name: simmer-market-maker
Version: 1.3.0
The skill is a legitimate market-making bot for Polymarket that uses the simmer-sdk to place and manage limit orders. It fetches market data from the Simmer API and live order book midpoints from the official Polymarket CLOB endpoint (clob.polymarket.com). The code in market_maker.py follows the strategy described in SKILL.md, includes appropriate safeguards against resolved markets or high slippage, and contains no evidence of data exfiltration, malicious execution, or prompt injection.
Capability Assessment
Purpose & Capability
The name/description, SKILL.md, clawhub.json, and market_maker.py all describe a market-maker using the Simmer SDK and Polymarket CLOB — requiring a SIMMER_API_KEY and the simmer-sdk Python package is proportionate. However, the registry summary at the top stated 'Required env vars: none' and the skill version in the registry (1.3.0) differs from SKILL.md and _meta.json (1.2.0). This packaging/metadata mismatch is an incoherence that could indicate sloppy publishing or an update that wasn't fully propagated.
Instruction Scope
SKILL.md and market_maker.py stick to market discovery, midpoint fetching, order placement/cancellation, and local config management. The code calls Polymarket CLOB midpoint endpoints and the Simmer API, cancels and places GTC orders, and can write/read local config via simmer_sdk.skill.load_config/update_config. It does not attempt to read arbitrary user files or transmit unrelated data. Note: it will cancel orders and place live trades when run with --live and a valid API key — this is expected but high-impact.
Install Mechanism
There is no installer script in the package (instruction-only install) but clawhub.json declares a pip dependency 'simmer-sdk'. Requiring a PyPI package is reasonable for this purpose, but pip-installed packages are an external trust decision — review simmer-sdk's provenance before installing. No arbitrary downloads or archive extraction are present in the skill files.
Credentials
The skill legitimately requires SIMMER_API_KEY (declared in SKILL.md and clawhub.json) and optionally TRADING_VENUE and a set of tuning env vars. However, the top-level registry summary incorrectly listed no required env vars, which is a packaging inconsistency. Requesting an API key is proportionate for a trading skill, but an API key is a sensitive credential — the skill will use it to place/cancel orders and view portfolio data.
Persistence & Privilege
The skill is not marked always:true and autostart is false. It is an automaton-managed entrypoint (managed: true) but that appears consistent with a runnable trading tool. It uses load_config/update_config which will write its own config files (normal for a tool), but it does not request system-wide or other-skills' configuration access.
How to Use
- Make sure OpenClaw is installed (local or Docker)
- Run the install command in chat:
/install simmer-market-maker - After installation, invoke the skill by name or use
/simmer-market-maker - Provide required inputs per the skill's parameter spec and get structured output
Version History
v1.3.0
Fix tick size: prices now rounded to 2 decimal places (Polymarket CLOB 0.01 minimum). Fix fee in edge calc: net profit now accounts for 2% fill fee on both sides. Fix min shares check logic.
v1.2.0
Fix registry assessment: add explicit SIMMER_API_KEY and TRADING_VENUE docs in SKILL.md; clawhub.json already had correct requires.env. Added Requirements table and pip install instructions.
v1.1.0
Fix: raise default max_order to $5 to avoid min-order skips on high-priced sides; add tunables for all config knobs
v1.0.0
- Initial release of Simmer Market Maker.
- Places GTC limit orders on both sides of liquid Polymarket markets to passively earn spread.
- Automatically selects markets with >$10k 24h volume, mid-range prices (0.15–0.85), ample time to resolve, and no taker fees.
- Quotes limit orders 2¢ below the CLOB midpoint on both YES and NO sides.
- Supports dry run, live trading, position overview, and configuration via command line and environment variables.
- Limits per order and per market are user-configurable.
Metadata
Frequently Asked Questions
What is Simmer Market Maker?
Places GTC limit orders on both sides (bid/ask) of liquid Polymarket markets. Finds active markets with >$10k 24h volume, mid-range prices, and ample time to... It is an AI Agent Skill for Claude Code / OpenClaw, with 156 downloads so far.
How do I install Simmer Market Maker?
Run "/install simmer-market-maker" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.
Is Simmer Market Maker free?
Yes, Simmer Market Maker is completely free, licensed under MIT-0. You can download, install and use it at no cost.
Which platforms does Simmer Market Maker support?
Simmer Market Maker is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).
Who created Simmer Market Maker?
It is built and maintained by PrYsM96 (@prysm96); the current version is v1.3.0.
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