polymarket-market-maker SKILL.md skillA
polymarket-market-maker from spartanlabsxyz/simmer-sdk is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add spartanlabsxyz/simmer-sdk/polymarket-market-maker@v0.9.3Pins v0.9.3 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- spartanlabsxyz/simmer-sdk
- Path
skills/polymarket-market-maker/SKILL.md- Versions recorded
- 4
- Latest version
- v0.9.3, committed Oct 20, 2026
- First version recorded
- May 19, 2026
- Size
- 7,503 bytes
- Repository stars
- 56
- License
- MIT
Post two-sided GTC limit orders on Polymarket CLOB. Manages inventory skew, cancel/replace on price drift, and estimates rebate-eligible volume.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Polymarket Market Maker
Post two-sided GTC limit orders (bid + ask) on Polymarket CLOB to earn the bid-ask spread as a liquidity provider. This is a **developer-only SDK primitive** — not a retail "set and forget" skill. You will need to monitor inventory and tune spread/skew parameters to your specific markets.
> **Why this matters.** Akey, Grégoire, Harvie & Martineau (2026) studied 1.4M Polymarket users and $20B in volume. Their headline finding: moving from pure taker to pure market-maker reduces the probability of losing money by **35.9 percentage points** — more than 10× larger than any other behavioral predictor (overtrading: 5pp, category concentration: 13.6pp, extreme-price trading: 3pp). This is the single highest-edge behavior on Polymarket.
## How it works
```
Each run (cron or manual):
For each configured market:
1. Fetch current mid price (external_price_yes)
2. Compute bid/ask:
bid = mid - spread/2 (round to 0.01 tick)
ask = mid + spread/2 (round to 0.01 tick)
3. Check inventory: if net_YES_skew > max_skew → pause bidding
if net_NO_skew > max_skew → pause asking
…Read the whole file at its exact version.
How to install
mdr add spartanlabsxyz/simmer-sdk/polymarket-market-maker@sha256:aa0681b1a7982de7The line at the top of this page pins the label v0.9.3, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_nhdhxrqfzv6iq3a3)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 4 versions of this file, between May 19, 2026 and Oct 20, 2026, about one every 51 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v0.9.3 latest | 2026-10-20 | ae8f0e8 | 7,503 B | A | view · diff |
| v0.9.2 | 2026-10-19 | 667a734 | 7,365 B | A | view · diff |
| v0.9.1 | 2026-10-16 | 25c80f4 | 7,354 B | A | view · diff |
| v0.9.0 | 2026-05-19 | 15e5f03 | 7,381 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7503 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
spartanlabsxyz/simmer-sdk · 56 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_nhdhxrqfzv6iq3a3 GET https://markdownregistry.com/api/v1/resolve?ref=spartanlabsxyz/simmer-sdk/polymarket-market-maker GET https://markdownregistry.com/api/v1/blob/aa0681b1a7982de7374fef230b58283742be10023d2ba3d04e239716a16a21ec
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.