0xNagato

Polymarket Complete Set Checker Lite — Development skill for Claude Code

Development community

Free, read-only Polymarket complete-set checker: fee calculator, YES+NO math, live top-of-book check.

How to install Polymarket Complete Set Checker Lite

This entry records only its repository, not the path inside it, so there is no exact command to give. Open 0xNagato/polymarket-complete-set-checker-lite and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What Polymarket Complete Set Checker Lite does

Free, read-only Polymarket complete-set checker: fee calculator, YES+NO math, live top-of-book check. Python stdlib only. No wallet, no API key, never trades. Agent skill (SKILL.md) for OpenClaw / Claude Code.

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README

Polymarket Complete-Set Checker (Lite)

Free, read-only. Answers one question: **does a YES+NO price gap on Polymarket survive the taker fee?**

fee: Polymarket's taker fee, shares × rate × p × (1 − p)
calc: YES+NO complete-set math on two prices you type in (buy-and-merge or split-and-sell)
check: live top-of-book check of the most active binary markets, using each market's own fee schedule

Python 3.9+, standard library only. No wallet, no API key, never places orders.

Quick start

python3 scripts/pm_lite.py calc --yes 0.48 --no 0.50 --size 100 --fee-rate 0.07
python3 scripts/pm_lite.py check --max-markets 100 --show-all --top 10
python3 -m unittest discover -s tests      # 8 offline tests

Worked example: YES 0.48 + NO 0.50 = 0.98, so it looks like 2¢ free per set. On 100 sets the fees are $2.00 at a 4% rate (net +$0.0016) and $3.50 at 7% (net **−$1.50**).

Honest expectations

Most checks find **nothing**. Real output from a live run (2026-10-27 00:22 UTC):

# 2026-10-27 00:22 UTC: 150 binary markets, fetching 300 books (top of book only)…
# 0 of 258 YES+NO checks show modelled profit after fees at the top of the book. Zero is the normal result. Research output only. Top-of-book prices m
strategy               title                                                    yes    no     sum    gap_before_fees  top_size  fee_rate  profit_after
---------------------  -------------------------------------------------------  -----  -----  -----  ---------------  --------  --------  ------------
buy YES+NO, merge      US x Yemen ceasefire continues through October 31?       0.987  0.014  1.001  -0.001           20        0         -0.02       
split $1, sell YES+NO  US x Yemen ceasefire continues through October 31?       0.986  0.013  0.999  -0.001           20        0         -0.02       
buy YES+NO, merge      Will Xavier Becerra win the California Governor Electi…  0.968  0.04   1.008  -0.008           5         0         -0.04