What is polymarket-paper-trader CLAUDE.md?

Repository instructions for a Python paper-trading simulator for Polymarket, a prediction-market platform.

Use it to install the project, run the command-line tool or its MCP server, simulate trades, and run its test suites.

It gives the installation, commands, project structure, and tests needed to work on the simulator safely.

How agent-next/polymarket-paper-trader configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to agent-next/polymarket-paper-trader. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/agent-next/polymarket-paper-trader/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/agent-next/polymarket-paper-trader

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/agent-next/polymarket-paper-trader/claude-md.svg)](https://agentmods.dev/instructions/agent-next/polymarket-paper-trader/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/agent-next/polymarket-paper-trader/claude-md"><img src="https://agentmods.dev/badge/instructions/agent-next/polymarket-paper-trader/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 1,257 This file is loaded in full into every session.

When invoked 1,257 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original 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.

Model	Per session	Once invoked
Fable 5.1	$0.01257	$0.01257
Opus 5	$0.00629	$0.00629
Sonnet 5	$0.00251	$0.00251
Haiku 4.5	$0.00126	$0.00126

Measured 8d ago against content hash a8a766627b5c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

polymarket-paper-trader CLAUDE.md 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 8d 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.

CLAUDE.md · 98 lines

How it starts

The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

polymarket-paper-trader

Paper trading simulator for Polymarket. Built for AI agents. Python 3.10+, SQLite, Click CLI, FastMCP.

Commands

# Install
pip install -e ".[dev]"

# Tests (620 non-live + 42 live = 662 total, 100% coverage)
python3 -m pytest tests/ -x -q -m "not live"            # fast, skip live API tests
python3 -m pytest tests/ -v                              # verbose
python3 -m pytest tests/ --cov=pm_trader --cov-report=term-missing  # coverage
python3 -m pytest tests/test_e2e_live.py -v              # live API (requires network)

# Single test file / single test
python3 -m pytest tests/test_engine.py -x -q             # one file
python3 -m pytest tests/test_engine.py::TestBuy::test_buy_yes -x -q  # one test

# Run
pm-trader init --balance 10000
pm-trader-mcp                                            # MCP server on stdio

Architecture

cli.py → engine.py → api.py (Polymarket HTTP)
                   → db.py (SQLite, WAL mode)
                   → orderbook.py (fill simulation)
                   → orders.py (limit order state machine)

mcp_server.py → engine.py (trading tools, 30 MCP tools)
              → analytics.py, card.py, benchmark.py, backtest.py (lazy imports)

Engine is the orchestrator. All trading logic goes through it.
mcp_server.py uses engine for trading, but imports analytics/card/benchmark/backtest directly (lazy, inside tool functions, to keep startup fast).
orderbook.py has pure functions (simulate_buy_fill, simulate_sell_fill) — no side effects.
orders.py has pure SQLite functions for limit order CRUD — no Engine dependency.
api.py talks to Gamma API (market discovery) and CLOB API (prices, order books).
db.py owns the SQLite schema. WAL mode for concurrent reads.

Conventions

Code style

from __future__ import annotations at top of every module
Complete type hints on all functions: def foo(x: int) -> str:
Union types use | syntax: str | None, not Optional[str]
Private functions prefixed with _: _parse_market(), _get_cached()
Outcomes always lowercase: "yes", "no" (normalized via _validate_outcome)

Read the full file on GitHub · 98 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.

8d ago First seen · 98 lines · 1,257 tokens per session scan A a8a766627b5c

Subscribe to this mod's changes

polymarket-paper-trader CLAUDE.md is an instructions file published in the GitHub repository agent-next/polymarket-paper-trader (389 stars, last pushed 23d ago), licensed MIT. It adds 1,257 tokens to every session, about $0.0063 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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AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.

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vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

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polymarket-paper-trader: Instructions file for Claude Code