agenttrader 0.2.3

Prediction market strategy research, backtesting, and paper trading toolkit

agenttrader

agenttrader is a toolkit that lets AI agents autonomously research, write, backtest, and deploy prediction market trading strategies — without human intervention.

Give an agent a goal. It handles everything: discovering markets on Polymarket and Kalshi, analyzing price history, writing strategy code, running the backtesting loop, and starting a live paper trading daemon. Running strategies hot-reload automatically when the strategy file changes — agents can iterate on live deployments without restarting.

All market data flows through pmxt, unified across Polymarket and Kalshi.

Primary users: AI coding agents (Claude Code, Codex, OpenCode, Cursor).
Secondary users: Developers who want to write and test strategies manually.

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How It Works

Agent receives goal
       │
       ▼
agenttrader sync          ← pull market data into local cache
       │
       ▼
agenttrader markets list  ← discover opportunities
       │
       ▼
[agent writes strategy.py]
       │
       ▼
agenttrader validate      ← catch errors before they waste time
       │
       ▼
agenttrader backtest      ← test against real historical data
       │
       ├─── metrics look bad? agent edits strategy.py, loops back
       │
       ▼
agenttrader paper start   ← deploy as background daemon
       │
       ▼
[agent edits strategy.py] ← daemon hot-reloads, no restart needed

All state lives locally in ~/.agenttrader/. No cloud backend. No app account required. PMXT market data does not require an API key.

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Quickstart

Prerequisites

python --version    # 3.12+ required
pip --version

Install PMXT dependencies (Python package + Node.js sidecar):

pip install pmxt
npm install -g pmxtjs

Install

pip install agenttrader
agenttrader init

Verify it works

agenttrader sync --platform polymarket --days 2 --limit 5 --json
agenttrader markets list --json

If you see markets in the output, you're ready.

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Using agenttrader With Your Agent

There are two ways to connect your agent to agenttrader. MCP is recommended — it's the most natural interface for agents. CLI mode works as a fallback if MCP isn't available.

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Option A: MCP (Recommended)

MCP lets your agent call agenttrader tools as native function calls — no shell commands, no output parsing. The agent calls get_markets(), run_backtest(), start_paper_trade() directly inside its reasoning loop.

Setup for Claude Code

Add this to .claude/mcp.json in your project directory:

{
  "mcpServers": {
    "agenttrader": {
      "command": "agenttrader",
      "args": ["mcp"]
    }
  }
}

Restart Claude Code. The MCP server starts automatically — you never run agenttrader mcp manually.

Setup for Cursor

In Cursor settings → MCP → add server:

{
  "name": "agenttrader",
  "command": "agenttrader",
  "args": ["mcp"],
  "transport": "stdio"
}

Setup for any other MCP-compatible agent

{
  "mcpServers": {
    "agenttrader": {
      "command": "agenttrader",
      "args": ["mcp"]
    }
  }
}

The transport is stdio. The agent spawns agenttrader mcp as a subprocess and communicates over stdin/stdout. No port, no server to keep running.

Available MCP tools

Category	Tools
Markets	get_markets, get_price, get_history, match_markets
Strategy	validate_strategy, run_backtest, get_backtest, list_backtests
Paper trading	start_paper_trade, get_portfolio, stop_paper_trade, list_paper_trades
Data	sync_data

Example agent prompts (MCP mode)

Once connected, give your agent natural language goals:

Use agenttrader to find the 10 most liquid Polymarket politics markets.
Build a mean reversion strategy in ./strategy.py. Backtest it from
2024-06-01 to 2024-12-31 with $10,000 starting cash. Iterate until
Sharpe ratio > 1.0 and max drawdown better than -20%. Then start
paper trading and report the portfolio_id.

Check my current paper trading portfolio. If any position has been
open for more than 7 days with negative PnL, update the strategy
to add a stop-loss and let me know what changed.

Find prediction markets on both Polymarket and Kalshi covering the
same event. Write an arbitrage strategy that trades the price
discrepancy when it exceeds 3 cents. Backtest it and paper trade it.

The agent will chain tool calls autonomously — syncing data, writing and editing strategy.py, running backtests, reading metrics, iterating, and deploying — without you touching a terminal.

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Option B: CLI Mode

If your agent can run shell commands (most can), it can use agenttrader without any MCP setup. Every command supports --json for clean, parseable output.

Setup

No configuration needed beyond the initial install. Your agent runs commands like:

agenttrader sync --platform polymarket --days 7 --limit 20 --json
agenttrader markets list --platform polymarket --json
agenttrader validate ./strategy.py --json
agenttrader backtest ./strategy.py --from 2024-01-01 --to 2024-06-01 --json
agenttrader paper start ./strategy.py --cash 5000 --json
agenttrader paper status <portfolio_id> --json

Example agent prompts (CLI mode)

For Claude Code without MCP configured:

Use the agenttrader CLI to research Polymarket crypto markets.
Run: agenttrader markets list --platform polymarket --category crypto --json
Then build a strategy in ./strategy.py and iterate using:
  agenttrader validate ./strategy.py --json
  agenttrader backtest ./strategy.py --from 2024-01-01 --to 2024-06-01 --json
Keep iterating until Sharpe > 1.0, then run:
  agenttrader paper start ./strategy.py --json
Report the portfolio_id when done.

The JSON contract

Every --json response follows this shape:

{ "ok": true, "...": "..." }

{ "ok": false, "error": "ErrorType", "message": "Human-readable details" }

Strategy errors include line numbers and tracebacks so agents can self-heal:

{
  "ok": false,
  "error": "StrategyError",
  "message": "name 'undefined_var' is not defined",
  "file": "./strategy.py",
  "line": 14,
  "traceback": "Traceback (most recent call last):\n  ..."
}

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The Agent Iteration Loop

Whether using MCP or CLI, the core loop looks like this:

1. sync market data
2. inspect markets + history
3. write strategy.py
4. validate --json          → fix any errors
5. backtest --json          → read Sharpe, drawdown, win rate
6. edit strategy.py         → improve based on metrics
7. repeat 4–6 until satisfied
8. paper start              → deploy daemon
9. paper status --json      → monitor
10. edit strategy.py live   → daemon hot-reloads automatically

Steps 3–7 are where agents spend most of their time. A well-prompted agent will iterate 5–10 times before deploying, each time reading the structured backtest metrics and making targeted improvements to the strategy logic.

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Strategy Authoring

Strategies are plain Python files that subclass BaseStrategy. Write them in any editor — or let your agent write them.

from agenttrader import BaseStrategy

class MyStrategy(BaseStrategy):

    def on_start(self):
        # Subscribe to markets — called once at startup
        self.subscribe(platform="polymarket", category="politics")

    def on_market_data(self, market, price, orderbook):
        # Called on every price update for subscribed markets
        history = self.get_history(market.id, lookback_hours=48)
        if len(history) < 2:
            return

        avg = sum(h.yes_price for h in history) / len(history)

        if price < avg - 0.08 and self.get_position(market.id) is None:
            self.buy(market.id, contracts=20)
            self.log(f"BUY {market.title[:40]} @ {price:.3f}")

        elif price > avg + 0.05 and self.get_position(market.id):
            self.sell(market.id)
            self.log(f"SELL {market.title[:40]} @ {price:.3f}")

    def on_schedule(self, now, market):
        # Called every 15 minutes — use for time-based logic
        hours_left = (market.close_time - now.timestamp()) / 3600
        if hours_left < 3 and self.get_position(market.id):
            self.sell(market.id)
            self.log(f"Pre-expiry close: {hours_left:.1f}h left")

    def on_resolution(self, market, outcome, pnl):
        # Called when a market resolves
        self.log(f"Resolved: {outcome}, PnL: ${pnl:.2f}")

Available methods inside a strategy:

# Subscribe + discover
self.subscribe(platform, category, tags, market_ids)
self.search_markets(query, platform)

# Price + data (time-bounded in backtesting — no look-ahead bias)
self.get_price(market_id)               # current YES price (0.0–1.0)
self.get_orderbook(market_id)           # bids, asks, best_bid, best_ask, mid
self.get_history(market_id, lookback_hours)  # list of PricePoint objects

# Portfolio
self.get_position(market_id)            # open Position or None
self.get_cash()                         # available cash
self.get_portfolio_value()              # cash + mark-to-market positions

# Orders
self.buy(market_id, contracts, side="yes", order_type="market")
self.sell(market_id, contracts=None)    # None = sell entire position

# Utilities
self.log(message)                       # appears in dashboard + paper status
self.set_state(key, value)              # persist state across calls
self.get_state(key, default)

Do not call PMXT directly from a strategy. Do not import requests, httpx, pmxt, or any networking library. All data access goes through self.* methods.

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All Commands

Setup

agenttrader init
agenttrader config show

Data Sync

agenttrader sync                                          # top 100 markets, 90 days
agenttrader sync --platform polymarket --days 7
agenttrader sync --platform kalshi --days 7
agenttrader sync --resolved --days 365 --platform polymarket --json   # resolved/expired markets
agenttrader sync --markets <id1> --markets <id2>          # specific markets
agenttrader sync --json

Markets

agenttrader markets list
agenttrader markets list --platform polymarket --limit 20 --json
agenttrader markets list --category politics --min-volume 50000
agenttrader markets price <market_id> --json
agenttrader markets history <market_id> --days 30 --json
agenttrader markets screen --condition "current_price < 0.30" --json
agenttrader markets screen --condition "price_vs_7d_avg < -0.10" --platform polymarket --limit 20 --json
agenttrader markets match --polymarket-slug "<slug>"
agenttrader markets match --kalshi-ticker "<ticker>"

markets screen runs only on local cache data (SQLite) and supports fixed metric expressions:

price_vs_7d_avg, current_price, volume, days_until_close, price_change_24h with operators <, >, <=, >=, ==.

Validate

agenttrader validate ./strategy.py
agenttrader validate ./strategy.py --json

Backtest

agenttrader backtest ./strategy.py --from 2024-01-01 --to 2024-06-01
agenttrader backtest ./strategy.py --from 2024-01-01 --to 2024-06-01 --cash 10000
agenttrader backtest ./strategy.py --from 2024-01-01 --to 2024-06-01 --json
agenttrader backtest list --json
agenttrader backtest show <run_id> --json

Backtest results include:

{
  "metrics": {
    "total_return_pct": 32.4,
    "sharpe_ratio": 1.84,
    "sortino_ratio": 2.31,
    "max_drawdown_pct": -12.3,
    "win_rate": 0.61,
    "profit_factor": 2.14,
    "calmar_ratio": 2.63,
    "avg_slippage": 0.008,
    "total_trades": 47
  },
  "resolution_accuracy": {
    "bought_yes_resolved_yes_pct": 0.64,
    "bought_no_resolved_no_pct": 0.58,
    "sample_size": 47
  },
  "by_category": {
    "politics": { "trades": 23, "win_rate": 0.65, "return_pct": 18.2 },
    "sports": { "trades": 14, "win_rate": 0.43, "return_pct": -4.1 }
  },
  "equity_curve": [...],
  "trades": [...]
}

Paper Trading

agenttrader paper start ./strategy.py --json
agenttrader paper start ./strategy.py --cash 5000 --json
agenttrader paper start ./strategy.py --no-daemon --json   # blocking, for testing
agenttrader paper list --json
agenttrader paper status <portfolio_id> --json
agenttrader paper compare <portfolio_id_1> <portfolio_id_2> --json
agenttrader paper compare --all --json
agenttrader paper stop <portfolio_id> --json
agenttrader paper stop --all --json

Hot-reload: edit strategy.py while a paper trade is running — the daemon detects the change and reloads automatically. Portfolio state is preserved. No restart needed. paper status shows reload_count to confirm it happened.

paper compare computes side-by-side stats per portfolio from existing SQLite tables (paper_portfolios, positions, trades): portfolio value, unrealized PnL, win rate, avg PnL per sell trade, open positions, and reload count.

Experiments

agenttrader experiments log <backtest_run_id> --note "baseline" --tags "politics,mean-reversion" --json
agenttrader experiments log --portfolio <portfolio_id> --note "live run snapshot" --json
agenttrader experiments list --json
agenttrader experiments note <experiment_id> "updated note" --json
agenttrader experiments show <experiment_id> --json
agenttrader experiments compare <exp_id_1> <exp_id_2> --json

Experiments are persisted in ~/.agenttrader/experiments.json and are sorted newest-first in experiments list.

Dashboard

agenttrader dashboard             # http://localhost:8080
agenttrader dashboard --port 9090

Read-only local dashboard showing active paper trades, positions, trade history, strategy logs, and backtest results with equity curves.

Dashboard routes include:

• #/ overview
• #/paper paper portfolios
• #/compare side-by-side stats for all running paper portfolios
• #/backtests backtest runs
• #/markets cached markets

Maintenance

agenttrader prune --older-than 90d --dry-run --json
agenttrader prune --older-than 90d --json

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Local Storage

~/.agenttrader/
├── config.yaml        # scheduler and sync preferences
├── db.sqlite          # markets, backtests, positions, trade ledger
├── experiments.json   # experiment memory/log for strategy iterations
└── orderbooks/        # compressed orderbook snapshots by market/day

db.sqlite is a standard SQLite file. Agents can query it directly with SQL for custom analysis — for example, SELECT * FROM markets WHERE volume > 10000 ORDER BY volume DESC.

PMXT market-data calls are unauthenticated; no API key is required for sync, backtest, or paper trading workflows.

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Troubleshooting

Problem	Fix
agenttrader: command not found	Activate your virtual environment: source .venv/bin/activate
Not initialized	agenttrader init
Market not in cache	agenttrader sync ...
Strategy validation errors	agenttrader validate ./strategy.py --json — read errors array
Backtest has no trades	Date range has no price movement — try wider range or sync more markets
Dashboard shows blank	Ensure agenttrader dashboard is running and open http://127.0.0.1:8080; check command logs for startup errors
MCP not connecting	Verify agenttrader mcp runs without error; check .claude/mcp.json path

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Development

git clone https://github.com/yourname/agenttrader
cd agenttrader
python -m venv .venv && source .venv/bin/activate
pip install -e ".[dev]"

ruff check agenttrader tests
python -m compileall agenttrader tests

# Integration tests
python tests/integration/test_full_workflow.py

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License

MIT