Bot directory / Category
Prediction market bots: 13 bots compared
Every prediction market bots entry in the BotOrNot directory, with sourced pricing, markets, custody model and a rule-based report card.
Report cards in this category: Closed 2 · Caution 3 · Clear record 8. How report cards work.
Prediction markets guide: who regulates what, and which bots exist →
| Bot | Report card | Pricing | How it touches your money |
|---|---|---|---|
| CloddsBot Open-source AI trading agent covering prediction markets and crypto, with copy trading, arbitrage detection and DCA bots. | Clear record | Free (open source). | Self-hosted: you run the software and your keys stay on your machine. |
| Gemini Predictions API Gemini's prediction markets, with an official Prediction Markets REST API and WebSocket feeds for automated trading. | Caution | Not verified yet | Trades through your account on a regulated exchange via its API. |
| Kalshi AI Trading Bot Open-source toolkit for building and measuring LLM-driven strategies on Kalshi, with an API client, dashboard and MCP server. | Clear record | Free (open source). | Self-hosted: you run the software and your keys stay on your machine. |
| Kalshi API Kalshi's official exchange API (REST, WebSocket and FIX) for automated trading of event contracts, with a demo environment. | Caution | Not verified yet | Trades through your account on a regulated exchange via its API. |
| Nothing Ever Happens (Polymarket bot) Small open-source Python bot that buys “No” on standalone non-sports Polymarket markets. Its README says it is for entertainment only. | Clear record | Free (public domain). | Self-hosted: you run the software and your keys stay on your machine. |
| OctoBot Prediction Market Free Polymarket bot built on OctoBot: copy trading of Polymarket profiles, arbitrage strategies and paper trading. Kalshi support is listed as upcoming. | Clear record | Free (open source). | Self-hosted: you run the software and your keys stay on your machine. |
| Oracle3 prediction market agent Open-source trading engine and MCP server for prediction markets that looks for fee-adjusted opportunities. | Clear record | Free (open source). | Self-hosted: you run the software and your keys stay on your machine. |
| pmxt Open-source unified API (“CCXT for prediction markets”) for trading on Polymarket, Kalshi and others; a building block for bots. | Clear record | Free (open source). | Self-hosted: you run the software and your keys stay on your machine. |
| poly-maker Open-source maker-only market-making bot for the Polymarket order book. Its README warns that market making can lose money. | Clear record | Free (open source). | Self-hosted: you run the software and your keys stay on your machine. |
| Polymarket Agents Polymarket's open-source framework for AI agents that trade on Polymarket. The repository is archived. | Closed | Free (open source). | Self-hosted: you run the software and your keys stay on your machine. |
| Polymarket API (CLOB) Polymarket's official developer APIs and SDKs for market data and placing orders on its order book. | Caution | Taker fees on some markets, set by the protocol (formula fee = C × feeRate × p × (1 − p)); makers pay no fees; geopolitical and world-events markets are fee-free. | Self-hosted: you run the software and your keys stay on your machine. |
| Polymarket py-clob-client Polymarket's official Python client for its order book, used by many bots. The repository is archived; Polymarket's docs now point to newer SDKs. | Closed | Free (open source). | Self-hosted: you run the software and your keys stay on your machine. |
| Prediction Markets Trading Bot Toolkits Open-source Rust bots for prediction markets (Polymarket, Kalshi, Limitless), including copy trading. | Clear record | Free (open source). | Self-hosted: you run the software and your keys stay on your machine. |
Comparisons
- Kalshi API vs Polymarket API (CLOB)
- Polymarket API (CLOB) vs Gemini Predictions API
- poly-maker vs OctoBot Prediction Market
- Kalshi AI Trading Bot vs Polymarket Agents
- pmxt vs CloddsBot
Alphabetical, and the order can’t be bought. Paid spots are labeled “Ad”, sit outside the table, and never change a report card. Not investment advice.