"Best prediction market bot" is not one question. A bot that mirrors a Polymarket wallet from Telegram, a bot that runs a plain-English strategy on Kalshi, and a bot that copies a trader with a public record after proving the copy on paper are three different products for three different people. This roundup sorts them by the job. Every claim about another product comes from that vendor's own site; Rivo writes this page and is one of the products.
If you want to copy a trader with a record you can inspect
Rivo. Every tracked Kalshi and Polymarket trader has a profile built from observed trades, scored on settlement. The bot builder takes a trader from that record, replays copying them at your size, runs the bot on paper, and promotes it to live on Kalshi, Polymarket US or Gemini through your own account. No fee per trade. On Polymarket Global a bot stops at alerts and paper because orders there are browser-signed. The same builder runs two more kinds of bot: a signal that trades incoming activity matching your filters, and a market bot that watches one market's price and records a paper trade each time it hits your rule, including the 15 minute markets that reopen all day.
Polycopy. A web app for Polymarket with a copy score that discounts fees and slippage, trader bots under your signals, and paper strategy bots on the free tier. A $30 premium tier and a flat 0.5% per trade.
If you want the fastest first copy on Polymarket, from your phone
Kreo, PolyCop, PolyGun. Telegram bots that operate a wallet for you and mirror an address in real time. Kreo covers Polymarket and Kalshi with a leaderboard and stated risk limits, and shows its fees inside the bot. PolyCop is Polymarket only at 0.5% per filled trade with sniper orders and condition triggers. PolyGun is Polymarket only at 1% per trade with multi-chain deposits. None describes a backtest or a paper mode. The copy bot comparison has the full table.
If you want to describe a strategy in plain English
Turbine. Chat with an AI, it turns the description into a strategy, backtest it against history, deploy it hosted. Examples lean on technical signals such as EMA and VWAP. Tiers from $19 a month for one bot to $199 for five, by deploys per week.
Bot for Kalshi. Kalshi only, a plain-English visual builder with paper testing and hosted execution on your own key, $99 a month for up to ten live bots. Focused on Bitcoin and sports markets today.
Neither copies a specific trader, and both rely on signals whose value on a thin binary market is an open question. The bot builder comparison sets them beside Rivo.
If you do not want a bot at all
Kairos. A terminal aggregating Kalshi, Polymarket and Predict.fun into one book with advanced orders and no platform fee. Its argument is that a bot runs one strategy without judgement and a terminal amplifies yours. For a discretionary trader that is the right product; for anyone who wants a signal to run overnight it is not.
If you want to write it yourself
Kalshi's API is public and Polymarket's CLOB is documented, and a Python loop against either is a weekend's work for someone who codes. You then own hosting, key rotation, risk controls and the trader tracking, which is the expensive part. Rivo's REST API and MCP server expose the same bots to code and to AI agents with the guardrails already built, which is the middle path.
How to choose
- Decide what the bot reacts to first: a person, a signal, a price, or your own hand.
- Ask whether you can see a record before you spend, and whether the bot runs on paper first.
- Ask who holds the wallet, and what the product can do with it.
- Add up the fee per trade at your volume before you compare subscriptions.
Whichever you pick, read paper trading a bot before going live first. The failure modes are the same on every product.