Backtest crypto
Up/Down markets
in minutes.
PolyTest is a Polymarket backtesting API that lets traders replay historical orderbooks and test trading strategies on crypto prediction markets. Pull sub-second snapshots across BTC, ETH & SOL — with XRP, DOGE & BNB coming soon.
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Why traders & builders choose PolyTest
The numbers that matter
Here's exactly what you get
Historical Depth
snapshots indexed & growing
p50 response · p99 < 120ms
uptime · last 60 days
full bid/ask per snapshot
Coins
Timeframes
Every Up/Down market, every expiration. Zero data gaps.
Ready to see the data yourself?
Free tier · No credit card · Works with Cursor, Claude Code, OpenClaw, Codex, v0, and any tool you build with
Get started in minutes
How it works
Three steps. Real data. No setup headaches.
Pick a market
Browse Up/Down markets across BTC, ETH & SOL. Filter by timeframe.
One API call
Fetch historical snapshots with a single request. Full orderbook depth, bid/ask, mid price, volume — all timestamped to the millisecond. Clean JSON responses, so Cursor, Claude Code, OpenClaw, Codex, and other AI tools nail the integration first try.
Backtest & build
Replay price action, test entry/exit signals, or vibecode a full trading bot. Whether you're writing strategies by hand or letting AI help — all the data, zero guesswork.
Use cases
Built for builders who move fast
From first-time prediction market traders to production quant systems.
Traders & New Enthusiasts
Whether you're a seasoned quant or just getting into Polymarket prediction trading — backtest entry/exit signals on real Up/Down crypto markets. Pull historical bid/ask data, replay orderbooks, and measure your edge before placing a single trade.
From the community
What developers are saying
“i was writing my own scraper for polymarket and it kept breaking every other day. found polytest, had month of BTC data flowing in like 40 minutes. kinda mad i wasted so much time before lol”
Alex C.
Quant trader
“finally an api that actually gives you the full book. everywhere else its just mid price which is useless if you want to know what your fills would actually look like. 8 levels deep is more than enough for what i need”
Priya M.
Algo developer
“not gonna lie i have no idea what im doing but i pointed cursor at the polytest api docs and it just worked? had a backtester running same day. the json responses are clean so the ai doesnt hallucinate random fields”
Marcus D.
Building my first trading bot
FAQ
Questions you're probably asking
If yours isn't here, just ask us.
Ready to build?
Start with the free tier — no credit card required. Pull BTC Up/Down data in minutes, whether you're a first-time trader or shipping a production bot.