Backtest crypto
Up/Down markets
in minutes.
The best API for Polymarket crypto Up/Down markets. Pull sub-second snapshots, replay full-depth orderbooks, and stress-test trading strategies across BTC, ETH, SOL & XRP — whether you're a seasoned quant or vibecoding your first trading bot.
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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 SLA · 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 & XRP. 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. The TypeScript SDK has full types, 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
“Was scraping Polymarket manually for weeks. Switched to PolyTest and had 3 months of BTC Up/Down data in my pipeline within an hour. Wish I found this sooner.”
Alex C.
Quant trader
“The orderbook depth data is legit — most APIs only give you mid price. Being able to replay the full book on 5-min markets completely changed how I test my bots.”
Priya M.
Algo developer
“Told Cursor (and could've used Claude Code, OpenClaw, or Codex) to build me a Polymarket trading bot and pointed it at the PolyTest SDK. Had a working backtester with real orderbook data running in one afternoon. The TypeScript types are chef's kiss.”
Marcus D.
Vibecoder / bot builder
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.