Your data layer is a scraper
wearing an API's clothes.
yfinance is the free-data workhorse — built on unofficial Yahoo endpoints that broke with the February 2025 redesign and have thrown YFRateLimitError waves into mid-2026. EventTrader's API is the boring alternative: documented endpoints, an issued key, published limits, and Tuatara signals you can't scrape anywhere.
Explore before you commit
Tuatara signal endpoints, market data and docs are open to read-only exploration before you fund anything.
Read the API docs →Documented, honest limits
100 requests/min authenticated, 20/min unauthenticated — published in the docs, not discovered in production.
Read the API docs →MCP + SDK included
An MCP server (pip install cymetica-eventtrader-mcp) and SDK ship alongside the REST docs.
Why people look beyond yfinance
- YFRateLimitError waves documented in GitHub issues #2422/#2431 (2025) with recurrences into 2026
- February 2025 Yahoo redesign broke schema and quotas overnight
- Zero stability guarantee — Yahoo owes this library nothing
yfinance is great until it isn't; keep it for research. For signals and markets with a contract behind them, keys are free at /register.
What you'd actually be trading here
EventTrader is a prediction exchange: perpetual prediction markets on crypto, stocks and macro moves with no expiry, live central-limit order books, event markets on real-world outcomes, and a marketplace of trading bots you can clone instead of coding. Position risk is capped at what you put in — no liquidation engine, no margin calls. Server-side alerts and free webhook auto-execution come with every account.
- Free means free. No card required. Nothing auto-converts into a paid plan.
- We are not a market-data vendor. The API serves EventTrader's markets and signals — generous and documented, but not a general data feed.
- No predictions sold. Markets are markets; we make no performance claims.
- Leave in one click. Withdraw on-chain any time, with a tx hash you can verify.
Coming from a different platform? Browse the full directory of tools and communities we build for →