Every vendor's free tier
is a different kind of almost.
The 2026 field: Polygon (fast, ~$100+/mo, no real free real-time), Finnhub (60 calls/min free — the generous one), Twelve Data (800/day free, REST-only), EODHD (20 calls/day free), Tiingo (flat-rate, mid-2026 migration wobbles). If your workload is signals and tradable markets rather than bulk OHLCV, EventTrader's API — 100/min authenticated, Tuatara signals, live books — is free with the account.
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.
The honest 2026 comparison
- Polygon.io: entry ~$100+/mo; no true free real-time tier
- EODHD: 20 calls/day free, and intraday/news cost 5–10 calls each
- Twelve Data: REST-only (no WebSocket); 200–500ms responses
- Tiingo: solid flat-rate model; August 2026 datacenter migration caused an outage
Finnhub and Twelve Data are genuinely good free tiers — use them for bulk data. Our API's job is different: signals and markets you can trade.
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.
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