Rainbow Alternatives (2026)

The Aggregation Layer for Prediction Markets

Macro-release calendar (CPI, FOMC, PCE, NFP) paired with live Polymarket prices and surrounding news context. By AlphAI. Not affiliated with Polymarket.

Free, code-only prediction-market bot challenge from Builderr and YeNo. Build a bot for YeNo BTC five-minute Up/Down markets and submit a frozen version for a 24-hour paper run with $10 in simulated cash. Qualify by completing $1,000 in executed BUY-plus-SELL volume while flat; each BUY is capped at $5 including fees. $500 first prize. No YeNo account, deposit, trading key, or real-money trades are required. Full rules and starter kit: https://builderr.ai/challenges/yeno-volume-bots

Cerious Systems

Professional & institutional trading platform for event contract, futures and spot market. Kalshi, CME, Coinbase, Polymarket (Lighter in dev). Unified view of orders, fills, and p&l. multi exchange, multi asset spreader. C++ modular design with Kalshi server based in o

Racinglines

We are early stage but plan to launch an alpha version this week. (This means web abb feature-complete, `racinglines` on pypi, MCP tool working.) All are currently free/ open-source at least thru end of this year. We are exploring pricing for next year but will always offer some free tier. I am looking for feedback right now on how this platform can help me/ what I might need to improve/ change to fulfill selection criteria. Thanks. gh: github.com/lalligagger/racinglines-public