Weather Bots, Whale Trackers, and a CCXT Rival Emerge

GitHub Sweep — 2026-06-21

Lead Story: PMXT Is Building the CCXT of Prediction Markets

The most strategically significant repository in today's feed is **pmxt-dev/pmxt** (1,909 stars, 225 forks), which describes itself explicitly as "CCXT for prediction markets" — a unified trading API spanning Polymarket, Kalshi, and additional venues. Created in January 2026 and updated today, the project has compounded stars at a rate that suggests genuine developer adoption rather than manufactured engagement. For serious operators, this matters: when abstraction layers this polished exist, the barrier to deploying multi-venue bots collapses. Expect arbitrage pressure across Polymarket/Kalshi overlapping markets to intensify materially in the coming months if this library reaches the adoption CCXT achieved in crypto.

Weather Markets Are Now a Bot Vertical

Two independent repositories target Polymarket's temperature and weather forecast markets specifically. **BallesJr/polymarket-weather-edge** combines live METAR airport observations with Open-Meteo forecast data inside a Gaussian probability model, shorting the NO side of overpriced temperature markets in paper-trading mode. **JosselinPerret/weather-polymarket** takes a simpler approach but shares the same thesis. The convergence of two separate developers on weather markets in the same reporting period suggests either a known pricing inefficiency is circulating in quant communities, or recent Polymarket weather market launches have drawn attention. Operators holding YES positions in temperature markets should verify their implied probabilities against METAR baselines before the next settlement cycle.

Sports Arbitrage: NHL Called Out by Name

**LuciferForge/polymarket-odds-scanner** makes a specific, falsifiable claim worth noting: NHL markets on Polymarket are systematically overpriced by 10–17% versus ESPN sportsbook odds, with the author reporting a 100% win rate on signals above 5% edge. The repository is small (18KB) and lightly starred, but the specificity of the claim — a named sport, a named external data source, a quantified edge range — makes it worth independent verification. If accurate, it represents the kind of structural mispricing that persists only until enough capital finds it.

Cross-Platform Arbitrage Infrastructure Proliferating

Three repos today address cross-market arbitrage spanning Polymarket, Kalshi, and PredictIt: **matthewnyc2/arbitrage** (NegRisk multi-outcome scanner, 60 passing tests, production Python asyncio), **pjmerica/pred-arbitrage** (three-venue scanner), and **nayrbryanGaming/arbiter** (political markets, fractional Kelly sizing, paper-trading default). The matthewnyc2 project is technically the most mature of the three based on its description, with explicit test coverage and a browser demo. The proliferation of NegRisk arbitrage scanners in particular signals that Polymarket's multi-outcome market structure is now well understood by the broader developer community.

Whale Copy-Trading Tools

Two whale-tracking projects appeared today: **adibfarah569/PolyTrace** (created today, demo mode) and **EricSpencer00/polymarket-whale-tracker** (read-only signal emission). Both are early-stage. PolyTrace's same-day creation and update timestamp warrants skepticism about production readiness, but the category itself confirms that on-chain wallet analysis for copy-trading is becoming a standard approach. Operators running large positions should be aware that their trading patterns are increasingly legible to automated trackers.

Security Note

**quipmnxailcrrgky/tradingbot** (98 stars, 60 forks) carries the highest social proof in today's feed after pmxt, but its anonymous username, generic description ("Easy setup and creation of a bot"), and disproportionate star-to-fork ratio relative to its apparent maturity are consistent with patterns seen in credential-harvesting or API-key-stealing repositories. Do not run unreviewed code from this project against funded wallets.

Bottom Line

The open-source tooling layer around Polymarket is now broad enough that every major market category — weather, sports, crypto, political, cross-venue — has dedicated bot infrastructure actively maintained. Edges that existed twelve months ago due to information asymmetry are being systematically closed by code. The operators who will retain advantage are those who move upstream: better data sources, faster resolution feeds, or proprietary models that commodity tooling cannot replicate.