Mostly Right provides fundamental data access for prediction markets, focusing on delivering live and historical weather information as well as prediction market data. The platform addresses the need for research-grade, real-world data that can be used to analyze and settle prediction market contracts, particularly those tied to weather outcomes. It offers real-time METAR observations and multi-model weather forecasts, as well as access to decades of climate and station archive data, including sources such as GHCNh, NOAA, NWS, and IEM. The platform also supports deterministic settlement backtests, ensuring that backtesting does not inadvertently use data from the future.
Designed for quantitative analysts, machine learning pipelines, and AI agents, Mostly Right enables users to retrieve data relevant to specific prediction market contracts by mapping them to their settlement stations using ICAO codes. Its research() function returns schema-versioned tables containing all relevant data points, including observed highs, model forecasts, and contract settlement values, with every response carrying a stable schema URI and a source identity for transparency and reliability. This approach ensures that data used for training or inference is consistent and verifiable.
The service is accessible through Python and TypeScript SDKs, allowing integration into various workflows. There is also a free Chrome extension that overlays model consensus and live data directly onto prediction market pages on platforms like Kalshi and Polymarket, without requiring an account or API key. Data can be cached locally in formats such as Parquet or JSON, supporting reproducibility and efficient re-runs. The platform emphasizes direct calls to public APIs from the user's runtime, with optional local caching, and supports browser integration for immediate access to live data where users trade.
Mostly Right is positioned as a research-grade data access framework for prediction markets and weather-related analysis, with a focus on providing transparent, schema-stable, and locally cacheable data streams for advanced analytics and automated agents.
mostlyrightmd-weather is a Frameworks & SDKs product. It focuses on providing direct, programmatic access to live and historical weather data for Python-based ML and automation workflows. It is built as an open-source project for python developers, data scientists, and ML engineers needing weather data. mostlyrightmd-weather is open source under the MIT license. It runs on the web and the command line.
mostlyrightmd builds and maintains mostlyrightmd-weather, and the product first shipped in 2026. Development happens publicly on GitHub with 855 commits in the last 90 days. Key capabilities include Live METAR data, ASOS archive access, and historical weather observations.
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