Mostly Right provides fundamental real-world data specifically for prediction markets, focusing on delivering live and historical weather and climate datasets, as well as prediction market data. The platform aggregates data from public sources such as NOAA, NWS, IEM, and GHCNh, supporting both live real-time METAR observations and multi-model weather forecasts. It also offers access to climate archives, ASOS records, and deterministic settlement backtests, all accessible through a schema-versioned API. Data is mapped precisely to the settlement station relevant to each market contract, ensuring that the information reflects exactly what a contract settles on, with US and international stations supported and all data tied to its reporting code and measurement units.
The tool is designed for users needing research-grade data for quantitative analysis, machine learning pipelines, and AI agents. It provides a Python SDK and a TypeScript SDK, both allowing users to retrieve live or historical data with a single research() call. Data fetched is cached locally on first retrieval, preventing drift in repeated backtests and ensuring that no future data is inadvertently used in historical analysis. The schema for every response is stable and versioned, with explicit source attribution, so any mismatch between training and inference is detected and flagged.
For direct integration with prediction markets, Mostly Right offers a free Chrome extension that overlays model consensus and live data directly onto contract pages on platforms such as Kalshi and Polymarket. This extension requires no account or API key and enables users to see the live numbers, underlying records, and model calls relevant to the contract they are viewing, all within the market interface. The platform is currently in private beta, with early access available by request, and coverage is expanding to include financial datasets such as SEC EDGAR filings and Federal Reserve series in the future.
Mostly Right operates as an infrastructure layer for prediction markets, providing the real-world data that influences market pricing and settlement. Its delivery includes a streaming-friendly read API, SDKs for Python and TypeScript, and browser integration via a Chrome extension.
Mostly Right sits in PulseGate's Infrastructure & Backend category. It provides normalized, authoritative real-world data for prediction markets and research. Mostly Right is an open-source project aimed at prediction market researchers. The project is open source (MIT). The product ships for the web, the command line, and embeddable surfaces.
It is developed by Mostly Right, and the product first shipped in 2026. Among its 5 catalogued features are live data access, historical data, and Streaming API. Mostly Right is currently in beta.
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