Access MISO Data Exchange to query day-ahead LMP market reports via the JSON API

Verified steps

1. Create a profile on the MISO public website at misoenergy.org and register for MISO Data Exchange access; Data Exchange account creation is required to use the API, though the underlying market report data is publicly available.
2. Authenticate to the MISO Data Exchange API using the credentials obtained during registration; the API returns market report data in JSON format — as of December 12, 2025, MISO Data Exchange reports are available in JSON format only (CSV and XML formats have been discontinued for new feeds).
3. Query available reports using the Data Exchange catalog endpoint to discover report IDs and update schedules; day-ahead LMP reports include the Day-Ahead Energy and Operating Reserve Market (DA_ExAnte_LMP) and the Day-Ahead Market Clearing results.
4. Request a specific report via the Data Exchange API endpoint with the report ID and date parameters; parse the JSON response which includes market node identifiers, LMP values (in $/MWh), loss component, and congestion component for each settlement location.
5. Handle MISO's data refresh schedule: Data Exchange data is refreshed once per day; if the market date equals the current date, new data may not yet be available depending on the time of day — implement a retry with a backoff schedule aligned to MISO's known publication times.
6. For real-time operational data (5-minute intervals), use the MISO Real-Time Data API at misoenergy.org/markets-and-operations/rtdataapis/ which provides WebSocket-based streaming of real-time grid data separate from the batch Data Exchange.