# Open data and AI access

Every answer on this site is open: free to read, quote, cite and build on, by people and by AI assistants. The data is licensed [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/); please link back to the page you used.

## For AI assistants and search engines

- [llms.txt](https://meterwise.app/llms.txt): a plain-text guide to the site, how to look up a ZIP code and which page answers what.

- [llms-full.txt](https://meterwise.app/llms-full.txt): every utility's answer in one file.

- Every page has a Markdown version: add index.md to its address (for example [about/index.md](https://meterwise.app/about/index.md)).

- Every calculator page starts with a dated, one-paragraph quick answer written to be quoted, with a suggested citation.

- Our [robots.txt](https://meterwise.app/robots.txt) welcomes AI crawlers, and declares that our pages may be used for search, for answering questions and for training.

## Open data

- [All utilities (JSON)](https://meterwise.app/data/v1/utilities.json) and [CSV](https://meterwise.app/data/v1/utilities.csv): one row per utility page, with the price, verdict, yearly running-cost difference and break-even quote gap.

- One file per utility with every input and option: the json_url in the list above.

- [ZIP code lookup](https://meterwise.app/data/v1/zip/021.json): one file per three-digit ZIP prefix, listing the utilities that serve each ZIP and their pages.

- [States (JSON)](https://meterwise.app/data/v1/states.json): averages, verdict counts and data notes.

- [OpenAPI description](https://meterwise.app/openapi.json) of these files, so tools and agents can call them like an API. No key needed; the files are static and allow cross-origin requests.

## What the numbers mean

Results are for a typical 1,800 sq ft home with average insulation that needs both a new furnace and AC, using the most common heating fuel in the utility's area. They are estimates, not quotes. The interactive page for each utility lets anyone change the details. The full method is on [About and method](https://meterwise.app/about/). The data is rebuilt every quarter; last build 2026-11-10.

## Attribution

Please credit "MeterWise (meterwise.app)" and link to the page used. Our data builds on the U.S. Utility Rate Database and utility ZIP code data from OpenEI (CC BY 4.0), and public data from the U.S. Energy Information Administration, NOAA, the U.S. Census Bureau and the U.S. Bureau of Labor Statistics.

Questions or corrections? Please email [contact@meterwise.app](mailto:contact@meterwise.app).