Support the project
8,677 codes, free to read, free to download, no sign-up and no paywall. Keeping it that way takes a yearly rebuild against the new CMS release, and the hosting bill in between.
What money changes
Nothing gets locked. The 2026files stay free, and so will next year's. Support pays for hosting, for the work of reconciling each CMS quarterly update, and for keeping advertising light rather than aggressive.
Ways to help that cost nothing
- Report a wrong code — or anything that disagrees with the CMS file. This is worth more than a donation.
- Send a pull request. The contributing guide covers setup, and billing experience counts as much as code.
- Star the repository — it is how other people find the project.
- Link to a code page instead of copying it, so the corrections reach your readers too.
- Tell a biller or a developer. Most people still do not know the data is free.
Using it in your own work
You do not owe anything for that. The bulk downloads and the MCP server are there to be used, and the code is MIT licensed. If the data saved you a week of work, a tip or a link back is a kind way to say so.