Over the last week I've received quite a few e-mails from app developers, comic shops, and other businesses that want to use the Metron API in their products. Most of them ask the same questions: whether commercial use is allowed, whether one account can serve many users, how to handle attribution, and what the situation is with cover images. Here are the answers in one place.
September brought a redesigned pull list built around upcoming releases, new fields and a cover_date_range filter in the API, and fixes for stale API cache entries, Redis stalls that caused API 500s, and missing Retry-After headers on some 429 responses. Mokkari 4.8.0 adds optional rate-limit pacing and connection pooling. If you donate on Open Collective, please don't contribute as Incognito, because Metron can't link an Incognito contribution to your account. Here's the full rundown.
During August, Metron added its first internationalization support — a fully translatable UI with an Italian pilot translation, plus data model changes to support non-USD, non-English comics — alongside Redis-backed caching for the API's read endpoints, an average series rating with a fractional star display, and four new series genres. On the tooling side, Trok had its first public release, a new .NET library for reading and writing MetronInfo.xml. Here's everything that landed, plus the usual bug fixes and quality-of-life improvements.
July brought a new 5-star issue rating system, the ability to chain reading lists into a larger reading order, alternative series names, a name-search performance fix, and a couple of handy API additions. We also shipped three things big enough to get their own posts this month: supporter-based API rate limit tiers, MetronInfo v1.1, and token-based API authentication. Here's everything else that landed.
Up to now, the only way to authenticate against the Metron API was HTTP Basic Auth with your account username and password — meaning every script or third-party tool you connected got a copy of your actual login credentials. Today that changes: you can now generate revocable API tokens and use them instead, without giving up Basic Auth.
A quick follow-up to the v1.0 announcement from two years ago: MetronInfo v1.1 is out, adding two new optional elements that came out of feedback since the initial release.
Back when we added Open Collective support in December 2024, I mentioned that a paid tier for a higher API rate limit wasn't something I was planning on — but that it might be worth revisiting someday if there was enough demand. Then in March we had to cut the daily limit from 10,000 to 5,000 requests due to server load, with a promise to look at restoring it if donations picked up. Well, someday is here: donors to the project now automatically get an elevated daily API rate limit, no paid subscription plan required — just a donation through Open Collective.
June was a busy month for Metron. We shipped a major site UI refresh, a round of reading list improvements, several usability wins across issue and series pages, a new timeline page, account deletion support, and a handful of bug fixes — plus some news from third-party developers building on the Metron API. Here's a rundown of everything that landed.
Here's a summary of everything that landed in Metron since the beginning of May 2026.
Here's a summary of everything that landed in Metron since the beginning of April 2026.